{"parentUuid":null,"isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":"You are researching the absolute cutting edge of AI-powered coding infrastructure in February 2026 for a system called Genesis. The goal is to find game-changing capability upgrades that Genesis should implement.\n\nGenesis currently has:\n- Claude Opus 4.6 as orchestrator (200K context, 128K output)\n- 13 MCP servers (GHL 269 tools, Playwright browser, voice bridge, memory, etc.)\n- Agent Teams (experimental)\n- Git worktrees for parallel development\n- n8n automation (13 workflows)\n- Telnyx AI voice assistants\n- 6-tier memory stack (Redis → PostgreSQL → Qdrant → KG JSONL → Supermemory → FalkorDB planned)\n- DeepSeek-R1, Kimi K2.5, MiniMax M2.5, Gemini 2.5 Flash, Jules Pro for code execution\n- Knowledge Graph with 1000+ entities and 500+ axioms\n- RLM (Recursive Language Models) bloodstream for memory ingestion\n\nResearch these specific areas and give CONCRETE recommendations with implementation paths:\n\n1. **Persistent tmux/screen agent architectures** — How are top teams running persistent AI coding agents that survive session restarts? Best practices for tmux multiplexing with AI agents. What's the optimal layout for 4 concurrent persistent agents?\n\n2. **Claude Code power features in 2026** — What new features has Claude Code shipped recently? New MCP capabilities? New hooks? Agent SDK improvements? Computer use improvements?\n\n3. **Multi-agent coordination patterns** — What are the latest patterns for coordinating multiple Claude Code instances? File-based handoff vs socket vs shared memory? How do IndyDevDan, Riley Brown, or other power users coordinate agents?\n\n4. **Context window optimization** — With 200K-1M context, what are the best strategies for context management? Prompt caching? Retrieval-augmented generation within Claude Code sessions?\n\n5. **Automated testing + CI/CD with AI agents** — What are the latest patterns for AI agents running tests, reviewing PRs, and managing deployments autonomously?\n\n6. **MCP server ecosystem 2026** — What new MCP servers have emerged? Database MCPs, monitoring MCPs, deployment MCPs? What's missing from Genesis's 13 servers?\n\n7. **Code generation acceleration** — Aider, Cursor, Windsurf, Cline, Continue — what features do competitors have that Claude Code should leverage? Any Claude Code plugins/extensions worth adding?\n\n8. **Self-healing infrastructure** — Patterns for AI agents that monitor their own health, restart failed processes, and self-repair. How to make Genesis truly autonomous.\n\nReturn CONCRETE, ACTIONABLE recommendations with estimated implementation effort (hours) and impact (1-10). No vague suggestions. Every recommendation must be something we can build TODAY."},"uuid":"b2c62a5c-c01e-46be-b9c6-82e28701f965","timestamp":"2026-02-23T18:20:33.261Z"} {"parentUuid":"b2c62a5c-c01e-46be-b9c6-82e28701f965","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","message":{"model":"claude-opus-4-6","id":"msg_01HdtVPFu9SnGpPFP58KPJm3","type":"message","role":"assistant","content":[{"type":"text","text":"\n\nI'll conduct a thorough research sweep across all 8 areas. Let me search for the latest information in parallel."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":89567,"cache_read_input_tokens":0,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":89567},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CYRTrnqr7SCfhTE5CjPKG","type":"assistant","uuid":"44163dfd-c948-4b82-9e55-20e3fdda3569","timestamp":"2026-02-23T18:20:41.036Z"} {"parentUuid":"44163dfd-c948-4b82-9e55-20e3fdda3569","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","message":{"model":"claude-opus-4-6","id":"msg_01HdtVPFu9SnGpPFP58KPJm3","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01CYedwJAbZTbwdznd7fsR6j","name":"WebSearch","input":{"query":"persistent tmux AI coding agents architecture 2026 best practices"},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":89567,"cache_read_input_tokens":0,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":89567},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CYRTrnqr7SCfhTE5CjPKG","type":"assistant","uuid":"d62ba311-9ae5-40a4-8d4a-04c63fdd280e","timestamp":"2026-02-23T18:20:41.674Z"} {"parentUuid":"d62ba311-9ae5-40a4-8d4a-04c63fdd280e","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PreToolUse","hookName":"PreToolUse:WebSearch","command":"python3 ${CLAUDE_PLUGIN_ROOT}/hooks/pretooluse.py"},"toolUseID":"toolu_01CYedwJAbZTbwdznd7fsR6j","parentToolUseID":"toolu_01CYedwJAbZTbwdznd7fsR6j","uuid":"926364df-d3b4-4346-9423-1ab64a8a38bc","timestamp":"2026-02-23T18:20:41.677Z"} {"parentUuid":"d62ba311-9ae5-40a4-8d4a-04c63fdd280e","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"type":"tool_result","content":"Permission to use WebSearch has been denied. 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{"parentUuid":"605c15a3-9bef-49fb-ad66-6f263d343a54","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01DgwmZ3wtpx827NJZ52Eedj","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# Claude Code overview\n\n> Claude Code is an agentic coding tool that reads your codebase, edits files, runs commands, and integrates with your development tools. Available in your terminal, IDE, desktop app, and browser.\n\nClaude Code is an AI-powered coding assistant that helps you build features, fix bugs, and automate development tasks. It understands your entire codebase and can work across multiple files and tools to get things done.\n\n## Get started\n\nChoose your environment to get started. Most surfaces require a [Claude subscription](https://claude.com/pricing) or [Anthropic Console](https://console.anthropic.com/) account. The Terminal CLI and VS Code also support [third-party providers](/en/third-party-integrations).\n\n\n \n The full-featured CLI for working with Claude Code directly in your terminal. Edit files, run commands, and manage your entire project from the command line.\n\n To install Claude Code, use one of the following methods:\n\n \n \n **macOS, Linux, WSL:**\n\n ```bash theme={null}\n curl -fsSL https://claude.ai/install.sh | bash\n ```\n\n **Windows PowerShell:**\n\n ```powershell theme={null}\n irm https://claude.ai/install.ps1 | iex\n ```\n\n **Windows CMD:**\n\n ```batch theme={null}\n curl -fsSL https://claude.ai/install.cmd -o install.cmd && install.cmd && del install.cmd\n ```\n\n \n Native installations automatically update in the background to keep you on the latest version.\n \n \n\n \n ```sh theme={null}\n brew install --cask claude-code\n ```\n\n \n Homebrew installations do not auto-update. Run `brew upgrade claude-code` periodically to get the latest features and security fixes.\n \n \n\n \n ```powershell theme={null}\n winget install Anthropic.ClaudeCode\n ```\n\n \n WinGet installations do not auto-update. Run `winget upgrade Anthropic.ClaudeCode` periodically to get the latest features and security fixes.\n \n \n \n\n Then start Claude Code in any project:\n\n ```bash theme={null}\n cd your-project\n claude\n ```\n\n You'll be prompted to log in on first use. That's it! [Continue with the Quickstart →](/en/quickstart)\n\n \n See [advanced setup](/en/setup) for installation options, manual updates, or uninstallation instructions. Visit [troubleshooting](/en/troubleshooting) if you hit issues.\n \n \n\n \n The VS Code extension provides inline diffs, @-mentions, plan review, and conversation history directly in your editor.\n\n * [Install for VS Code](vscode:extension/anthropic.claude-code)\n * [Install for Cursor](cursor:extension/anthropic.claude-code)\n\n Or search for \"Claude Code\" in the Extensions view (`Cmd+Shift+X` on Mac, `Ctrl+Shift+X` on Windows/Linux). After installing, open the Command Palette (`Cmd+Shift+P` / `Ctrl+Shift+P`), type \"Claude Code\", and select **Open in New Tab**.\n\n [Get started with VS Code →](/en/vs-code#get-started)\n \n\n \n A standalone app for running Claude Code outside your IDE or terminal. Review diffs visually, run multiple sessions side by side, and kick off cloud sessions.\n\n Download and install:\n\n * [macOS](https://claude.ai/api/desktop/darwin/universal/dmg/latest/redirect?utm_source=claude_code\\&utm_medium=docs) (Intel and Apple Silicon)\n * [Windows](https://claude.ai/api/desktop/win32/x64/exe/latest/redirect?utm_source=claude_code\\&utm_medium=docs) (x64)\n * [Windows ARM64](https://claude.ai/api/desktop/win32/arm64/exe/latest/redirect?utm_source=claude_code\\&utm_medium=docs) (remote sessions only)\n\n After installing, launch Claude, sign in, and click the **Code** tab to start coding. A [paid subscription](https://claude.com/pricing) is required.\n\n [Learn more about the desktop app →](/en/desktop-quickstart)\n \n\n \n Run Claude Code in your browser with no local setup. Kick off long-running tasks and check back when they're done, work on repos you don't have locally, or run multiple tasks in parallel. Available on desktop browsers and the Claude iOS app.\n\n Start coding at [claude.ai/code](https://claude.ai/code).\n\n [Get started on the web →](/en/claude-code-on-the-web#getting-started)\n \n\n \n A plugin for IntelliJ IDEA, PyCharm, WebStorm, and other JetBrains IDEs with interactive diff viewing and selection context sharing.\n\n Install the [Claude Code plugin](https://plugins.jetbrains.com/plugin/27310-claude-code-beta-) from the JetBrains Marketplace and restart your IDE.\n\n [Get started with JetBrains →](/en/jetbrains)\n \n\n\n## What you can do\n\nHere are some of the ways you can use Claude Code:\n\n\n \n Claude Code handles the tedious tasks that eat up your day: writing tests for untested code, fixing lint errors across a project, resolving merge conflicts, updating dependencies, and writing release notes.\n\n ```bash theme={null}\n claude \"write tests for the auth module, run them, and fix any failures\"\n ```\n \n\n \n Describe what you want in plain language. Claude Code plans the approach, writes the code across multiple files, and verifies it works.\n\n For bugs, paste an error message or describe the symptom. Claude Code traces the issue through your codebase, identifies the root cause, and implements a fix. See [common workflows](/en/common-workflows) for more examples.\n \n\n \n Claude Code works directly with git. It stages changes, writes commit messages, creates branches, and opens pull requests.\n\n ```bash theme={null}\n claude \"commit my changes with a descriptive message\"\n ```\n\n In CI, you can automate code review and issue triage with [GitHub Actions](/en/github-actions) or [GitLab CI/CD](/en/gitlab-ci-cd).\n \n\n \n The [Model Context Protocol (MCP)](/en/mcp) is an open standard for connecting AI tools to external data sources. With MCP, Claude Code can read your design docs in Google Drive, update tickets in Jira, pull data from Slack, or use your own custom tooling.\n \n\n \n [`CLAUDE.md`](/en/claude-md) is a markdown file you add to your project root that Claude Code reads at the start of every session. Use it to set coding standards, architecture decisions, preferred libraries, and review checklists.\n\n Create [custom slash commands](/en/skills) to package repeatable workflows your team can share, like `/review-pr` or `/deploy-staging`.\n\n [Hooks](/en/hooks) let you run shell commands before or after Claude Code actions, like auto-formatting after every file edit or running lint before a commit.\n \n\n \n Spawn [multiple Claude Code agents](/en/sub-agents) that work on different parts of a task simultaneously. A lead agent coordinates the work, assigns subtasks, and merges results.\n\n For fully custom workflows, the [Agent SDK](https://platform.claude.com/docs/en/agent-sdk/overview) lets you build your own agents powered by Claude Code's tools and capabilities, with full control over orchestration, tool access, and permissions.\n \n\n \n Claude Code is composable and follows the Unix philosophy. Pipe logs into it, run it in CI, or chain it with other tools:\n\n ```bash theme={null}\n # Monitor logs and get alerted\n tail -f app.log | claude -p \"Slack me if you see any anomalies\"\n\n # Automate translations in CI\n claude -p \"translate new strings into French and raise a PR for review\"\n\n # Bulk operations across files\n git diff main --name-only | claude -p \"review these changed files for security issues\"\n ```\n\n See the [CLI reference](/en/cli-reference) for the full set of commands and flags.\n \n\n \n Sessions aren't tied to a single surface. Move work between environments as your context changes:\n\n * Kick off a long-running task on the [web](/en/claude-code-on-the-web) or [iOS app](https://apps.apple.com/app/claude-by-anthropic/id6473753684), then pull it into your terminal with `/teleport`\n * Hand off a terminal session to the [Desktop app](/en/desktop) with `/desktop` for visual diff review\n * Route tasks from team chat: mention `@Claude` in [Slack](/en/slack) with a bug report and get a pull request back\n \n\n\n## Use Claude Code everywhere\n\nEach surface connects to the same underlying Claude Code engine, so your CLAUDE.md files, settings, and MCP servers work across all of them.\n\nBeyond the [Terminal](/en/quickstart), [VS Code](/en/vs-code), [JetBrains](/en/jetbrains), [Desktop](/en/desktop), and [Web](/en/claude-code-on-the-web) environments above, Claude Code integrates with CI/CD, chat, and browser workflows:\n\n| I want to... | Best option |\n| --------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |\n| Start a task locally, continue on mobile | [Web](/en/claude-code-on-the-web) or [Claude iOS app](https://apps.apple.com/app/claude-by-anthropic/id6473753684) |\n| Automate PR reviews and issue triage | [GitHub Actions](/en/github-actions) or [GitLab CI/CD](/en/gitlab-ci-cd) |\n| Route bug reports from Slack to pull requests | [Slack](/en/slack) |\n| Debug live web applications | [Chrome](/en/chrome) |\n| Build custom agents for your own workflows | [Agent SDK](https://platform.claude.com/docs/en/agent-sdk/overview) |\n\n## Next steps\n\nOnce you've installed Claude Code, these guides help you go deeper.\n\n* [Quickstart](/en/quickstart): walk through your first real task, from exploring a codebase to committing a fix\n* Level up with [best practices](/en/best-practices) and [common workflows](/en/common-workflows)\n* [Settings](/en/settings): customize Claude Code for your workflow\n* [Troubleshooting](/en/troubleshooting): solutions for common issues\n* [code.claude.com](https://code.claude.com/): demos, pricing, and product details\n"}]},"uuid":"e3438283-baee-43ec-a474-775211a5f218","timestamp":"2026-02-23T18:21:40.867Z","sourceToolAssistantUUID":"605c15a3-9bef-49fb-ad66-6f263d343a54"} {"parentUuid":"e3438283-baee-43ec-a474-775211a5f218","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUseFailure","hookName":"PostToolUseFailure:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/observability_logger.py --event 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{"parentUuid":"2da657ce-8bdb-4262-9950-514bd22f3d05","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_019bhsXiwnq4YNzXQcDz19Bh","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# Hooks reference\n\n> Reference for Claude Code hook events, configuration schema, JSON input/output formats, exit codes, async hooks, prompt hooks, and MCP tool hooks.\n\n\n For a quickstart guide with examples, see [Automate workflows with hooks](/en/hooks-guide).\n\n\nHooks are user-defined shell commands or LLM prompts that execute automatically at specific points in Claude Code's lifecycle. Use this reference to look up event schemas, configuration options, JSON input/output formats, and advanced features like async hooks and MCP tool hooks. If you're setting up hooks for the first time, start with the [guide](/en/hooks-guide) instead.\n\n## Hook lifecycle\n\nHooks fire at specific points during a Claude Code session. When an event fires and a matcher matches, Claude Code passes JSON context about the event to your hook handler. For command hooks, this arrives on stdin. Your handler can then inspect the input, take action, and optionally return a decision. Some events fire once per session, while others fire repeatedly inside the agentic loop:\n\n
\n \n \"Hook\n \n
\n\nThe table below summarizes when each event fires. The [Hook events](#hook-events) section documents the full input schema and decision control options for each one.\n\n| Event | When it fires |\n| :------------------- | :---------------------------------------------------------------------------------------------------------- |\n| `SessionStart` | When a session begins or resumes |\n| `UserPromptSubmit` | When you submit a prompt, before Claude processes it |\n| `PreToolUse` | Before a tool call executes. Can block it |\n| `PermissionRequest` | When a permission dialog appears |\n| `PostToolUse` | After a tool call succeeds |\n| `PostToolUseFailure` | After a tool call fails |\n| `Notification` | When Claude Code sends a notification |\n| `SubagentStart` | When a subagent is spawned |\n| `SubagentStop` | When a subagent finishes |\n| `Stop` | When Claude finishes responding |\n| `TeammateIdle` | When an [agent team](/en/agent-teams) teammate is about to go idle |\n| `TaskCompleted` | When a task is being marked as completed |\n| `ConfigChange` | When a configuration file changes during a session |\n| `WorktreeCreate` | When a worktree is being created via `--worktree` or `isolation: \"worktree\"`. Replaces default git behavior |\n| `WorktreeRemove` | When a worktree is being removed, either at session exit or when a subagent finishes |\n| `PreCompact` | Before context compaction |\n| `SessionEnd` | When a session terminates |\n\n### How a hook resolves\n\nTo see how these pieces fit together, consider this `PreToolUse` hook that blocks destructive shell commands. The hook runs `block-rm.sh` before every Bash tool call:\n\n```json theme={null}\n{\n \"hooks\": {\n \"PreToolUse\": [\n {\n \"matcher\": \"Bash\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \".claude/hooks/block-rm.sh\"\n }\n ]\n }\n ]\n }\n}\n```\n\nThe script reads the JSON input from stdin, extracts the command, and returns a `permissionDecision` of `\"deny\"` if it contains `rm -rf`:\n\n```bash theme={null}\n#!/bin/bash\n# .claude/hooks/block-rm.sh\nCOMMAND=$(jq -r '.tool_input.command')\n\nif echo \"$COMMAND\" | grep -q 'rm -rf'; then\n jq -n '{\n hookSpecificOutput: {\n hookEventName: \"PreToolUse\",\n permissionDecision: \"deny\",\n permissionDecisionReason: \"Destructive command blocked by hook\"\n }\n }'\nelse\n exit 0 # allow the command\nfi\n```\n\nNow suppose Claude Code decides to run `Bash \"rm -rf /tmp/build\"`. Here's what happens:\n\n\n \"Hook\n\n\n\n \n The `PreToolUse` event fires. Claude Code sends the tool input as JSON on stdin to the hook:\n\n ```json theme={null}\n { \"tool_name\": \"Bash\", \"tool_input\": { \"command\": \"rm -rf /tmp/build\" }, ... }\n ```\n \n\n \n The matcher `\"Bash\"` matches the tool name, so `block-rm.sh` runs. If you omit the matcher or use `\"*\"`, the hook runs on every occurrence of the event. Hooks only skip when a matcher is defined and doesn't match.\n \n\n \n The script extracts `\"rm -rf /tmp/build\"` from the input and finds `rm -rf`, so it prints a decision to stdout:\n\n ```json theme={null}\n {\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PreToolUse\",\n \"permissionDecision\": \"deny\",\n \"permissionDecisionReason\": \"Destructive command blocked by hook\"\n }\n }\n ```\n\n If the command had been safe (like `npm test`), the script would hit `exit 0` instead, which tells Claude Code to allow the tool call with no further action.\n \n\n \n Claude Code reads the JSON decision, blocks the tool call, and shows Claude the reason.\n \n\n\nThe [Configuration](#configuration) section below documents the full schema, and each [hook event](#hook-events) section documents what input your command receives and what output it can return.\n\n## Configuration\n\nHooks are defined in JSON settings files. The configuration has three levels of nesting:\n\n1. Choose a [hook event](#hook-events) to respond to, like `PreToolUse` or `Stop`\n2. Add a [matcher group](#matcher-patterns) to filter when it fires, like \"only for the Bash tool\"\n3. Define one or more [hook handlers](#hook-handler-fields) to run when matched\n\nSee [How a hook resolves](#how-a-hook-resolves) above for a complete walkthrough with an annotated example.\n\n\n This page uses specific terms for each level: **hook event** for the lifecycle point, **matcher group** for the filter, and **hook handler** for the shell command, prompt, or agent that runs. \"Hook\" on its own refers to the general feature.\n\n\n### Hook locations\n\nWhere you define a hook determines its scope:\n\n| Location | Scope | Shareable |\n| :--------------------------------------------------------- | :---------------------------- | :--------------------------------- |\n| `~/.claude/settings.json` | All your projects | No, local to your machine |\n| `.claude/settings.json` | Single project | Yes, can be committed to the repo |\n| `.claude/settings.local.json` | Single project | No, gitignored |\n| Managed policy settings | Organization-wide | Yes, admin-controlled |\n| [Plugin](/en/plugins) `hooks/hooks.json` | When plugin is enabled | Yes, bundled with the plugin |\n| [Skill](/en/skills) or [agent](/en/sub-agents) frontmatter | While the component is active | Yes, defined in the component file |\n\nFor details on settings file resolution, see [settings](/en/settings). Enterprise administrators can use `allowManagedHooksOnly` to block user, project, and plugin hooks. See [Hook configuration](/en/settings#hook-configuration).\n\n### Matcher patterns\n\nThe `matcher` field is a regex string that filters when hooks fire. Use `\"*\"`, `\"\"`, or omit `matcher` entirely to match all occurrences. Each event type matches on a different field:\n\n| Event | What the matcher filters | Example matcher values |\n| :---------------------------------------------------------------------------------------------- | :------------------------ | :--------------------------------------------------------------------------------- |\n| `PreToolUse`, `PostToolUse`, `PostToolUseFailure`, `PermissionRequest` | tool name | `Bash`, `Edit\\|Write`, `mcp__.*` |\n| `SessionStart` | how the session started | `startup`, `resume`, `clear`, `compact` |\n| `SessionEnd` | why the session ended | `clear`, `logout`, `prompt_input_exit`, `bypass_permissions_disabled`, `other` |\n| `Notification` | notification type | `permission_prompt`, `idle_prompt`, `auth_success`, `elicitation_dialog` |\n| `SubagentStart` | agent type | `Bash`, `Explore`, `Plan`, or custom agent names |\n| `PreCompact` | what triggered compaction | `manual`, `auto` |\n| `SubagentStop` | agent type | same values as `SubagentStart` |\n| `ConfigChange` | configuration source | `user_settings`, `project_settings`, `local_settings`, `policy_settings`, `skills` |\n| `UserPromptSubmit`, `Stop`, `TeammateIdle`, `TaskCompleted`, `WorktreeCreate`, `WorktreeRemove` | no matcher support | always fires on every occurrence |\n\nThe matcher is a regex, so `Edit|Write` matches either tool and `Notebook.*` matches any tool starting with Notebook. The matcher runs against a field from the [JSON input](#hook-input-and-output) that Claude Code sends to your hook on stdin. For tool events, that field is `tool_name`. Each [hook event](#hook-events) section lists the full set of matcher values and the input schema for that event.\n\nThis example runs a linting script only when Claude writes or edits a file:\n\n```json theme={null}\n{\n \"hooks\": {\n \"PostToolUse\": [\n {\n \"matcher\": \"Edit|Write\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"/path/to/lint-check.sh\"\n }\n ]\n }\n ]\n }\n}\n```\n\n`UserPromptSubmit`, `Stop`, `TeammateIdle`, `TaskCompleted`, `WorktreeCreate`, and `WorktreeRemove` don't support matchers and always fire on every occurrence. If you add a `matcher` field to these events, it is silently ignored.\n\n#### Match MCP tools\n\n[MCP](/en/mcp) server tools appear as regular tools in tool events (`PreToolUse`, `PostToolUse`, `PostToolUseFailure`, `PermissionRequest`), so you can match them the same way you match any other tool name.\n\nMCP tools follow the naming pattern `mcp____`, for example:\n\n* `mcp__memory__create_entities`: Memory server's create entities tool\n* `mcp__filesystem__read_file`: Filesystem server's read file tool\n* `mcp__github__search_repositories`: GitHub server's search tool\n\nUse regex patterns to target specific MCP tools or groups of tools:\n\n* `mcp__memory__.*` matches all tools from the `memory` server\n* `mcp__.*__write.*` matches any tool containing \"write\" from any server\n\nThis example logs all memory server operations and validates write operations from any MCP server:\n\n```json theme={null}\n{\n \"hooks\": {\n \"PreToolUse\": [\n {\n \"matcher\": \"mcp__memory__.*\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"echo 'Memory operation initiated' >> ~/mcp-operations.log\"\n }\n ]\n },\n {\n \"matcher\": \"mcp__.*__write.*\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"/home/user/scripts/validate-mcp-write.py\"\n }\n ]\n }\n ]\n }\n}\n```\n\n### Hook handler fields\n\nEach object in the inner `hooks` array is a hook handler: the shell command, LLM prompt, or agent that runs when the matcher matches. There are three types:\n\n* **[Command hooks](#command-hook-fields)** (`type: \"command\"`): run a shell command. Your script receives the event's [JSON input](#hook-input-and-output) on stdin and communicates results back through exit codes and stdout.\n* **[Prompt hooks](#prompt-and-agent-hook-fields)** (`type: \"prompt\"`): send a prompt to a Claude model for single-turn evaluation. The model returns a yes/no decision as JSON. See [Prompt-based hooks](#prompt-based-hooks).\n* **[Agent hooks](#prompt-and-agent-hook-fields)** (`type: \"agent\"`): spawn a subagent that can use tools like Read, Grep, and Glob to verify conditions before returning a decision. See [Agent-based hooks](#agent-based-hooks).\n\n#### Common fields\n\nThese fields apply to all hook types:\n\n| Field | Required | Description |\n| :-------------- | :------- | :-------------------------------------------------------------------------------------------------------------------------------------------- |\n| `type` | yes | `\"command\"`, `\"prompt\"`, or `\"agent\"` |\n| `timeout` | no | Seconds before canceling. Defaults: 600 for command, 30 for prompt, 60 for agent |\n| `statusMessage` | no | Custom spinner message displayed while the hook runs |\n| `once` | no | If `true`, runs only once per session then is removed. Skills only, not agents. See [Hooks in skills and agents](#hooks-in-skills-and-agents) |\n\n#### Command hook fields\n\nIn addition to the [common fields](#common-fields), command hooks accept these fields:\n\n| Field | Required | Description |\n| :-------- | :------- | :------------------------------------------------------------------------------------------------------------------ |\n| `command` | yes | Shell command to execute |\n| `async` | no | If `true`, runs in the background without blocking. See [Run hooks in the background](#run-hooks-in-the-background) |\n\n#### Prompt and agent hook fields\n\nIn addition to the [common fields](#common-fields), prompt and agent hooks accept these fields:\n\n| Field | Required | Description |\n| :------- | :------- | :------------------------------------------------------------------------------------------ |\n| `prompt` | yes | Prompt text to send to the model. Use `$ARGUMENTS` as a placeholder for the hook input JSON |\n| `model` | no | Model to use for evaluation. Defaults to a fast model |\n\nAll matching hooks run in parallel, and identical handlers are deduplicated automatically. Handlers run in the current directory with Claude Code's environment. The `$CLAUDE_CODE_REMOTE` environment variable is set to `\"true\"` in remote web environments and not set in the local CLI.\n\n### Reference scripts by path\n\nUse environment variables to reference hook scripts relative to the project or plugin root, regardless of the working directory when the hook runs:\n\n* `$CLAUDE_PROJECT_DIR`: the project root. Wrap in quotes to handle paths with spaces.\n* `${CLAUDE_PLUGIN_ROOT}`: the plugin's root directory, for scripts bundled with a [plugin](/en/plugins).\n\n\n \n This example uses `$CLAUDE_PROJECT_DIR` to run a style checker from the project's `.claude/hooks/` directory after any `Write` or `Edit` tool call:\n\n ```json theme={null}\n {\n \"hooks\": {\n \"PostToolUse\": [\n {\n \"matcher\": \"Write|Edit\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"\\\"$CLAUDE_PROJECT_DIR\\\"/.claude/hooks/check-style.sh\"\n }\n ]\n }\n ]\n }\n }\n ```\n \n\n \n Define plugin hooks in `hooks/hooks.json` with an optional top-level `description` field. When a plugin is enabled, its hooks merge with your user and project hooks.\n\n This example runs a formatting script bundled with the plugin:\n\n ```json theme={null}\n {\n \"description\": \"Automatic code formatting\",\n \"hooks\": {\n \"PostToolUse\": [\n {\n \"matcher\": \"Write|Edit\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"${CLAUDE_PLUGIN_ROOT}/scripts/format.sh\",\n \"timeout\": 30\n }\n ]\n }\n ]\n }\n }\n ```\n\n See the [plugin components reference](/en/plugins-reference#hooks) for details on creating plugin hooks.\n \n\n\n### Hooks in skills and agents\n\nIn addition to settings files and plugins, hooks can be defined directly in [skills](/en/skills) and [subagents](/en/sub-agents) using frontmatter. These hooks are scoped to the component's lifecycle and only run when that component is active.\n\nAll hook events are supported. For subagents, `Stop` hooks are automatically converted to `SubagentStop` since that is the event that fires when a subagent completes.\n\nHooks use the same configuration format as settings-based hooks but are scoped to the component's lifetime and cleaned up when it finishes.\n\nThis skill defines a `PreToolUse` hook that runs a security validation script before each `Bash` command:\n\n```yaml theme={null}\n---\nname: secure-operations\ndescription: Perform operations with security checks\nhooks:\n PreToolUse:\n - matcher: \"Bash\"\n hooks:\n - type: command\n command: \"./scripts/security-check.sh\"\n---\n```\n\nAgents use the same format in their YAML frontmatter.\n\n### The `/hooks` menu\n\nType `/hooks` in Claude Code to open the interactive hooks manager, where you can view, add, and delete hooks without editing settings files directly. For a step-by-step walkthrough, see [Set up your first hook](/en/hooks-guide#set-up-your-first-hook) in the guide.\n\nEach hook in the menu is labeled with a bracket prefix indicating its source:\n\n* `[User]`: from `~/.claude/settings.json`\n* `[Project]`: from `.claude/settings.json`\n* `[Local]`: from `.claude/settings.local.json`\n* `[Plugin]`: from a plugin's `hooks/hooks.json`, read-only\n\n### Disable or remove hooks\n\nTo remove a hook, delete its entry from the settings JSON file, or use the `/hooks` menu and select the hook to delete it.\n\nTo temporarily disable all hooks without removing them, set `\"disableAllHooks\": true` in your settings file or use the toggle in the `/hooks` menu. There is no way to disable an individual hook while keeping it in the configuration.\n\nThe `disableAllHooks` setting respects the managed settings hierarchy. If an administrator has configured hooks through managed policy settings, `disableAllHooks` set in user, project, or local settings cannot disable those managed hooks. Only `disableAllHooks` set at the managed settings level can disable managed hooks.\n\nDirect edits to hooks in settings files don't take effect immediately. Claude Code captures a snapshot of hooks at startup and uses it throughout the session. This prevents malicious or accidental hook modifications from taking effect mid-session without your review. If hooks are modified externally, Claude Code warns you and requires review in the `/hooks` menu before changes apply.\n\n## Hook input and output\n\nHooks receive JSON data via stdin and communicate results through exit codes, stdout, and stderr. This section covers fields and behavior common to all events. Each event's section under [Hook events](#hook-events) includes its specific input schema and decision control options.\n\n### Common input fields\n\nAll hook events receive these fields via stdin as JSON, in addition to event-specific fields documented in each [hook event](#hook-events) section:\n\n| Field | Description |\n| :---------------- | :----------------------------------------------------------------------------------------------------------------------------------------- |\n| `session_id` | Current session identifier |\n| `transcript_path` | Path to conversation JSON |\n| `cwd` | Current working directory when the hook is invoked |\n| `permission_mode` | Current [permission mode](/en/permissions#permission-modes): `\"default\"`, `\"plan\"`, `\"acceptEdits\"`, `\"dontAsk\"`, or `\"bypassPermissions\"` |\n| `hook_event_name` | Name of the event that fired |\n\nFor example, a `PreToolUse` hook for a Bash command receives this on stdin:\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/home/user/.claude/projects/.../transcript.jsonl\",\n \"cwd\": \"/home/user/my-project\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"PreToolUse\",\n \"tool_name\": \"Bash\",\n \"tool_input\": {\n \"command\": \"npm test\"\n }\n}\n```\n\nThe `tool_name` and `tool_input` fields are event-specific. Each [hook event](#hook-events) section documents the additional fields for that event.\n\n### Exit code output\n\nThe exit code from your hook command tells Claude Code whether the action should proceed, be blocked, or be ignored.\n\n**Exit 0** means success. Claude Code parses stdout for [JSON output fields](#json-output). JSON output is only processed on exit 0. For most events, stdout is only shown in verbose mode (`Ctrl+O`). The exceptions are `UserPromptSubmit` and `SessionStart`, where stdout is added as context that Claude can see and act on.\n\n**Exit 2** means a blocking error. Claude Code ignores stdout and any JSON in it. Instead, stderr text is fed back to Claude as an error message. The effect depends on the event: `PreToolUse` blocks the tool call, `UserPromptSubmit` rejects the prompt, and so on. See [exit code 2 behavior](#exit-code-2-behavior-per-event) for the full list.\n\n**Any other exit code** is a non-blocking error. stderr is shown in verbose mode (`Ctrl+O`) and execution continues.\n\nFor example, a hook command script that blocks dangerous Bash commands:\n\n```bash theme={null}\n#!/bin/bash\n# Reads JSON input from stdin, checks the command\ncommand=$(jq -r '.tool_input.command' < /dev/stdin)\n\nif [[ \"$command\" == rm* ]]; then\n echo \"Blocked: rm commands are not allowed\" >&2\n exit 2 # Blocking error: tool call is prevented\nfi\n\nexit 0 # Success: tool call proceeds\n```\n\n#### Exit code 2 behavior per event\n\nExit code 2 is the way a hook signals \"stop, don't do this.\" The effect depends on the event, because some events represent actions that can be blocked (like a tool call that hasn't happened yet) and others represent things that already happened or can't be prevented.\n\n| Hook event | Can block? | What happens on exit 2 |\n| :------------------- | :--------- | :---------------------------------------------------------------------------- |\n| `PreToolUse` | Yes | Blocks the tool call |\n| `PermissionRequest` | Yes | Denies the permission |\n| `UserPromptSubmit` | Yes | Blocks prompt processing and erases the prompt |\n| `Stop` | Yes | Prevents Claude from stopping, continues the conversation |\n| `SubagentStop` | Yes | Prevents the subagent from stopping |\n| `TeammateIdle` | Yes | Prevents the teammate from going idle (teammate continues working) |\n| `TaskCompleted` | Yes | Prevents the task from being marked as completed |\n| `ConfigChange` | Yes | Blocks the configuration change from taking effect (except `policy_settings`) |\n| `PostToolUse` | No | Shows stderr to Claude (tool already ran) |\n| `PostToolUseFailure` | No | Shows stderr to Claude (tool already failed) |\n| `Notification` | No | Shows stderr to user only |\n| `SubagentStart` | No | Shows stderr to user only |\n| `SessionStart` | No | Shows stderr to user only |\n| `SessionEnd` | No | Shows stderr to user only |\n| `PreCompact` | No | Shows stderr to user only |\n| `WorktreeCreate` | Yes | Any non-zero exit code causes worktree creation to fail |\n| `WorktreeRemove` | No | Failures are logged in debug mode only |\n\n### JSON output\n\nExit codes let you allow or block, but JSON output gives you finer-grained control. Instead of exiting with code 2 to block, exit 0 and print a JSON object to stdout. Claude Code reads specific fields from that JSON to control behavior, including [decision control](#decision-control) for blocking, allowing, or escalating to the user.\n\n\n You must choose one approach per hook, not both: either use exit codes alone for signaling, or exit 0 and print JSON for structured control. Claude Code only processes JSON on exit 0. If you exit 2, any JSON is ignored.\n\n\nYour hook's stdout must contain only the JSON object. If your shell profile prints text on startup, it can interfere with JSON parsing. See [JSON validation failed](/en/hooks-guide#json-validation-failed) in the troubleshooting guide.\n\nThe JSON object supports three kinds of fields:\n\n* **Universal fields** like `continue` work across all events. These are listed in the table below.\n* **Top-level `decision` and `reason`** are used by some events to block or provide feedback.\n* **`hookSpecificOutput`** is a nested object for events that need richer control. It requires a `hookEventName` field set to the event name.\n\n| Field | Default | Description |\n| :--------------- | :------ | :------------------------------------------------------------------------------------------------------------------------- |\n| `continue` | `true` | If `false`, Claude stops processing entirely after the hook runs. Takes precedence over any event-specific decision fields |\n| `stopReason` | none | Message shown to the user when `continue` is `false`. Not shown to Claude |\n| `suppressOutput` | `false` | If `true`, hides stdout from verbose mode output |\n| `systemMessage` | none | Warning message shown to the user |\n\nTo stop Claude entirely regardless of event type:\n\n```json theme={null}\n{ \"continue\": false, \"stopReason\": \"Build failed, fix errors before continuing\" }\n```\n\n#### Decision control\n\nNot every event supports blocking or controlling behavior through JSON. The events that do each use a different set of fields to express that decision. Use this table as a quick reference before writing a hook:\n\n| Events | Decision pattern | Key fields |\n| :---------------------------------------------------------------------------------- | :------------------- | :-------------------------------------------------------------------------- |\n| UserPromptSubmit, PostToolUse, PostToolUseFailure, Stop, SubagentStop, ConfigChange | Top-level `decision` | `decision: \"block\"`, `reason` |\n| TeammateIdle, TaskCompleted | Exit code only | Exit code 2 blocks the action, stderr is fed back as feedback |\n| PreToolUse | `hookSpecificOutput` | `permissionDecision` (allow/deny/ask), `permissionDecisionReason` |\n| PermissionRequest | `hookSpecificOutput` | `decision.behavior` (allow/deny) |\n| WorktreeCreate | stdout path | Hook prints absolute path to created worktree. Non-zero exit fails creation |\n| WorktreeRemove, Notification, SessionEnd, PreCompact | None | No decision control. Used for side effects like logging or cleanup |\n\nHere are examples of each pattern in action:\n\n\n \n Used by `UserPromptSubmit`, `PostToolUse`, `PostToolUseFailure`, `Stop`, `SubagentStop`, and `ConfigChange`. The only value is `\"block\"`. To allow the action to proceed, omit `decision` from your JSON, or exit 0 without any JSON at all:\n\n ```json theme={null}\n {\n \"decision\": \"block\",\n \"reason\": \"Test suite must pass before proceeding\"\n }\n ```\n \n\n \n Uses `hookSpecificOutput` for richer control: allow, deny, or escalate to the user. You can also modify tool input before it runs or inject additional context for Claude. See [PreToolUse decision control](#pretooluse-decision-control) for the full set of options.\n\n ```json theme={null}\n {\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PreToolUse\",\n \"permissionDecision\": \"deny\",\n \"permissionDecisionReason\": \"Database writes are not allowed\"\n }\n }\n ```\n \n\n \n Uses `hookSpecificOutput` to allow or deny a permission request on behalf of the user. When allowing, you can also modify the tool's input or apply permission rules so the user isn't prompted again. See [PermissionRequest decision control](#permissionrequest-decision-control) for the full set of options.\n\n ```json theme={null}\n {\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PermissionRequest\",\n \"decision\": {\n \"behavior\": \"allow\",\n \"updatedInput\": {\n \"command\": \"npm run lint\"\n }\n }\n }\n }\n ```\n \n\n\nFor extended examples including Bash command validation, prompt filtering, and auto-approval scripts, see [What you can automate](/en/hooks-guide#what-you-can-automate) in the guide and the [Bash command validator reference implementation](https://github.com/anthropics/claude-code/blob/main/examples/hooks/bash_command_validator_example.py).\n\n## Hook events\n\nEach event corresponds to a point in Claude Code's lifecycle where hooks can run. The sections below are ordered to match the lifecycle: from session setup through the agentic loop to session end. Each section describes when the event fires, what matchers it supports, the JSON input it receives, and how to control behavior through output.\n\n### SessionStart\n\nRuns when Claude Code starts a new session or resumes an existing session. Useful for loading development context like existing issues or recent changes to your codebase, or setting up environment variables. For static context that does not require a script, use [CLAUDE.md](/en/memory) instead.\n\nSessionStart runs on every session, so keep these hooks fast.\n\nThe matcher value corresponds to how the session was initiated:\n\n| Matcher | When it fires |\n| :-------- | :------------------------------------- |\n| `startup` | New session |\n| `resume` | `--resume`, `--continue`, or `/resume` |\n| `clear` | `/clear` |\n| `compact` | Auto or manual compaction |\n\n#### SessionStart input\n\nIn addition to the [common input fields](#common-input-fields), SessionStart hooks receive `source`, `model`, and optionally `agent_type`. The `source` field indicates how the session started: `\"startup\"` for new sessions, `\"resume\"` for resumed sessions, `\"clear\"` after `/clear`, or `\"compact\"` after compaction. The `model` field contains the model identifier. If you start Claude Code with `claude --agent `, an `agent_type` field contains the agent name.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"SessionStart\",\n \"source\": \"startup\",\n \"model\": \"claude-sonnet-4-6\"\n}\n```\n\n#### SessionStart decision control\n\nAny text your hook script prints to stdout is added as context for Claude. In addition to the [JSON output fields](#json-output) available to all hooks, you can return these event-specific fields:\n\n| Field | Description |\n| :------------------ | :------------------------------------------------------------------------ |\n| `additionalContext` | String added to Claude's context. Multiple hooks' values are concatenated |\n\n```json theme={null}\n{\n \"hookSpecificOutput\": {\n \"hookEventName\": \"SessionStart\",\n \"additionalContext\": \"My additional context here\"\n }\n}\n```\n\n#### Persist environment variables\n\nSessionStart hooks have access to the `CLAUDE_ENV_FILE` environment variable, which provides a file path where you can persist environment variables for subsequent Bash commands.\n\nTo set individual environment variables, write `export` statements to `CLAUDE_ENV_FILE`. Use append (`>>`) to preserve variables set by other hooks:\n\n```bash theme={null}\n#!/bin/bash\n\nif [ -n \"$CLAUDE_ENV_FILE\" ]; then\n echo 'export NODE_ENV=production' >> \"$CLAUDE_ENV_FILE\"\n echo 'export DEBUG_LOG=true' >> \"$CLAUDE_ENV_FILE\"\n echo 'export PATH=\"$PATH:./node_modules/.bin\"' >> \"$CLAUDE_ENV_FILE\"\nfi\n\nexit 0\n```\n\nTo capture all environment changes from setup commands, compare the exported variables before and after:\n\n```bash theme={null}\n#!/bin/bash\n\nENV_BEFORE=$(export -p | sort)\n\n# Run your setup commands that modify the environment\nsource ~/.nvm/nvm.sh\nnvm use 20\n\nif [ -n \"$CLAUDE_ENV_FILE\" ]; then\n ENV_AFTER=$(export -p | sort)\n comm -13 <(echo \"$ENV_BEFORE\") <(echo \"$ENV_AFTER\") >> \"$CLAUDE_ENV_FILE\"\nfi\n\nexit 0\n```\n\nAny variables written to this file will be available in all subsequent Bash commands that Claude Code executes during the session.\n\n\n `CLAUDE_ENV_FILE` is available for SessionStart hooks. Other hook types do not have access to this variable.\n\n\n### UserPromptSubmit\n\nRuns when the user submits a prompt, before Claude processes it. This allows you\nto add additional context based on the prompt/conversation, validate prompts, or\nblock certain types of prompts.\n\n#### UserPromptSubmit input\n\nIn addition to the [common input fields](#common-input-fields), UserPromptSubmit hooks receive the `prompt` field containing the text the user submitted.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"UserPromptSubmit\",\n \"prompt\": \"Write a function to calculate the factorial of a number\"\n}\n```\n\n#### UserPromptSubmit decision control\n\n`UserPromptSubmit` hooks can control whether a user prompt is processed and add context. All [JSON output fields](#json-output) are available.\n\nThere are two ways to add context to the conversation on exit code 0:\n\n* **Plain text stdout**: any non-JSON text written to stdout is added as context\n* **JSON with `additionalContext`**: use the JSON format below for more control. The `additionalContext` field is added as context\n\nPlain stdout is shown as hook output in the transcript. The `additionalContext` field is added more discretely.\n\nTo block a prompt, return a JSON object with `decision` set to `\"block\"`:\n\n| Field | Description |\n| :------------------ | :----------------------------------------------------------------------------------------------------------------- |\n| `decision` | `\"block\"` prevents the prompt from being processed and erases it from context. Omit to allow the prompt to proceed |\n| `reason` | Shown to the user when `decision` is `\"block\"`. Not added to context |\n| `additionalContext` | String added to Claude's context |\n\n```json theme={null}\n{\n \"decision\": \"block\",\n \"reason\": \"Explanation for decision\",\n \"hookSpecificOutput\": {\n \"hookEventName\": \"UserPromptSubmit\",\n \"additionalContext\": \"My additional context here\"\n }\n}\n```\n\n\n The JSON format isn't required for simple use cases. To add context, you can print plain text to stdout with exit code 0. Use JSON when you need to\n block prompts or want more structured control.\n\n\n### PreToolUse\n\nRuns after Claude creates tool parameters and before processing the tool call. Matches on tool name: `Bash`, `Edit`, `Write`, `Read`, `Glob`, `Grep`, `Task`, `WebFetch`, `WebSearch`, and any [MCP tool names](#match-mcp-tools).\n\nUse [PreToolUse decision control](#pretooluse-decision-control) to allow, deny, or ask for permission to use the tool.\n\n#### PreToolUse input\n\nIn addition to the [common input fields](#common-input-fields), PreToolUse hooks receive `tool_name`, `tool_input`, and `tool_use_id`. The `tool_input` fields depend on the tool:\n\n##### Bash\n\nExecutes shell commands.\n\n| Field | Type | Example | Description |\n| :------------------ | :------ | :----------------- | :-------------------------------------------- |\n| `command` | string | `\"npm test\"` | The shell command to execute |\n| `description` | string | `\"Run test suite\"` | Optional description of what the command does |\n| `timeout` | number | `120000` | Optional timeout in milliseconds |\n| `run_in_background` | boolean | `false` | Whether to run the command in background |\n\n##### Write\n\nCreates or overwrites a file.\n\n| Field | Type | Example | Description |\n| :---------- | :----- | :-------------------- | :--------------------------------- |\n| `file_path` | string | `\"/path/to/file.txt\"` | Absolute path to the file to write |\n| `content` | string | `\"file content\"` | Content to write to the file |\n\n##### Edit\n\nReplaces a string in an existing file.\n\n| Field | Type | Example | Description |\n| :------------ | :------ | :-------------------- | :--------------------------------- |\n| `file_path` | string | `\"/path/to/file.txt\"` | Absolute path to the file to edit |\n| `old_string` | string | `\"original text\"` | Text to find and replace |\n| `new_string` | string | `\"replacement text\"` | Replacement text |\n| `replace_all` | boolean | `false` | Whether to replace all occurrences |\n\n##### Read\n\nReads file contents.\n\n| Field | Type | Example | Description |\n| :---------- | :----- | :-------------------- | :----------------------------------------- |\n| `file_path` | string | `\"/path/to/file.txt\"` | Absolute path to the file to read |\n| `offset` | number | `10` | Optional line number to start reading from |\n| `limit` | number | `50` | Optional number of lines to read |\n\n##### Glob\n\nFinds files matching a glob pattern.\n\n| Field | Type | Example | Description |\n| :-------- | :----- | :--------------- | :--------------------------------------------------------------------- |\n| `pattern` | string | `\"**/*.ts\"` | Glob pattern to match files against |\n| `path` | string | `\"/path/to/dir\"` | Optional directory to search in. Defaults to current working directory |\n\n##### Grep\n\nSearches file contents with regular expressions.\n\n| Field | Type | Example | Description |\n| :------------ | :------ | :--------------- | :------------------------------------------------------------------------------------ |\n| `pattern` | string | `\"TODO.*fix\"` | Regular expression pattern to search for |\n| `path` | string | `\"/path/to/dir\"` | Optional file or directory to search in |\n| `glob` | string | `\"*.ts\"` | Optional glob pattern to filter files |\n| `output_mode` | string | `\"content\"` | `\"content\"`, `\"files_with_matches\"`, or `\"count\"`. Defaults to `\"files_with_matches\"` |\n| `-i` | boolean | `true` | Case insensitive search |\n| `multiline` | boolean | `false` | Enable multiline matching |\n\n##### WebFetch\n\nFetches and processes web content.\n\n| Field | Type | Example | Description |\n| :------- | :----- | :---------------------------- | :----------------------------------- |\n| `url` | string | `\"https://example.com/api\"` | URL to fetch content from |\n| `prompt` | string | `\"Extract the API endpoints\"` | Prompt to run on the fetched content |\n\n##### WebSearch\n\nSearches the web.\n\n| Field | Type | Example | Description |\n| :---------------- | :----- | :----------------------------- | :------------------------------------------------ |\n| `query` | string | `\"react hooks best practices\"` | Search query |\n| `allowed_domains` | array | `[\"docs.example.com\"]` | Optional: only include results from these domains |\n| `blocked_domains` | array | `[\"spam.example.com\"]` | Optional: exclude results from these domains |\n\n##### Task\n\nSpawns a [subagent](/en/sub-agents).\n\n| Field | Type | Example | Description |\n| :-------------- | :----- | :------------------------- | :------------------------------------------- |\n| `prompt` | string | `\"Find all API endpoints\"` | The task for the agent to perform |\n| `description` | string | `\"Find API endpoints\"` | Short description of the task |\n| `subagent_type` | string | `\"Explore\"` | Type of specialized agent to use |\n| `model` | string | `\"sonnet\"` | Optional model alias to override the default |\n\n#### PreToolUse decision control\n\n`PreToolUse` hooks can control whether a tool call proceeds. Unlike other hooks that use a top-level `decision` field, PreToolUse returns its decision inside a `hookSpecificOutput` object. This gives it richer control: three outcomes (allow, deny, or ask) plus the ability to modify tool input before execution.\n\n| Field | Description |\n| :------------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------- |\n| `permissionDecision` | `\"allow\"` bypasses the permission system, `\"deny\"` prevents the tool call, `\"ask\"` prompts the user to confirm |\n| `permissionDecisionReason` | For `\"allow\"` and `\"ask\"`, shown to the user but not Claude. For `\"deny\"`, shown to Claude |\n| `updatedInput` | Modifies the tool's input parameters before execution. Combine with `\"allow\"` to auto-approve, or `\"ask\"` to show the modified input to the user |\n| `additionalContext` | String added to Claude's context before the tool executes |\n\n```json theme={null}\n{\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PreToolUse\",\n \"permissionDecision\": \"allow\",\n \"permissionDecisionReason\": \"My reason here\",\n \"updatedInput\": {\n \"field_to_modify\": \"new value\"\n },\n \"additionalContext\": \"Current environment: production. Proceed with caution.\"\n }\n}\n```\n\n\n PreToolUse previously used top-level `decision` and `reason` fields, but these are deprecated for this event. Use `hookSpecificOutput.permissionDecision` and `hookSpecificOutput.permissionDecisionReason` instead. The deprecated values `\"approve\"` and `\"block\"` map to `\"allow\"` and `\"deny\"` respectively. Other events like PostToolUse and Stop continue to use top-level `decision` and `reason` as their current format.\n\n\n### PermissionRequest\n\nRuns when the user is shown a permission dialog.\nUse [PermissionRequest decision control](#permissionrequest-decision-control) to allow or deny on behalf of the user.\n\nMatches on tool name, same values as PreToolUse.\n\n#### PermissionRequest input\n\nPermissionRequest hooks receive `tool_name` and `tool_input` fields like PreToolUse hooks, but without `tool_use_id`. An optional `permission_suggestions` array contains the \"always allow\" options the user would normally see in the permission dialog. The difference is when the hook fires: PermissionRequest hooks run when a permission dialog is about to be shown to the user, while PreToolUse hooks run before tool execution regardless of permission status.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"PermissionRequest\",\n \"tool_name\": \"Bash\",\n \"tool_input\": {\n \"command\": \"rm -rf node_modules\",\n \"description\": \"Remove node_modules directory\"\n },\n \"permission_suggestions\": [\n { \"type\": \"toolAlwaysAllow\", \"tool\": \"Bash\" }\n ]\n}\n```\n\n#### PermissionRequest decision control\n\n`PermissionRequest` hooks can allow or deny permission requests. In addition to the [JSON output fields](#json-output) available to all hooks, your hook script can return a `decision` object with these event-specific fields:\n\n| Field | Description |\n| :------------------- | :------------------------------------------------------------------------------------------------------------- |\n| `behavior` | `\"allow\"` grants the permission, `\"deny\"` denies it |\n| `updatedInput` | For `\"allow\"` only: modifies the tool's input parameters before execution |\n| `updatedPermissions` | For `\"allow\"` only: applies permission rule updates, equivalent to the user selecting an \"always allow\" option |\n| `message` | For `\"deny\"` only: tells Claude why the permission was denied |\n| `interrupt` | For `\"deny\"` only: if `true`, stops Claude |\n\n```json theme={null}\n{\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PermissionRequest\",\n \"decision\": {\n \"behavior\": \"allow\",\n \"updatedInput\": {\n \"command\": \"npm run lint\"\n }\n }\n }\n}\n```\n\n### PostToolUse\n\nRuns immediately after a tool completes successfully.\n\nMatches on tool name, same values as PreToolUse.\n\n#### PostToolUse input\n\n`PostToolUse` hooks fire after a tool has already executed successfully. The input includes both `tool_input`, the arguments sent to the tool, and `tool_response`, the result it returned. The exact schema for both depends on the tool.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"PostToolUse\",\n \"tool_name\": \"Write\",\n \"tool_input\": {\n \"file_path\": \"/path/to/file.txt\",\n \"content\": \"file content\"\n },\n \"tool_response\": {\n \"filePath\": \"/path/to/file.txt\",\n \"success\": true\n },\n \"tool_use_id\": \"toolu_01ABC123...\"\n}\n```\n\n#### PostToolUse decision control\n\n`PostToolUse` hooks can provide feedback to Claude after tool execution. In addition to the [JSON output fields](#json-output) available to all hooks, your hook script can return these event-specific fields:\n\n| Field | Description |\n| :--------------------- | :----------------------------------------------------------------------------------------- |\n| `decision` | `\"block\"` prompts Claude with the `reason`. Omit to allow the action to proceed |\n| `reason` | Explanation shown to Claude when `decision` is `\"block\"` |\n| `additionalContext` | Additional context for Claude to consider |\n| `updatedMCPToolOutput` | For [MCP tools](#match-mcp-tools) only: replaces the tool's output with the provided value |\n\n```json theme={null}\n{\n \"decision\": \"block\",\n \"reason\": \"Explanation for decision\",\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PostToolUse\",\n \"additionalContext\": \"Additional information for Claude\"\n }\n}\n```\n\n### PostToolUseFailure\n\nRuns when a tool execution fails. This event fires for tool calls that throw errors or return failure results. Use this to log failures, send alerts, or provide corrective feedback to Claude.\n\nMatches on tool name, same values as PreToolUse.\n\n#### PostToolUseFailure input\n\nPostToolUseFailure hooks receive the same `tool_name` and `tool_input` fields as PostToolUse, along with error information as top-level fields:\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"PostToolUseFailure\",\n \"tool_name\": \"Bash\",\n \"tool_input\": {\n \"command\": \"npm test\",\n \"description\": \"Run test suite\"\n },\n \"tool_use_id\": \"toolu_01ABC123...\",\n \"error\": \"Command exited with non-zero status code 1\",\n \"is_interrupt\": false\n}\n```\n\n| Field | Description |\n| :------------- | :------------------------------------------------------------------------------ |\n| `error` | String describing what went wrong |\n| `is_interrupt` | Optional boolean indicating whether the failure was caused by user interruption |\n\n#### PostToolUseFailure decision control\n\n`PostToolUseFailure` hooks can provide context to Claude after a tool failure. In addition to the [JSON output fields](#json-output) available to all hooks, your hook script can return these event-specific fields:\n\n| Field | Description |\n| :------------------ | :------------------------------------------------------------ |\n| `additionalContext` | Additional context for Claude to consider alongside the error |\n\n```json theme={null}\n{\n \"hookSpecificOutput\": {\n \"hookEventName\": \"PostToolUseFailure\",\n \"additionalContext\": \"Additional information about the failure for Claude\"\n }\n}\n```\n\n### Notification\n\nRuns when Claude Code sends notifications. Matches on notification type: `permission_prompt`, `idle_prompt`, `auth_success`, `elicitation_dialog`. Omit the matcher to run hooks for all notification types.\n\nUse separate matchers to run different handlers depending on the notification type. This configuration triggers a permission-specific alert script when Claude needs permission approval and a different notification when Claude has been idle:\n\n```json theme={null}\n{\n \"hooks\": {\n \"Notification\": [\n {\n \"matcher\": \"permission_prompt\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"/path/to/permission-alert.sh\"\n }\n ]\n },\n {\n \"matcher\": \"idle_prompt\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"/path/to/idle-notification.sh\"\n }\n ]\n }\n ]\n }\n}\n```\n\n#### Notification input\n\nIn addition to the [common input fields](#common-input-fields), Notification hooks receive `message` with the notification text, an optional `title`, and `notification_type` indicating which type fired.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"Notification\",\n \"message\": \"Claude needs your permission to use Bash\",\n \"title\": \"Permission needed\",\n \"notification_type\": \"permission_prompt\"\n}\n```\n\nNotification hooks cannot block or modify notifications. In addition to the [JSON output fields](#json-output) available to all hooks, you can return `additionalContext` to add context to the conversation:\n\n| Field | Description |\n| :------------------ | :------------------------------- |\n| `additionalContext` | String added to Claude's context |\n\n### SubagentStart\n\nRuns when a Claude Code subagent is spawned via the Task tool. Supports matchers to filter by agent type name (built-in agents like `Bash`, `Explore`, `Plan`, or custom agent names from `.claude/agents/`).\n\n#### SubagentStart input\n\nIn addition to the [common input fields](#common-input-fields), SubagentStart hooks receive `agent_id` with the unique identifier for the subagent and `agent_type` with the agent name (built-in agents like `\"Bash\"`, `\"Explore\"`, `\"Plan\"`, or custom agent names).\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"SubagentStart\",\n \"agent_id\": \"agent-abc123\",\n \"agent_type\": \"Explore\"\n}\n```\n\nSubagentStart hooks cannot block subagent creation, but they can inject context into the subagent. In addition to the [JSON output fields](#json-output) available to all hooks, you can return:\n\n| Field | Description |\n| :------------------ | :------------------------------------- |\n| `additionalContext` | String added to the subagent's context |\n\n```json theme={null}\n{\n \"hookSpecificOutput\": {\n \"hookEventName\": \"SubagentStart\",\n \"additionalContext\": \"Follow security guidelines for this task\"\n }\n}\n```\n\n### SubagentStop\n\nRuns when a Claude Code subagent has finished responding. Matches on agent type, same values as SubagentStart.\n\n#### SubagentStop input\n\nIn addition to the [common input fields](#common-input-fields), SubagentStop hooks receive `stop_hook_active`, `agent_id`, `agent_type`, `agent_transcript_path`, and `last_assistant_message`. The `agent_type` field is the value used for matcher filtering. The `transcript_path` is the main session's transcript, while `agent_transcript_path` is the subagent's own transcript stored in a nested `subagents/` folder. The `last_assistant_message` field contains the text content of the subagent's final response, so hooks can access it without parsing the transcript file.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"~/.claude/projects/.../abc123.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"SubagentStop\",\n \"stop_hook_active\": false,\n \"agent_id\": \"def456\",\n \"agent_type\": \"Explore\",\n \"agent_transcript_path\": \"~/.claude/projects/.../abc123/subagents/agent-def456.jsonl\",\n \"last_assistant_message\": \"Analysis complete. Found 3 potential issues...\"\n}\n```\n\nSubagentStop hooks use the same decision control format as [Stop hooks](#stop-decision-control).\n\n### Stop\n\nRuns when the main Claude Code agent has finished responding. Does not run if\nthe stoppage occurred due to a user interrupt.\n\n#### Stop input\n\nIn addition to the [common input fields](#common-input-fields), Stop hooks receive `stop_hook_active` and `last_assistant_message`. The `stop_hook_active` field is `true` when Claude Code is already continuing as a result of a stop hook. Check this value or process the transcript to prevent Claude Code from running indefinitely. The `last_assistant_message` field contains the text content of Claude's final response, so hooks can access it without parsing the transcript file.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"~/.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"Stop\",\n \"stop_hook_active\": true,\n \"last_assistant_message\": \"I've completed the refactoring. Here's a summary...\"\n}\n```\n\n#### Stop decision control\n\n`Stop` and `SubagentStop` hooks can control whether Claude continues. In addition to the [JSON output fields](#json-output) available to all hooks, your hook script can return these event-specific fields:\n\n| Field | Description |\n| :--------- | :------------------------------------------------------------------------- |\n| `decision` | `\"block\"` prevents Claude from stopping. Omit to allow Claude to stop |\n| `reason` | Required when `decision` is `\"block\"`. Tells Claude why it should continue |\n\n```json theme={null}\n{\n \"decision\": \"block\",\n \"reason\": \"Must be provided when Claude is blocked from stopping\"\n}\n```\n\n### TeammateIdle\n\nRuns when an [agent team](/en/agent-teams) teammate is about to go idle after finishing its turn. Use this to enforce quality gates before a teammate stops working, such as requiring passing lint checks or verifying that output files exist.\n\nWhen a `TeammateIdle` hook exits with code 2, the teammate receives the stderr message as feedback and continues working instead of going idle. TeammateIdle hooks do not support matchers and fire on every occurrence.\n\n#### TeammateIdle input\n\nIn addition to the [common input fields](#common-input-fields), TeammateIdle hooks receive `teammate_name` and `team_name`.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"TeammateIdle\",\n \"teammate_name\": \"researcher\",\n \"team_name\": \"my-project\"\n}\n```\n\n| Field | Description |\n| :-------------- | :-------------------------------------------- |\n| `teammate_name` | Name of the teammate that is about to go idle |\n| `team_name` | Name of the team |\n\n#### TeammateIdle decision control\n\nTeammateIdle hooks use exit codes only, not JSON decision control. This example checks that a build artifact exists before allowing a teammate to go idle:\n\n```bash theme={null}\n#!/bin/bash\n\nif [ ! -f \"./dist/output.js\" ]; then\n echo \"Build artifact missing. Run the build before stopping.\" >&2\n exit 2\nfi\n\nexit 0\n```\n\n### TaskCompleted\n\nRuns when a task is being marked as completed. This fires in two situations: when any agent explicitly marks a task as completed through the TaskUpdate tool, or when an [agent team](/en/agent-teams) teammate finishes its turn with in-progress tasks. Use this to enforce completion criteria like passing tests or lint checks before a task can close.\n\nWhen a `TaskCompleted` hook exits with code 2, the task is not marked as completed and the stderr message is fed back to the model as feedback. TaskCompleted hooks do not support matchers and fire on every occurrence.\n\n#### TaskCompleted input\n\nIn addition to the [common input fields](#common-input-fields), TaskCompleted hooks receive `task_id`, `task_subject`, and optionally `task_description`, `teammate_name`, and `team_name`.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"TaskCompleted\",\n \"task_id\": \"task-001\",\n \"task_subject\": \"Implement user authentication\",\n \"task_description\": \"Add login and signup endpoints\",\n \"teammate_name\": \"implementer\",\n \"team_name\": \"my-project\"\n}\n```\n\n| Field | Description |\n| :----------------- | :------------------------------------------------------ |\n| `task_id` | Identifier of the task being completed |\n| `task_subject` | Title of the task |\n| `task_description` | Detailed description of the task. May be absent |\n| `teammate_name` | Name of the teammate completing the task. May be absent |\n| `team_name` | Name of the team. May be absent |\n\n#### TaskCompleted decision control\n\nTaskCompleted hooks use exit codes only, not JSON decision control. This example runs tests and blocks task completion if they fail:\n\n```bash theme={null}\n#!/bin/bash\nINPUT=$(cat)\nTASK_SUBJECT=$(echo \"$INPUT\" | jq -r '.task_subject')\n\n# Run the test suite\nif ! npm test 2>&1; then\n echo \"Tests not passing. Fix failing tests before completing: $TASK_SUBJECT\" >&2\n exit 2\nfi\n\nexit 0\n```\n\n### ConfigChange\n\nRuns when a configuration file changes during a session. Use this to audit settings changes, enforce security policies, or block unauthorized modifications to configuration files.\n\nConfigChange hooks fire for changes to settings files, managed policy settings, and skill files. The `source` field in the input tells you which type of configuration changed, and the optional `file_path` field provides the path to the changed file.\n\nThe matcher filters on the configuration source:\n\n| Matcher | When it fires |\n| :----------------- | :---------------------------------------- |\n| `user_settings` | `~/.claude/settings.json` changes |\n| `project_settings` | `.claude/settings.json` changes |\n| `local_settings` | `.claude/settings.local.json` changes |\n| `policy_settings` | Managed policy settings change |\n| `skills` | A skill file in `.claude/skills/` changes |\n\nThis example logs all configuration changes for security auditing:\n\n```json theme={null}\n{\n \"hooks\": {\n \"ConfigChange\": [\n {\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"\\\"$CLAUDE_PROJECT_DIR\\\"/.claude/hooks/audit-config-change.sh\"\n }\n ]\n }\n ]\n }\n}\n```\n\n#### ConfigChange input\n\nIn addition to the [common input fields](#common-input-fields), ConfigChange hooks receive `source` and optionally `file_path`. The `source` field indicates which configuration type changed, and `file_path` provides the path to the specific file that was modified.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"ConfigChange\",\n \"source\": \"project_settings\",\n \"file_path\": \"/Users/.../my-project/.claude/settings.json\"\n}\n```\n\n#### ConfigChange decision control\n\nConfigChange hooks can block configuration changes from taking effect. Use exit code 2 or a JSON `decision` to prevent the change. When blocked, the new settings are not applied to the running session.\n\n| Field | Description |\n| :--------- | :--------------------------------------------------------------------------------------- |\n| `decision` | `\"block\"` prevents the configuration change from being applied. Omit to allow the change |\n| `reason` | Explanation shown to the user when `decision` is `\"block\"` |\n\n```json theme={null}\n{\n \"decision\": \"block\",\n \"reason\": \"Configuration changes to project settings require admin approval\"\n}\n```\n\n`policy_settings` changes cannot be blocked. Hooks still fire for `policy_settings` sources, so you can use them for audit logging, but any blocking decision is ignored. This ensures enterprise-managed settings always take effect.\n\n### WorktreeCreate\n\nWhen you run `claude --worktree` or a [subagent uses `isolation: \"worktree\"`](/en/sub-agents#choose-the-subagent-scope), Claude Code creates an isolated working copy using `git worktree`. If you configure a WorktreeCreate hook, it replaces the default git behavior, letting you use a different version control system like SVN, Perforce, or Mercurial.\n\nThe hook must print the absolute path to the created worktree directory on stdout. Claude Code uses this path as the working directory for the isolated session.\n\nThis example creates an SVN working copy and prints the path for Claude Code to use. Replace the repository URL with your own:\n\n```json theme={null}\n{\n \"hooks\": {\n \"WorktreeCreate\": [\n {\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"bash -c 'NAME=$(jq -r .name); DIR=\\\"$HOME/.claude/worktrees/$NAME\\\"; svn checkout https://svn.example.com/repo/trunk \\\"$DIR\\\" >&2 && echo \\\"$DIR\\\"'\"\n }\n ]\n }\n ]\n }\n}\n```\n\nThe hook reads the worktree `name` from the JSON input on stdin, checks out a fresh copy into a new directory, and prints the directory path. The `echo` on the last line is what Claude Code reads as the worktree path. Redirect any other output to stderr so it doesn't interfere with the path.\n\n#### WorktreeCreate input\n\nIn addition to the [common input fields](#common-input-fields), WorktreeCreate hooks receive the `name` field. This is a slug identifier for the new worktree, either specified by the user or auto-generated (for example, `bold-oak-a3f2`).\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"hook_event_name\": \"WorktreeCreate\",\n \"name\": \"feature-auth\"\n}\n```\n\n#### WorktreeCreate output\n\nThe hook must print the absolute path to the created worktree directory on stdout. If the hook fails or produces no output, worktree creation fails with an error.\n\nWorktreeCreate hooks do not use the standard allow/block decision model. Instead, the hook's success or failure determines the outcome. Only `type: \"command\"` hooks are supported.\n\n### WorktreeRemove\n\nThe cleanup counterpart to [WorktreeCreate](#worktreecreate). This hook fires when a worktree is being removed, either when you exit a `--worktree` session and choose to remove it, or when a subagent with `isolation: \"worktree\"` finishes. For git-based worktrees, Claude handles cleanup automatically with `git worktree remove`. If you configured a WorktreeCreate hook for a non-git version control system, pair it with a WorktreeRemove hook to handle cleanup. Without one, the worktree directory is left on disk.\n\nClaude Code passes the path that WorktreeCreate printed on stdout as `worktree_path` in the hook input. This example reads that path and removes the directory:\n\n```json theme={null}\n{\n \"hooks\": {\n \"WorktreeRemove\": [\n {\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"bash -c 'jq -r .worktree_path | xargs rm -rf'\"\n }\n ]\n }\n ]\n }\n}\n```\n\n#### WorktreeRemove input\n\nIn addition to the [common input fields](#common-input-fields), WorktreeRemove hooks receive the `worktree_path` field, which is the absolute path to the worktree being removed.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"hook_event_name\": \"WorktreeRemove\",\n \"worktree_path\": \"/Users/.../my-project/.claude/worktrees/feature-auth\"\n}\n```\n\nWorktreeRemove hooks have no decision control. They cannot block worktree removal but can perform cleanup tasks like removing version control state or archiving changes. Hook failures are logged in debug mode only. Only `type: \"command\"` hooks are supported.\n\n### PreCompact\n\nRuns before Claude Code is about to run a compact operation.\n\nThe matcher value indicates whether compaction was triggered manually or automatically:\n\n| Matcher | When it fires |\n| :------- | :------------------------------------------- |\n| `manual` | `/compact` |\n| `auto` | Auto-compact when the context window is full |\n\n#### PreCompact input\n\nIn addition to the [common input fields](#common-input-fields), PreCompact hooks receive `trigger` and `custom_instructions`. For `manual`, `custom_instructions` contains what the user passes into `/compact`. For `auto`, `custom_instructions` is empty.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"PreCompact\",\n \"trigger\": \"manual\",\n \"custom_instructions\": \"\"\n}\n```\n\n### SessionEnd\n\nRuns when a Claude Code session ends. Useful for cleanup tasks, logging session\nstatistics, or saving session state. Supports matchers to filter by exit reason.\n\nThe `reason` field in the hook input indicates why the session ended:\n\n| Reason | Description |\n| :---------------------------- | :----------------------------------------- |\n| `clear` | Session cleared with `/clear` command |\n| `logout` | User logged out |\n| `prompt_input_exit` | User exited while prompt input was visible |\n| `bypass_permissions_disabled` | Bypass permissions mode was disabled |\n| `other` | Other exit reasons |\n\n#### SessionEnd input\n\nIn addition to the [common input fields](#common-input-fields), SessionEnd hooks receive a `reason` field indicating why the session ended. See the [reason table](#sessionend) above for all values.\n\n```json theme={null}\n{\n \"session_id\": \"abc123\",\n \"transcript_path\": \"/Users/.../.claude/projects/.../00893aaf-19fa-41d2-8238-13269b9b3ca0.jsonl\",\n \"cwd\": \"/Users/...\",\n \"permission_mode\": \"default\",\n \"hook_event_name\": \"SessionEnd\",\n \"reason\": \"other\"\n}\n```\n\nSessionEnd hooks have no decision control. They cannot block session termination but can perform cleanup tasks.\n\n## Prompt-based hooks\n\nIn addition to Bash command hooks (`type: \"command\"`), Claude Code supports prompt-based hooks (`type: \"prompt\"`) that use an LLM to evaluate whether to allow or block an action, and agent hooks (`type: \"agent\"`) that spawn an agentic verifier with tool access. Not all events support every hook type.\n\nEvents that support all three hook types (`command`, `prompt`, and `agent`):\n\n* `PermissionRequest`\n* `PostToolUse`\n* `PostToolUseFailure`\n* `PreToolUse`\n* `Stop`\n* `SubagentStop`\n* `TaskCompleted`\n* `UserPromptSubmit`\n\nEvents that only support `type: \"command\"` hooks:\n\n* `ConfigChange`\n* `Notification`\n* `PreCompact`\n* `SessionEnd`\n* `SessionStart`\n* `SubagentStart`\n* `TeammateIdle`\n* `WorktreeCreate`\n* `WorktreeRemove`\n\n### How prompt-based hooks work\n\nInstead of executing a Bash command, prompt-based hooks:\n\n1. Send the hook input and your prompt to a Claude model, Haiku by default\n2. The LLM responds with structured JSON containing a decision\n3. Claude Code processes the decision automatically\n\n### Prompt hook configuration\n\nSet `type` to `\"prompt\"` and provide a `prompt` string instead of a `command`. Use the `$ARGUMENTS` placeholder to inject the hook's JSON input data into your prompt text. Claude Code sends the combined prompt and input to a fast Claude model, which returns a JSON decision.\n\nThis `Stop` hook asks the LLM to evaluate whether all tasks are complete before allowing Claude to finish:\n\n```json theme={null}\n{\n \"hooks\": {\n \"Stop\": [\n {\n \"hooks\": [\n {\n \"type\": \"prompt\",\n \"prompt\": \"Evaluate if Claude should stop: $ARGUMENTS. Check if all tasks are complete.\"\n }\n ]\n }\n ]\n }\n}\n```\n\n| Field | Required | Description |\n| :-------- | :------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| `type` | yes | Must be `\"prompt\"` |\n| `prompt` | yes | The prompt text to send to the LLM. Use `$ARGUMENTS` as a placeholder for the hook input JSON. If `$ARGUMENTS` is not present, input JSON is appended to the prompt |\n| `model` | no | Model to use for evaluation. Defaults to a fast model |\n| `timeout` | no | Timeout in seconds. Default: 30 |\n\n### Response schema\n\nThe LLM must respond with JSON containing:\n\n```json theme={null}\n{\n \"ok\": true | false,\n \"reason\": \"Explanation for the decision\"\n}\n```\n\n| Field | Description |\n| :------- | :--------------------------------------------------------- |\n| `ok` | `true` allows the action, `false` prevents it |\n| `reason` | Required when `ok` is `false`. Explanation shown to Claude |\n\n### Example: Multi-criteria Stop hook\n\nThis `Stop` hook uses a detailed prompt to check three conditions before allowing Claude to stop. If `\"ok\"` is `false`, Claude continues working with the provided reason as its next instruction. `SubagentStop` hooks use the same format to evaluate whether a [subagent](/en/sub-agents) should stop:\n\n```json theme={null}\n{\n \"hooks\": {\n \"Stop\": [\n {\n \"hooks\": [\n {\n \"type\": \"prompt\",\n \"prompt\": \"You are evaluating whether Claude should stop working. Context: $ARGUMENTS\\n\\nAnalyze the conversation and determine if:\\n1. All user-requested tasks are complete\\n2. Any errors need to be addressed\\n3. Follow-up work is needed\\n\\nRespond with JSON: {\\\"ok\\\": true} to allow stopping, or {\\\"ok\\\": false, \\\"reason\\\": \\\"your explanation\\\"} to continue working.\",\n \"timeout\": 30\n }\n ]\n }\n ]\n }\n}\n```\n\n## Agent-based hooks\n\nAgent-based hooks (`type: \"agent\"`) are like prompt-based hooks but with multi-turn tool access. Instead of a single LLM call, an agent hook spawns a subagent that can read files, search code, and inspect the codebase to verify conditions. Agent hooks support the same events as prompt-based hooks.\n\n### How agent hooks work\n\nWhen an agent hook fires:\n\n1. Claude Code spawns a subagent with your prompt and the hook's JSON input\n2. The subagent can use tools like Read, Grep, and Glob to investigate\n3. After up to 50 turns, the subagent returns a structured `{ \"ok\": true/false }` decision\n4. Claude Code processes the decision the same way as a prompt hook\n\nAgent hooks are useful when verification requires inspecting actual files or test output, not just evaluating the hook input data alone.\n\n### Agent hook configuration\n\nSet `type` to `\"agent\"` and provide a `prompt` string. The configuration fields are the same as [prompt hooks](#prompt-hook-configuration), with a longer default timeout:\n\n| Field | Required | Description |\n| :-------- | :------- | :------------------------------------------------------------------------------------------ |\n| `type` | yes | Must be `\"agent\"` |\n| `prompt` | yes | Prompt describing what to verify. Use `$ARGUMENTS` as a placeholder for the hook input JSON |\n| `model` | no | Model to use. Defaults to a fast model |\n| `timeout` | no | Timeout in seconds. Default: 60 |\n\nThe response schema is the same as prompt hooks: `{ \"ok\": true }` to allow or `{ \"ok\": false, \"reason\": \"...\" }` to block.\n\nThis `Stop` hook verifies that all unit tests pass before allowing Claude to finish:\n\n```json theme={null}\n{\n \"hooks\": {\n \"Stop\": [\n {\n \"hooks\": [\n {\n \"type\": \"agent\",\n \"prompt\": \"Verify that all unit tests pass. Run the test suite and check the results. $ARGUMENTS\",\n \"timeout\": 120\n }\n ]\n }\n ]\n }\n}\n```\n\n## Run hooks in the background\n\nBy default, hooks block Claude's execution until they complete. For long-running tasks like deployments, test suites, or external API calls, set `\"async\": true` to run the hook in the background while Claude continues working. Async hooks cannot block or control Claude's behavior: response fields like `decision`, `permissionDecision`, and `continue` have no effect, because the action they would have controlled has already completed.\n\n### Configure an async hook\n\nAdd `\"async\": true` to a command hook's configuration to run it in the background without blocking Claude. This field is only available on `type: \"command\"` hooks.\n\nThis hook runs a test script after every `Write` tool call. Claude continues working immediately while `run-tests.sh` executes for up to 120 seconds. When the script finishes, its output is delivered on the next conversation turn:\n\n```json theme={null}\n{\n \"hooks\": {\n \"PostToolUse\": [\n {\n \"matcher\": \"Write\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"/path/to/run-tests.sh\",\n \"async\": true,\n \"timeout\": 120\n }\n ]\n }\n ]\n }\n}\n```\n\nThe `timeout` field sets the maximum time in seconds for the background process. If not specified, async hooks use the same 10-minute default as sync hooks.\n\n### How async hooks execute\n\nWhen an async hook fires, Claude Code starts the hook process and immediately continues without waiting for it to finish. The hook receives the same JSON input via stdin as a synchronous hook.\n\nAfter the background process exits, if the hook produced a JSON response with a `systemMessage` or `additionalContext` field, that content is delivered to Claude as context on the next conversation turn.\n\n### Example: run tests after file changes\n\nThis hook starts a test suite in the background whenever Claude writes a file, then reports the results back to Claude when the tests finish. Save this script to `.claude/hooks/run-tests-async.sh` in your project and make it executable with `chmod +x`:\n\n```bash theme={null}\n#!/bin/bash\n# run-tests-async.sh\n\n# Read hook input from stdin\nINPUT=$(cat)\nFILE_PATH=$(echo \"$INPUT\" | jq -r '.tool_input.file_path // empty')\n\n# Only run tests for source files\nif [[ \"$FILE_PATH\" != *.ts && \"$FILE_PATH\" != *.js ]]; then\n exit 0\nfi\n\n# Run tests and report results via systemMessage\nRESULT=$(npm test 2>&1)\nEXIT_CODE=$?\n\nif [ $EXIT_CODE -eq 0 ]; then\n echo \"{\\\"systemMessage\\\": \\\"Tests passed after editing $FILE_PATH\\\"}\"\nelse\n echo \"{\\\"systemMessage\\\": \\\"Tests failed after editing $FILE_PATH: $RESULT\\\"}\"\nfi\n```\n\nThen add this configuration to `.claude/settings.json` in your project root. The `async: true` flag lets Claude keep working while tests run:\n\n```json theme={null}\n{\n \"hooks\": {\n \"PostToolUse\": [\n {\n \"matcher\": \"Write|Edit\",\n \"hooks\": [\n {\n \"type\": \"command\",\n \"command\": \"\\\"$CLAUDE_PROJECT_DIR\\\"/.claude/hooks/run-tests-async.sh\",\n \"async\": true,\n \"timeout\": 300\n }\n ]\n }\n ]\n }\n}\n```\n\n### Limitations\n\nAsync hooks have several constraints compared to synchronous hooks:\n\n* Only `type: \"command\"` hooks support `async`. Prompt-based hooks cannot run asynchronously.\n* Async hooks cannot block tool calls or return decisions. By the time the hook completes, the triggering action has already proceeded.\n* Hook output is delivered on the next conversation turn. If the session is idle, the response waits until the next user interaction.\n* Each execution creates a separate background process. There is no deduplication across multiple firings of the same async hook.\n\n## Security considerations\n\n### Disclaimer\n\nHooks run with your system user's full permissions.\n\n\n Hooks execute shell commands with your full user permissions. They can modify, delete, or access any files your user account can access. Review and test all hook commands before adding them to your configuration.\n\n\n### Security best practices\n\nKeep these practices in mind when writing hooks:\n\n* **Validate and sanitize inputs**: never trust input data blindly\n* **Always quote shell variables**: use `\"$VAR\"` not `$VAR`\n* **Block path traversal**: check for `..` in file paths\n* **Use absolute paths**: specify full paths for scripts, using `\"$CLAUDE_PROJECT_DIR\"` for the project root\n* **Skip sensitive files**: avoid `.env`, `.git/`, keys, etc.\n\n## Debug hooks\n\nRun `claude --debug` to see hook execution details, including which hooks matched, their exit codes, and output. Toggle verbose mode with `Ctrl+O` to see hook progress in the transcript.\n\n```\n[DEBUG] Executing hooks for PostToolUse:Write\n[DEBUG] Getting matching hook commands for PostToolUse with query: Write\n[DEBUG] Found 1 hook matchers in settings\n[DEBUG] Matched 1 hooks for query \"Write\"\n[DEBUG] Found 1 hook commands to execute\n[DEBUG] Executing hook command: with timeout 600000ms\n[DEBUG] Hook command completed with status 0: \n```\n\nFor troubleshooting common issues like hooks not firing, infinite Stop hook loops, or configuration errors, see [Limitations and troubleshooting](/en/hooks-guide#limitations-and-troubleshooting) in the guide.\n"}]},"uuid":"e1523fbb-98dd-43c7-8458-36939a1bcad5","timestamp":"2026-02-23T18:22:06.118Z","sourceToolAssistantUUID":"2da657ce-8bdb-4262-9950-514bd22f3d05"} 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{"parentUuid":"23b785d4-331d-45a3-9058-cb937825696a","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PhxUrew1gKvhB8wb5xDKaY","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# Connect Claude Code to tools via MCP\n\n> Learn how to connect Claude Code to your tools with the Model Context Protocol.\n\nexport const MCPServersTable = ({platform = \"all\"}) => {\n const ifYouAreAnAiAgentReadingThisYouShouldInsteadFetch = 'https://api.anthropic.com/mcp-registry/docs';\n const [servers, setServers] = useState([]);\n const [loading, setLoading] = useState(true);\n const [error, setError] = useState(null);\n useEffect(() => {\n const fetchServers = async () => {\n try {\n setLoading(true);\n const allServers = [];\n let cursor = null;\n do {\n const url = new URL('https://api.anthropic.com/mcp-registry/v0/servers');\n url.searchParams.set('version', 'latest');\n url.searchParams.set('visibility', 'commercial');\n url.searchParams.set('limit', '100');\n if (cursor) {\n url.searchParams.set('cursor', cursor);\n }\n const response = await fetch(url);\n if (!response.ok) {\n throw new Error(`Failed to fetch MCP registry: ${response.status}`);\n }\n const data = await response.json();\n allServers.push(...data.servers);\n cursor = data.metadata?.nextCursor || null;\n } while (cursor);\n const transformedServers = allServers.map(item => {\n const server = item.server;\n const meta = item._meta?.['com.anthropic.api/mcp-registry'] || ({});\n const worksWith = meta.worksWith || [];\n const availability = {\n claudeCode: worksWith.includes('claude-code'),\n mcpConnector: worksWith.includes('claude-api'),\n claudeDesktop: worksWith.includes('claude-desktop')\n };\n const remotes = server.remotes || [];\n const httpRemote = remotes.find(r => r.type === 'streamable-http');\n const sseRemote = remotes.find(r => r.type === 'sse');\n const preferredRemote = httpRemote || sseRemote;\n const remoteUrl = preferredRemote?.url || meta.url;\n const remoteType = preferredRemote?.type;\n const isTemplatedUrl = remoteUrl?.includes('{');\n let setupUrl;\n if (isTemplatedUrl && meta.requiredFields) {\n const urlField = meta.requiredFields.find(f => f.field === 'url');\n setupUrl = urlField?.sourceUrl || meta.documentation;\n }\n const urls = {};\n if (!isTemplatedUrl) {\n if (remoteType === 'streamable-http') {\n urls.http = remoteUrl;\n } else if (remoteType === 'sse') {\n urls.sse = remoteUrl;\n }\n }\n let envVars = [];\n if (server.packages && server.packages.length > 0) {\n const npmPackage = server.packages.find(p => p.registryType === 'npm');\n if (npmPackage) {\n urls.stdio = `npx -y ${npmPackage.identifier}`;\n if (npmPackage.environmentVariables) {\n envVars = npmPackage.environmentVariables;\n }\n }\n }\n return {\n name: meta.displayName || server.title || server.name,\n description: meta.oneLiner || server.description,\n documentation: meta.documentation,\n urls: urls,\n envVars: envVars,\n availability: availability,\n customCommands: meta.claudeCodeCopyText ? {\n claudeCode: meta.claudeCodeCopyText\n } : undefined,\n setupUrl: setupUrl\n };\n });\n setServers(transformedServers);\n setError(null);\n } catch (err) {\n setError(err.message);\n console.error('Error fetching MCP registry:', err);\n } finally {\n setLoading(false);\n }\n };\n fetchServers();\n }, []);\n const generateClaudeCodeCommand = server => {\n if (server.customCommands && server.customCommands.claudeCode) {\n return server.customCommands.claudeCode;\n }\n const serverSlug = server.name.toLowerCase().replace(/[^a-z0-9]/g, '-');\n if (server.urls.http) {\n return `claude mcp add ${serverSlug} --transport http ${server.urls.http}`;\n }\n if (server.urls.sse) {\n return `claude mcp add ${serverSlug} --transport sse ${server.urls.sse}`;\n }\n if (server.urls.stdio) {\n const envFlags = server.envVars && server.envVars.length > 0 ? server.envVars.map(v => `--env ${v.name}=YOUR_${v.name}`).join(' ') : '';\n const baseCommand = `claude mcp add ${serverSlug} --transport stdio`;\n return envFlags ? `${baseCommand} ${envFlags} -- ${server.urls.stdio}` : `${baseCommand} -- ${server.urls.stdio}`;\n }\n return null;\n };\n if (loading) {\n return
Loading MCP servers...
;\n }\n if (error) {\n return
Error loading MCP servers: {error}
;\n }\n const filteredServers = servers.filter(server => {\n if (platform === \"claudeCode\") {\n return server.availability.claudeCode;\n } else if (platform === \"mcpConnector\") {\n return server.availability.mcpConnector;\n } else if (platform === \"claudeDesktop\") {\n return server.availability.claudeDesktop;\n } else if (platform === \"all\") {\n return true;\n } else {\n throw new Error(`Unknown platform: ${platform}`);\n }\n });\n return <>\n \n\n
\n {filteredServers.map(server => {\n const claudeCodeCommand = generateClaudeCodeCommand(server);\n const mcpUrl = server.urls.http || server.urls.sse;\n const commandToShow = platform === \"claudeCode\" ? claudeCodeCommand : mcpUrl;\n return
\n
\n {server.documentation ? \n {server.name}\n : {server.name}}\n
\n\n

\n {server.description}\n

\n\n {server.setupUrl &&

\n Requires user-specific URL.{' '}\n \n Get your URL here\n .\n

}\n\n {commandToShow && !server.setupUrl && <>\n

\n {platform === \"claudeCode\" ? \"Command\" : \"URL\"}\n

\n
\n \n {commandToShow}\n \n
\n }\n
;\n })}\n
\n ;\n};\n\nClaude Code can connect to hundreds of external tools and data sources through the [Model Context Protocol (MCP)](https://modelcontextprotocol.io/introduction), an open source standard for AI-tool integrations. MCP servers give Claude Code access to your tools, databases, and APIs.\n\n## What you can do with MCP\n\nWith MCP servers connected, you can ask Claude Code to:\n\n* **Implement features from issue trackers**: \"Add the feature described in JIRA issue ENG-4521 and create a PR on GitHub.\"\n* **Analyze monitoring data**: \"Check Sentry and Statsig to check the usage of the feature described in ENG-4521.\"\n* **Query databases**: \"Find emails of 10 random users who used feature ENG-4521, based on our PostgreSQL database.\"\n* **Integrate designs**: \"Update our standard email template based on the new Figma designs that were posted in Slack\"\n* **Automate workflows**: \"Create Gmail drafts inviting these 10 users to a feedback session about the new feature.\"\n\n## Popular MCP servers\n\nHere are some commonly used MCP servers you can connect to Claude Code:\n\n\n Use third party MCP servers at your own risk - Anthropic has not verified\n the correctness or security of all these servers.\n Make sure you trust MCP servers you are installing.\n Be especially careful when using MCP servers that could fetch untrusted\n content, as these can expose you to prompt injection risk.\n\n\n\n\n\n **Need a specific integration?** [Find hundreds more MCP servers on GitHub](https://github.com/modelcontextprotocol/servers), or build your own using the [MCP SDK](https://modelcontextprotocol.io/quickstart/server).\n\n\n## Installing MCP servers\n\nMCP servers can be configured in three different ways depending on your needs:\n\n### Option 1: Add a remote HTTP server\n\nHTTP servers are the recommended option for connecting to remote MCP servers. This is the most widely supported transport for cloud-based services.\n\n```bash theme={null}\n# Basic syntax\nclaude mcp add --transport http \n\n# Real example: Connect to Notion\nclaude mcp add --transport http notion https://mcp.notion.com/mcp\n\n# Example with Bearer token\nclaude mcp add --transport http secure-api https://api.example.com/mcp \\\n --header \"Authorization: Bearer your-token\"\n```\n\n### Option 2: Add a remote SSE server\n\n\n The SSE (Server-Sent Events) transport is deprecated. Use HTTP servers instead, where available.\n\n\n```bash theme={null}\n# Basic syntax\nclaude mcp add --transport sse \n\n# Real example: Connect to Asana\nclaude mcp add --transport sse asana https://mcp.asana.com/sse\n\n# Example with authentication header\nclaude mcp add --transport sse private-api https://api.company.com/sse \\\n --header \"X-API-Key: your-key-here\"\n```\n\n### Option 3: Add a local stdio server\n\nStdio servers run as local processes on your machine. They're ideal for tools that need direct system access or custom scripts.\n\n```bash theme={null}\n# Basic syntax\nclaude mcp add [options] -- [args...]\n\n# Real example: Add Airtable server\nclaude mcp add --transport stdio --env AIRTABLE_API_KEY=YOUR_KEY airtable \\\n -- npx -y airtable-mcp-server\n```\n\n\n **Important: Option ordering**\n\n All options (`--transport`, `--env`, `--scope`, `--header`) must come **before** the server name. The `--` (double dash) then separates the server name from the command and arguments that get passed to the MCP server.\n\n For example:\n\n * `claude mcp add --transport stdio myserver -- npx server` → runs `npx server`\n * `claude mcp add --transport stdio --env KEY=value myserver -- python server.py --port 8080` → runs `python server.py --port 8080` with `KEY=value` in environment\n\n This prevents conflicts between Claude's flags and the server's flags.\n\n\n### Managing your servers\n\nOnce configured, you can manage your MCP servers with these commands:\n\n```bash theme={null}\n# List all configured servers\nclaude mcp list\n\n# Get details for a specific server\nclaude mcp get github\n\n# Remove a server\nclaude mcp remove github\n\n# (within Claude Code) Check server status\n/mcp\n```\n\n### Dynamic tool updates\n\nClaude Code supports MCP `list_changed` notifications, allowing MCP servers to dynamically update their available tools, prompts, and resources without requiring you to disconnect and reconnect. When an MCP server sends a `list_changed` notification, Claude Code automatically refreshes the available capabilities from that server.\n\n\n Tips:\n\n * Use the `--scope` flag to specify where the configuration is stored:\n * `local` (default): Available only to you in the current project (was called `project` in older versions)\n * `project`: Shared with everyone in the project via `.mcp.json` file\n * `user`: Available to you across all projects (was called `global` in older versions)\n * Set environment variables with `--env` flags (for example, `--env KEY=value`)\n * Configure MCP server startup timeout using the MCP\\_TIMEOUT environment variable (for example, `MCP_TIMEOUT=10000 claude` sets a 10-second timeout)\n * Claude Code will display a warning when MCP tool output exceeds 10,000 tokens. To increase this limit, set the `MAX_MCP_OUTPUT_TOKENS` environment variable (for example, `MAX_MCP_OUTPUT_TOKENS=50000`)\n * Use `/mcp` to authenticate with remote servers that require OAuth 2.0 authentication\n\n\n\n **Windows Users**: On native Windows (not WSL), local MCP servers that use `npx` require the `cmd /c` wrapper to ensure proper execution.\n\n ```bash theme={null}\n # This creates command=\"cmd\" which Windows can execute\n claude mcp add --transport stdio my-server -- cmd /c npx -y @some/package\n ```\n\n Without the `cmd /c` wrapper, you'll encounter \"Connection closed\" errors because Windows cannot directly execute `npx`. (See the note above for an explanation of the `--` parameter.)\n\n\n### Plugin-provided MCP servers\n\n[Plugins](/en/plugins) can bundle MCP servers, automatically providing tools and integrations when the plugin is enabled. Plugin MCP servers work identically to user-configured servers.\n\n**How plugin MCP servers work**:\n\n* Plugins define MCP servers in `.mcp.json` at the plugin root or inline in `plugin.json`\n* When a plugin is enabled, its MCP servers start automatically\n* Plugin MCP tools appear alongside manually configured MCP tools\n* Plugin servers are managed through plugin installation (not `/mcp` commands)\n\n**Example plugin MCP configuration**:\n\nIn `.mcp.json` at plugin root:\n\n```json theme={null}\n{\n \"database-tools\": {\n \"command\": \"${CLAUDE_PLUGIN_ROOT}/servers/db-server\",\n \"args\": [\"--config\", \"${CLAUDE_PLUGIN_ROOT}/config.json\"],\n \"env\": {\n \"DB_URL\": \"${DB_URL}\"\n }\n }\n}\n```\n\nOr inline in `plugin.json`:\n\n```json theme={null}\n{\n \"name\": \"my-plugin\",\n \"mcpServers\": {\n \"plugin-api\": {\n \"command\": \"${CLAUDE_PLUGIN_ROOT}/servers/api-server\",\n \"args\": [\"--port\", \"8080\"]\n }\n }\n}\n```\n\n**Plugin MCP features**:\n\n* **Automatic lifecycle**: Servers start when plugin enables, but you must restart Claude Code to apply MCP server changes (enabling or disabling)\n* **Environment variables**: Use `${CLAUDE_PLUGIN_ROOT}` for plugin-relative paths\n* **User environment access**: Access to same environment variables as manually configured servers\n* **Multiple transport types**: Support stdio, SSE, and HTTP transports (transport support may vary by server)\n\n**Viewing plugin MCP servers**:\n\n```bash theme={null}\n# Within Claude Code, see all MCP servers including plugin ones\n/mcp\n```\n\nPlugin servers appear in the list with indicators showing they come from plugins.\n\n**Benefits of plugin MCP servers**:\n\n* **Bundled distribution**: Tools and servers packaged together\n* **Automatic setup**: No manual MCP configuration needed\n* **Team consistency**: Everyone gets the same tools when plugin is installed\n\nSee the [plugin components reference](/en/plugins-reference#mcp-servers) for details on bundling MCP servers with plugins.\n\n## MCP installation scopes\n\nMCP servers can be configured at three different scope levels, each serving distinct purposes for managing server accessibility and sharing. Understanding these scopes helps you determine the best way to configure servers for your specific needs.\n\n### Local scope\n\nLocal-scoped servers represent the default configuration level and are stored in `~/.claude.json` under your project's path. These servers remain private to you and are only accessible when working within the current project directory. This scope is ideal for personal development servers, experimental configurations, or servers containing sensitive credentials that shouldn't be shared.\n\n\n The term \"local scope\" for MCP servers differs from general local settings. MCP local-scoped servers are stored in `~/.claude.json` (your home directory), while general local settings use `.claude/settings.local.json` (in the project directory). See [Settings](/en/settings#settings-files) for details on settings file locations.\n\n\n```bash theme={null}\n# Add a local-scoped server (default)\nclaude mcp add --transport http stripe https://mcp.stripe.com\n\n# Explicitly specify local scope\nclaude mcp add --transport http stripe --scope local https://mcp.stripe.com\n```\n\n### Project scope\n\nProject-scoped servers enable team collaboration by storing configurations in a `.mcp.json` file at your project's root directory. This file is designed to be checked into version control, ensuring all team members have access to the same MCP tools and services. When you add a project-scoped server, Claude Code automatically creates or updates this file with the appropriate configuration structure.\n\n```bash theme={null}\n# Add a project-scoped server\nclaude mcp add --transport http paypal --scope project https://mcp.paypal.com/mcp\n```\n\nThe resulting `.mcp.json` file follows a standardized format:\n\n```json theme={null}\n{\n \"mcpServers\": {\n \"shared-server\": {\n \"command\": \"/path/to/server\",\n \"args\": [],\n \"env\": {}\n }\n }\n}\n```\n\nFor security reasons, Claude Code prompts for approval before using project-scoped servers from `.mcp.json` files. If you need to reset these approval choices, use the `claude mcp reset-project-choices` command.\n\n### User scope\n\nUser-scoped servers are stored in `~/.claude.json` and provide cross-project accessibility, making them available across all projects on your machine while remaining private to your user account. This scope works well for personal utility servers, development tools, or services you frequently use across different projects.\n\n```bash theme={null}\n# Add a user server\nclaude mcp add --transport http hubspot --scope user https://mcp.hubspot.com/anthropic\n```\n\n### Choosing the right scope\n\nSelect your scope based on:\n\n* **Local scope**: Personal servers, experimental configurations, or sensitive credentials specific to one project\n* **Project scope**: Team-shared servers, project-specific tools, or services required for collaboration\n* **User scope**: Personal utilities needed across multiple projects, development tools, or frequently used services\n\n\n **Where are MCP servers stored?**\n\n * **User and local scope**: `~/.claude.json` (in the `mcpServers` field or under project paths)\n * **Project scope**: `.mcp.json` in your project root (checked into source control)\n * **Managed**: `managed-mcp.json` in system directories (see [Managed MCP configuration](#managed-mcp-configuration))\n\n\n### Scope hierarchy and precedence\n\nMCP server configurations follow a clear precedence hierarchy. When servers with the same name exist at multiple scopes, the system resolves conflicts by prioritizing local-scoped servers first, followed by project-scoped servers, and finally user-scoped servers. This design ensures that personal configurations can override shared ones when needed.\n\n### Environment variable expansion in `.mcp.json`\n\nClaude Code supports environment variable expansion in `.mcp.json` files, allowing teams to share configurations while maintaining flexibility for machine-specific paths and sensitive values like API keys.\n\n**Supported syntax:**\n\n* `${VAR}` - Expands to the value of environment variable `VAR`\n* `${VAR:-default}` - Expands to `VAR` if set, otherwise uses `default`\n\n**Expansion locations:**\nEnvironment variables can be expanded in:\n\n* `command` - The server executable path\n* `args` - Command-line arguments\n* `env` - Environment variables passed to the server\n* `url` - For HTTP server types\n* `headers` - For HTTP server authentication\n\n**Example with variable expansion:**\n\n```json theme={null}\n{\n \"mcpServers\": {\n \"api-server\": {\n \"type\": \"http\",\n \"url\": \"${API_BASE_URL:-https://api.example.com}/mcp\",\n \"headers\": {\n \"Authorization\": \"Bearer ${API_KEY}\"\n }\n }\n }\n}\n```\n\nIf a required environment variable is not set and has no default value, Claude Code will fail to parse the config.\n\n## Practical examples\n\n{/* ### Example: Automate browser testing with Playwright\n\n ```bash\n # 1. Add the Playwright MCP server\n claude mcp add --transport stdio playwright -- npx -y @playwright/mcp@latest\n\n # 2. Write and run browser tests\n > \"Test if the login flow works with test@example.com\"\n > \"Take a screenshot of the checkout page on mobile\"\n > \"Verify that the search feature returns results\"\n ``` */}\n\n### Example: Monitor errors with Sentry\n\n```bash theme={null}\n# 1. Add the Sentry MCP server\nclaude mcp add --transport http sentry https://mcp.sentry.dev/mcp\n\n# 2. Use /mcp to authenticate with your Sentry account\n> /mcp\n\n# 3. Debug production issues\n> \"What are the most common errors in the last 24 hours?\"\n> \"Show me the stack trace for error ID abc123\"\n> \"Which deployment introduced these new errors?\"\n```\n\n### Example: Connect to GitHub for code reviews\n\n```bash theme={null}\n# 1. Add the GitHub MCP server\nclaude mcp add --transport http github https://api.githubcopilot.com/mcp/\n\n# 2. In Claude Code, authenticate if needed\n> /mcp\n# Select \"Authenticate\" for GitHub\n\n# 3. Now you can ask Claude to work with GitHub\n> \"Review PR #456 and suggest improvements\"\n> \"Create a new issue for the bug we just found\"\n> \"Show me all open PRs assigned to me\"\n```\n\n### Example: Query your PostgreSQL database\n\n```bash theme={null}\n# 1. Add the database server with your connection string\nclaude mcp add --transport stdio db -- npx -y @bytebase/dbhub \\\n --dsn \"postgresql://readonly:pass@prod.db.com:5432/analytics\"\n\n# 2. Query your database naturally\n> \"What's our total revenue this month?\"\n> \"Show me the schema for the orders table\"\n> \"Find customers who haven't made a purchase in 90 days\"\n```\n\n## Authenticate with remote MCP servers\n\nMany cloud-based MCP servers require authentication. Claude Code supports OAuth 2.0 for secure connections.\n\n\n \n For example:\n\n ```bash theme={null}\n claude mcp add --transport http sentry https://mcp.sentry.dev/mcp\n ```\n \n\n \n In Claude code, use the command:\n\n ```\n > /mcp\n ```\n\n Then follow the steps in your browser to login.\n \n\n\n\n Tips:\n\n * Authentication tokens are stored securely and refreshed automatically\n * Use \"Clear authentication\" in the `/mcp` menu to revoke access\n * If your browser doesn't open automatically, copy the provided URL\n * OAuth authentication works with HTTP servers\n\n\n### Use pre-configured OAuth credentials\n\nSome MCP servers don't support automatic OAuth setup. If you see an error like \"Incompatible auth server: does not support dynamic client registration,\" the server requires pre-configured credentials. Register an OAuth app through the server's developer portal first, then provide the credentials when adding the server.\n\n\n \n Create an app through the server's developer portal and note your client ID and client secret.\n\n Many servers also require a redirect URI. If so, choose a port and register a redirect URI in the format `http://localhost:PORT/callback`. Use that same port with `--callback-port` in the next step.\n \n\n \n Choose one of the following methods. The port used for `--callback-port` can be any available port. It just needs to match the redirect URI you registered in the previous step.\n\n \n \n Use `--client-id` to pass your app's client ID. The `--client-secret` flag prompts for the secret with masked input:\n\n ```bash theme={null}\n claude mcp add --transport http \\\n --client-id your-client-id --client-secret --callback-port 8080 \\\n my-server https://mcp.example.com/mcp\n ```\n \n\n \n Include the `oauth` object in the JSON config and pass `--client-secret` as a separate flag:\n\n ```bash theme={null}\n claude mcp add-json my-server \\\n '{\"type\":\"http\",\"url\":\"https://mcp.example.com/mcp\",\"oauth\":{\"clientId\":\"your-client-id\",\"callbackPort\":8080}}' \\\n --client-secret\n ```\n \n\n \n Set the secret via environment variable to skip the interactive prompt:\n\n ```bash theme={null}\n MCP_CLIENT_SECRET=your-secret claude mcp add --transport http \\\n --client-id your-client-id --client-secret --callback-port 8080 \\\n my-server https://mcp.example.com/mcp\n ```\n \n \n \n\n \n Run `/mcp` in Claude Code and follow the browser login flow.\n \n\n\n\n Tips:\n\n * The client secret is stored securely in your system keychain (macOS) or a credentials file, not in your config\n * If the server uses a public OAuth client with no secret, use only `--client-id` without `--client-secret`\n * These flags only apply to HTTP and SSE transports. They have no effect on stdio servers\n * Use `claude mcp get ` to verify that OAuth credentials are configured for a server\n\n\n## Add MCP servers from JSON configuration\n\nIf you have a JSON configuration for an MCP server, you can add it directly:\n\n\n \n ```bash theme={null}\n # Basic syntax\n claude mcp add-json ''\n\n # Example: Adding an HTTP server with JSON configuration\n claude mcp add-json weather-api '{\"type\":\"http\",\"url\":\"https://api.weather.com/mcp\",\"headers\":{\"Authorization\":\"Bearer token\"}}'\n\n # Example: Adding a stdio server with JSON configuration\n claude mcp add-json local-weather '{\"type\":\"stdio\",\"command\":\"/path/to/weather-cli\",\"args\":[\"--api-key\",\"abc123\"],\"env\":{\"CACHE_DIR\":\"/tmp\"}}'\n\n # Example: Adding an HTTP server with pre-configured OAuth credentials\n claude mcp add-json my-server '{\"type\":\"http\",\"url\":\"https://mcp.example.com/mcp\",\"oauth\":{\"clientId\":\"your-client-id\",\"callbackPort\":8080}}' --client-secret\n ```\n \n\n \n ```bash theme={null}\n claude mcp get weather-api\n ```\n \n\n\n\n Tips:\n\n * Make sure the JSON is properly escaped in your shell\n * The JSON must conform to the MCP server configuration schema\n * You can use `--scope user` to add the server to your user configuration instead of the project-specific one\n\n\n## Import MCP servers from Claude Desktop\n\nIf you've already configured MCP servers in Claude Desktop, you can import them:\n\n\n \n ```bash theme={null}\n # Basic syntax \n claude mcp add-from-claude-desktop \n ```\n \n\n \n After running the command, you'll see an interactive dialog that allows you to select which servers you want to import.\n \n\n \n ```bash theme={null}\n claude mcp list \n ```\n \n\n\n\n Tips:\n\n * This feature only works on macOS and Windows Subsystem for Linux (WSL)\n * It reads the Claude Desktop configuration file from its standard location on those platforms\n * Use the `--scope user` flag to add servers to your user configuration\n * Imported servers will have the same names as in Claude Desktop\n * If servers with the same names already exist, they will get a numerical suffix (for example, `server_1`)\n\n\n## Use MCP servers from Claude.ai\n\nIf you've logged into Claude Code with a [Claude.ai](https://claude.ai) account, MCP servers you've added in Claude.ai are automatically available in Claude Code:\n\n\n \n Add servers at [claude.ai/settings/connectors](https://claude.ai/settings/connectors). On Team and Enterprise plans, only admins can add servers.\n \n\n \n Complete any required authentication steps in Claude.ai.\n \n\n \n In Claude Code, use the command:\n\n ```\n # Within Claude Code, see all MCP servers including Claude.ai ones\n > /mcp\n ```\n\n Claude.ai servers appear in the list with indicators showing they come from Claude.ai.\n \n\n\n## Use Claude Code as an MCP server\n\nYou can use Claude Code itself as an MCP server that other applications can connect to:\n\n```bash theme={null}\n# Start Claude as a stdio MCP server\nclaude mcp serve\n```\n\nYou can use this in Claude Desktop by adding this configuration to claude\\_desktop\\_config.json:\n\n```json theme={null}\n{\n \"mcpServers\": {\n \"claude-code\": {\n \"type\": \"stdio\",\n \"command\": \"claude\",\n \"args\": [\"mcp\", \"serve\"],\n \"env\": {}\n }\n }\n}\n```\n\n\n **Configuring the executable path**: The `command` field must reference the Claude Code executable. If the `claude` command is not in your system's PATH, you'll need to specify the full path to the executable.\n\n To find the full path:\n\n ```bash theme={null}\n which claude\n ```\n\n Then use the full path in your configuration:\n\n ```json theme={null}\n {\n \"mcpServers\": {\n \"claude-code\": {\n \"type\": \"stdio\",\n \"command\": \"/full/path/to/claude\",\n \"args\": [\"mcp\", \"serve\"],\n \"env\": {}\n }\n }\n }\n ```\n\n Without the correct executable path, you'll encounter errors like `spawn claude ENOENT`.\n\n\n\n Tips:\n\n * The server provides access to Claude's tools like View, Edit, LS, etc.\n * In Claude Desktop, try asking Claude to read files in a directory, make edits, and more.\n * Note that this MCP server is only exposing Claude Code's tools to your MCP client, so your own client is responsible for implementing user confirmation for individual tool calls.\n\n\n## MCP output limits and warnings\n\nWhen MCP tools produce large outputs, Claude Code helps manage the token usage to prevent overwhelming your conversation context:\n\n* **Output warning threshold**: Claude Code displays a warning when any MCP tool output exceeds 10,000 tokens\n* **Configurable limit**: You can adjust the maximum allowed MCP output tokens using the `MAX_MCP_OUTPUT_TOKENS` environment variable\n* **Default limit**: The default maximum is 25,000 tokens\n\nTo increase the limit for tools that produce large outputs:\n\n```bash theme={null}\n# Set a higher limit for MCP tool outputs\nexport MAX_MCP_OUTPUT_TOKENS=50000\nclaude\n```\n\nThis is particularly useful when working with MCP servers that:\n\n* Query large datasets or databases\n* Generate detailed reports or documentation\n* Process extensive log files or debugging information\n\n\n If you frequently encounter output warnings with specific MCP servers, consider increasing the limit or configuring the server to paginate or filter its responses.\n\n\n## Use MCP resources\n\nMCP servers can expose resources that you can reference using @ mentions, similar to how you reference files.\n\n### Reference MCP resources\n\n\n \n Type `@` in your prompt to see available resources from all connected MCP servers. Resources appear alongside files in the autocomplete menu.\n \n\n \n Use the format `@server:protocol://resource/path` to reference a resource:\n\n ```\n > Can you analyze @github:issue://123 and suggest a fix?\n ```\n\n ```\n > Please review the API documentation at @docs:file://api/authentication\n ```\n \n\n \n You can reference multiple resources in a single prompt:\n\n ```\n > Compare @postgres:schema://users with @docs:file://database/user-model\n ```\n \n\n\n\n Tips:\n\n * Resources are automatically fetched and included as attachments when referenced\n * Resource paths are fuzzy-searchable in the @ mention autocomplete\n * Claude Code automatically provides tools to list and read MCP resources when servers support them\n * Resources can contain any type of content that the MCP server provides (text, JSON, structured data, etc.)\n\n\n## Scale with MCP Tool Search\n\nWhen you have many MCP servers configured, tool definitions can consume a significant portion of your context window. MCP Tool Search solves this by dynamically loading tools on-demand instead of preloading all of them.\n\n### How it works\n\nClaude Code automatically enables Tool Search when your MCP tool descriptions would consume more than 10% of the context window. You can [adjust this threshold](#configure-tool-search) or disable tool search entirely. When triggered:\n\n1. MCP tools are deferred rather than loaded into context upfront\n2. Claude uses a search tool to discover relevant MCP tools when needed\n3. Only the tools Claude actually needs are loaded into context\n4. MCP tools continue to work exactly as before from your perspective\n\n### For MCP server authors\n\nIf you're building an MCP server, the server instructions field becomes more useful with Tool Search enabled. Server instructions help Claude understand when to search for your tools, similar to how [skills](/en/skills) work.\n\nAdd clear, descriptive server instructions that explain:\n\n* What category of tasks your tools handle\n* When Claude should search for your tools\n* Key capabilities your server provides\n\n### Configure tool search\n\nTool search runs in auto mode by default, meaning it activates only when your MCP tool definitions exceed the context threshold. If you have few tools, they load normally without tool search. This feature requires models that support `tool_reference` blocks: Sonnet 4 and later, or Opus 4 and later. Haiku models do not support tool search.\n\nControl tool search behavior with the `ENABLE_TOOL_SEARCH` environment variable:\n\n| Value | Behavior |\n| :--------- | :--------------------------------------------------------------------------------- |\n| `auto` | Activates when MCP tools exceed 10% of context (default) |\n| `auto:` | Activates at custom threshold, where `` is a percentage (e.g., `auto:5` for 5%) |\n| `true` | Always enabled |\n| `false` | Disabled, all MCP tools loaded upfront |\n\n```bash theme={null}\n# Use a custom 5% threshold\nENABLE_TOOL_SEARCH=auto:5 claude\n\n# Disable tool search entirely\nENABLE_TOOL_SEARCH=false claude\n```\n\nOr set the value in your [settings.json `env` field](/en/settings#available-settings).\n\nYou can also disable the MCPSearch tool specifically using the `disallowedTools` setting:\n\n```json theme={null}\n{\n \"permissions\": {\n \"deny\": [\"MCPSearch\"]\n }\n}\n```\n\n## Use MCP prompts as commands\n\nMCP servers can expose prompts that become available as commands in Claude Code.\n\n### Execute MCP prompts\n\n\n \n Type `/` to see all available commands, including those from MCP servers. MCP prompts appear with the format `/mcp__servername__promptname`.\n \n\n \n ```\n > /mcp__github__list_prs\n ```\n \n\n \n Many prompts accept arguments. Pass them space-separated after the command:\n\n ```\n > /mcp__github__pr_review 456\n ```\n\n ```\n > /mcp__jira__create_issue \"Bug in login flow\" high\n ```\n \n\n\n\n Tips:\n\n * MCP prompts are dynamically discovered from connected servers\n * Arguments are parsed based on the prompt's defined parameters\n * Prompt results are injected directly into the conversation\n * Server and prompt names are normalized (spaces become underscores)\n\n\n## Managed MCP configuration\n\nFor organizations that need centralized control over MCP servers, Claude Code supports two configuration options:\n\n1. **Exclusive control with `managed-mcp.json`**: Deploy a fixed set of MCP servers that users cannot modify or extend\n2. **Policy-based control with allowlists/denylists**: Allow users to add their own servers, but restrict which ones are permitted\n\nThese options allow IT administrators to:\n\n* **Control which MCP servers employees can access**: Deploy a standardized set of approved MCP servers across the organization\n* **Prevent unauthorized MCP servers**: Restrict users from adding unapproved MCP servers\n* **Disable MCP entirely**: Remove MCP functionality completely if needed\n\n### Option 1: Exclusive control with managed-mcp.json\n\nWhen you deploy a `managed-mcp.json` file, it takes **exclusive control** over all MCP servers. Users cannot add, modify, or use any MCP servers other than those defined in this file. This is the simplest approach for organizations that want complete control.\n\nSystem administrators deploy the configuration file to a system-wide directory:\n\n* macOS: `/Library/Application Support/ClaudeCode/managed-mcp.json`\n* Linux and WSL: `/etc/claude-code/managed-mcp.json`\n* Windows: `C:\\Program Files\\ClaudeCode\\managed-mcp.json`\n\n\n These are system-wide paths (not user home directories like `~/Library/...`) that require administrator privileges. They are designed to be deployed by IT administrators.\n\n\nThe `managed-mcp.json` file uses the same format as a standard `.mcp.json` file:\n\n```json theme={null}\n{\n \"mcpServers\": {\n \"github\": {\n \"type\": \"http\",\n \"url\": \"https://api.githubcopilot.com/mcp/\"\n },\n \"sentry\": {\n \"type\": \"http\",\n \"url\": \"https://mcp.sentry.dev/mcp\"\n },\n \"company-internal\": {\n \"type\": \"stdio\",\n \"command\": \"/usr/local/bin/company-mcp-server\",\n \"args\": [\"--config\", \"/etc/company/mcp-config.json\"],\n \"env\": {\n \"COMPANY_API_URL\": \"https://internal.company.com\"\n }\n }\n }\n}\n```\n\n### Option 2: Policy-based control with allowlists and denylists\n\nInstead of taking exclusive control, administrators can allow users to configure their own MCP servers while enforcing restrictions on which servers are permitted. This approach uses `allowedMcpServers` and `deniedMcpServers` in the [managed settings file](/en/settings#settings-files).\n\n\n **Choosing between options**: Use Option 1 (`managed-mcp.json`) when you want to deploy a fixed set of servers with no user customization. Use Option 2 (allowlists/denylists) when you want to allow users to add their own servers within policy constraints.\n\n\n#### Restriction options\n\nEach entry in the allowlist or denylist can restrict servers in three ways:\n\n1. **By server name** (`serverName`): Matches the configured name of the server\n2. **By command** (`serverCommand`): Matches the exact command and arguments used to start stdio servers\n3. **By URL pattern** (`serverUrl`): Matches remote server URLs with wildcard support\n\n**Important**: Each entry must have exactly one of `serverName`, `serverCommand`, or `serverUrl`.\n\n#### Example configuration\n\n```json theme={null}\n{\n \"allowedMcpServers\": [\n // Allow by server name\n { \"serverName\": \"github\" },\n { \"serverName\": \"sentry\" },\n\n // Allow by exact command (for stdio servers)\n { \"serverCommand\": [\"npx\", \"-y\", \"@modelcontextprotocol/server-filesystem\"] },\n { \"serverCommand\": [\"python\", \"/usr/local/bin/approved-server.py\"] },\n\n // Allow by URL pattern (for remote servers)\n { \"serverUrl\": \"https://mcp.company.com/*\" },\n { \"serverUrl\": \"https://*.internal.corp/*\" }\n ],\n \"deniedMcpServers\": [\n // Block by server name\n { \"serverName\": \"dangerous-server\" },\n\n // Block by exact command (for stdio servers)\n { \"serverCommand\": [\"npx\", \"-y\", \"unapproved-package\"] },\n\n // Block by URL pattern (for remote servers)\n { \"serverUrl\": \"https://*.untrusted.com/*\" }\n ]\n}\n```\n\n#### How command-based restrictions work\n\n**Exact matching**:\n\n* Command arrays must match **exactly** - both the command and all arguments in the correct order\n* Example: `[\"npx\", \"-y\", \"server\"]` will NOT match `[\"npx\", \"server\"]` or `[\"npx\", \"-y\", \"server\", \"--flag\"]`\n\n**Stdio server behavior**:\n\n* When the allowlist contains **any** `serverCommand` entries, stdio servers **must** match one of those commands\n* Stdio servers cannot pass by name alone when command restrictions are present\n* This ensures administrators can enforce which commands are allowed to run\n\n**Non-stdio server behavior**:\n\n* Remote servers (HTTP, SSE, WebSocket) use URL-based matching when `serverUrl` entries exist in the allowlist\n* If no URL entries exist, remote servers fall back to name-based matching\n* Command restrictions do not apply to remote servers\n\n#### How URL-based restrictions work\n\nURL patterns support wildcards using `*` to match any sequence of characters. This is useful for allowing entire domains or subdomains.\n\n**Wildcard examples**:\n\n* `https://mcp.company.com/*` - Allow all paths on a specific domain\n* `https://*.example.com/*` - Allow any subdomain of example.com\n* `http://localhost:*/*` - Allow any port on localhost\n\n**Remote server behavior**:\n\n* When the allowlist contains **any** `serverUrl` entries, remote servers **must** match one of those URL patterns\n* Remote servers cannot pass by name alone when URL restrictions are present\n* This ensures administrators can enforce which remote endpoints are allowed\n\n\n ```json theme={null}\n {\n \"allowedMcpServers\": [\n { \"serverUrl\": \"https://mcp.company.com/*\" },\n { \"serverUrl\": \"https://*.internal.corp/*\" }\n ]\n }\n ```\n\n **Result**:\n\n * HTTP server at `https://mcp.company.com/api`: ✅ Allowed (matches URL pattern)\n * HTTP server at `https://api.internal.corp/mcp`: ✅ Allowed (matches wildcard subdomain)\n * HTTP server at `https://external.com/mcp`: ❌ Blocked (doesn't match any URL pattern)\n * Stdio server with any command: ❌ Blocked (no name or command entries to match)\n\n\n\n ```json theme={null}\n {\n \"allowedMcpServers\": [\n { \"serverCommand\": [\"npx\", \"-y\", \"approved-package\"] }\n ]\n }\n ```\n\n **Result**:\n\n * Stdio server with `[\"npx\", \"-y\", \"approved-package\"]`: ✅ Allowed (matches command)\n * Stdio server with `[\"node\", \"server.js\"]`: ❌ Blocked (doesn't match command)\n * HTTP server named \"my-api\": ❌ Blocked (no name entries to match)\n\n\n\n ```json theme={null}\n {\n \"allowedMcpServers\": [\n { \"serverName\": \"github\" },\n { \"serverCommand\": [\"npx\", \"-y\", \"approved-package\"] }\n ]\n }\n ```\n\n **Result**:\n\n * Stdio server named \"local-tool\" with `[\"npx\", \"-y\", \"approved-package\"]`: ✅ Allowed (matches command)\n * Stdio server named \"local-tool\" with `[\"node\", \"server.js\"]`: ❌ Blocked (command entries exist but doesn't match)\n * Stdio server named \"github\" with `[\"node\", \"server.js\"]`: ❌ Blocked (stdio servers must match commands when command entries exist)\n * HTTP server named \"github\": ✅ Allowed (matches name)\n * HTTP server named \"other-api\": ❌ Blocked (name doesn't match)\n\n\n\n ```json theme={null}\n {\n \"allowedMcpServers\": [\n { \"serverName\": \"github\" },\n { \"serverName\": \"internal-tool\" }\n ]\n }\n ```\n\n **Result**:\n\n * Stdio server named \"github\" with any command: ✅ Allowed (no command restrictions)\n * Stdio server named \"internal-tool\" with any command: ✅ Allowed (no command restrictions)\n * HTTP server named \"github\": ✅ Allowed (matches name)\n * Any server named \"other\": ❌ Blocked (name doesn't match)\n\n\n#### Allowlist behavior (`allowedMcpServers`)\n\n* `undefined` (default): No restrictions - users can configure any MCP server\n* Empty array `[]`: Complete lockdown - users cannot configure any MCP servers\n* List of entries: Users can only configure servers that match by name, command, or URL pattern\n\n#### Denylist behavior (`deniedMcpServers`)\n\n* `undefined` (default): No servers are blocked\n* Empty array `[]`: No servers are blocked\n* List of entries: Specified servers are explicitly blocked across all scopes\n\n#### Important notes\n\n* **Option 1 and Option 2 can be combined**: If `managed-mcp.json` exists, it has exclusive control and users cannot add servers. Allowlists/denylists still apply to the managed servers themselves.\n* **Denylist takes absolute precedence**: If a server matches a denylist entry (by name, command, or URL), it will be blocked even if it's on the allowlist\n* Name-based, command-based, and URL-based restrictions work together: a server passes if it matches **either** a name entry, a command entry, or a URL pattern (unless blocked by denylist)\n\n\n **When using `managed-mcp.json`**: Users cannot add MCP servers through `claude mcp add` or configuration files. The `allowedMcpServers` and `deniedMcpServers` settings still apply to filter which managed servers are actually loaded.\n\n"}]},"uuid":"d9b498c2-8ac0-4fa2-b046-7b0bf3ce8847","timestamp":"2026-02-23T18:22:09.018Z","sourceToolAssistantUUID":"23b785d4-331d-45a3-9058-cb937825696a"} {"parentUuid":"d9b498c2-8ac0-4fa2-b046-7b0bf3ce8847","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/auto_respawn.py"},"parentToolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","toolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","timestamp":"2026-02-23T18:22:14.551Z","uuid":"74a61070-fad5-4d84-b444-6dd58ab20853"} {"parentUuid":"74a61070-fad5-4d84-b444-6dd58ab20853","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/observability_logger.py"},"parentToolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","toolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","timestamp":"2026-02-23T18:22:14.551Z","uuid":"0e07ded5-af58-433d-a610-ed6533047b44"} {"parentUuid":"0e07ded5-af58-433d-a610-ed6533047b44","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/session_heartbeat.py"},"parentToolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","toolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","timestamp":"2026-02-23T18:22:14.551Z","uuid":"f5a8abb3-c493-4d55-856d-36055d68a3ac"} {"parentUuid":"f5a8abb3-c493-4d55-856d-36055d68a3ac","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/thinking_block_monitor.py"},"parentToolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","toolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","timestamp":"2026-02-23T18:22:14.551Z","uuid":"31ad1aac-4bfa-45c5-9257-f5bc8042a0a5"} {"parentUuid":"31ad1aac-4bfa-45c5-9257-f5bc8042a0a5","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/weekly_usage_tracker.py"},"parentToolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","toolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","timestamp":"2026-02-23T18:22:14.551Z","uuid":"0da19e20-c4c0-48e5-9111-1ef8fa5a9974"} {"parentUuid":"0da19e20-c4c0-48e5-9111-1ef8fa5a9974","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"python3 ${CLAUDE_PLUGIN_ROOT}/hooks/posttooluse.py"},"parentToolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","toolUseID":"toolu_011tCzmUxzMAJwYofhMxuxnn","timestamp":"2026-02-23T18:22:14.551Z","uuid":"7950e224-cc73-4421-950d-b3cf32d8af1e"} {"parentUuid":"717124a5-69b7-4e11-a7c0-a6be6a53dd6b","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_011tCzmUxzMAJwYofhMxuxnn","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# Create custom subagents\n\n> Create and use specialized AI subagents in Claude Code for task-specific workflows and improved context management.\n\nSubagents are specialized AI assistants that handle specific types of tasks. Each subagent runs in its own context window with a custom system prompt, specific tool access, and independent permissions. When Claude encounters a task that matches a subagent's description, it delegates to that subagent, which works independently and returns results.\n\n\n If you need multiple agents working in parallel and communicating with each other, see [agent teams](/en/agent-teams) instead. Subagents work within a single session; agent teams coordinate across separate sessions.\n\n\nSubagents help you:\n\n* **Preserve context** by keeping exploration and implementation out of your main conversation\n* **Enforce constraints** by limiting which tools a subagent can use\n* **Reuse configurations** across projects with user-level subagents\n* **Specialize behavior** with focused system prompts for specific domains\n* **Control costs** by routing tasks to faster, cheaper models like Haiku\n\nClaude uses each subagent's description to decide when to delegate tasks. When you create a subagent, write a clear description so Claude knows when to use it.\n\nClaude Code includes several built-in subagents like **Explore**, **Plan**, and **general-purpose**. You can also create custom subagents to handle specific tasks. This page covers the [built-in subagents](#built-in-subagents), [how to create your own](#quickstart-create-your-first-subagent), [full configuration options](#configure-subagents), [patterns for working with subagents](#work-with-subagents), and [example subagents](#example-subagents).\n\n## Built-in subagents\n\nClaude Code includes built-in subagents that Claude automatically uses when appropriate. Each inherits the parent conversation's permissions with additional tool restrictions.\n\n\n \n A fast, read-only agent optimized for searching and analyzing codebases.\n\n * **Model**: Haiku (fast, low-latency)\n * **Tools**: Read-only tools (denied access to Write and Edit tools)\n * **Purpose**: File discovery, code search, codebase exploration\n\n Claude delegates to Explore when it needs to search or understand a codebase without making changes. This keeps exploration results out of your main conversation context.\n\n When invoking Explore, Claude specifies a thoroughness level: **quick** for targeted lookups, **medium** for balanced exploration, or **very thorough** for comprehensive analysis.\n \n\n \n A research agent used during [plan mode](/en/common-workflows#use-plan-mode-for-safe-code-analysis) to gather context before presenting a plan.\n\n * **Model**: Inherits from main conversation\n * **Tools**: Read-only tools (denied access to Write and Edit tools)\n * **Purpose**: Codebase research for planning\n\n When you're in plan mode and Claude needs to understand your codebase, it delegates research to the Plan subagent. This prevents infinite nesting (subagents cannot spawn other subagents) while still gathering necessary context.\n \n\n \n A capable agent for complex, multi-step tasks that require both exploration and action.\n\n * **Model**: Inherits from main conversation\n * **Tools**: All tools\n * **Purpose**: Complex research, multi-step operations, code modifications\n\n Claude delegates to general-purpose when the task requires both exploration and modification, complex reasoning to interpret results, or multiple dependent steps.\n \n\n \n Claude Code includes additional helper agents for specific tasks. These are typically invoked automatically, so you don't need to use them directly.\n\n | Agent | Model | When Claude uses it |\n | :---------------- | :------- | :------------------------------------------------------- |\n | Bash | Inherits | Running terminal commands in a separate context |\n | statusline-setup | Sonnet | When you run `/statusline` to configure your status line |\n | Claude Code Guide | Haiku | When you ask questions about Claude Code features |\n \n\n\nBeyond these built-in subagents, you can create your own with custom prompts, tool restrictions, permission modes, hooks, and skills. The following sections show how to get started and customize subagents.\n\n## Quickstart: create your first subagent\n\nSubagents are defined in Markdown files with YAML frontmatter. You can [create them manually](#write-subagent-files) or use the `/agents` command.\n\nThis walkthrough guides you through creating a user-level subagent with the `/agent` command. The subagent reviews code and suggests improvements for the codebase.\n\n\n \n In Claude Code, run:\n\n ```\n /agents\n ```\n \n\n \n Select **Create new agent**, then choose **User-level**. This saves the subagent to `~/.claude/agents/` so it's available in all your projects.\n \n\n \n Select **Generate with Claude**. When prompted, describe the subagent:\n\n ```\n A code improvement agent that scans files and suggests improvements\n for readability, performance, and best practices. It should explain\n each issue, show the current code, and provide an improved version.\n ```\n\n Claude generates the system prompt and configuration. Press `e` to open it in your editor if you want to customize it.\n \n\n \n For a read-only reviewer, deselect everything except **Read-only tools**. If you keep all tools selected, the subagent inherits all tools available to the main conversation.\n \n\n \n Choose which model the subagent uses. For this example agent, select **Sonnet**, which balances capability and speed for analyzing code patterns.\n \n\n \n Pick a background color for the subagent. This helps you identify which subagent is running in the UI.\n \n\n \n Save the subagent. It's available immediately (no restart needed). Try it:\n\n ```\n Use the code-improver agent to suggest improvements in this project\n ```\n\n Claude delegates to your new subagent, which scans the codebase and returns improvement suggestions.\n \n\n\nYou now have a subagent you can use in any project on your machine to analyze codebases and suggest improvements.\n\nYou can also create subagents manually as Markdown files, define them via CLI flags, or distribute them through plugins. The following sections cover all configuration options.\n\n## Configure subagents\n\n### Use the /agents command\n\nThe `/agents` command provides an interactive interface for managing subagents. Run `/agents` to:\n\n* View all available subagents (built-in, user, project, and plugin)\n* Create new subagents with guided setup or Claude generation\n* Edit existing subagent configuration and tool access\n* Delete custom subagents\n* See which subagents are active when duplicates exist\n\nThis is the recommended way to create and manage subagents. For manual creation or automation, you can also add subagent files directly.\n\nTo list all configured subagents from the command line without starting an interactive session, run `claude agents`. This shows agents grouped by source and indicates which are overridden by higher-priority definitions.\n\n### Choose the subagent scope\n\nSubagents are Markdown files with YAML frontmatter. Store them in different locations depending on scope. When multiple subagents share the same name, the higher-priority location wins.\n\n| Location | Scope | Priority | How to create |\n| :--------------------------- | :---------------------- | :---------- | :------------------------------------ |\n| `--agents` CLI flag | Current session | 1 (highest) | Pass JSON when launching Claude Code |\n| `.claude/agents/` | Current project | 2 | Interactive or manual |\n| `~/.claude/agents/` | All your projects | 3 | Interactive or manual |\n| Plugin's `agents/` directory | Where plugin is enabled | 4 (lowest) | Installed with [plugins](/en/plugins) |\n\n**Project subagents** (`.claude/agents/`) are ideal for subagents specific to a codebase. Check them into version control so your team can use and improve them collaboratively.\n\n**User subagents** (`~/.claude/agents/`) are personal subagents available in all your projects.\n\n**CLI-defined subagents** are passed as JSON when launching Claude Code. They exist only for that session and aren't saved to disk, making them useful for quick testing or automation scripts:\n\n```bash theme={null}\nclaude --agents '{\n \"code-reviewer\": {\n \"description\": \"Expert code reviewer. Use proactively after code changes.\",\n \"prompt\": \"You are a senior code reviewer. Focus on code quality, security, and best practices.\",\n \"tools\": [\"Read\", \"Grep\", \"Glob\", \"Bash\"],\n \"model\": \"sonnet\"\n }\n}'\n```\n\nThe `--agents` flag accepts JSON with the same [frontmatter](#supported-frontmatter-fields) fields as file-based subagents: `description`, `prompt`, `tools`, `disallowedTools`, `model`, `permissionMode`, `mcpServers`, `hooks`, `maxTurns`, `skills`, and `memory`. Use `prompt` for the system prompt, equivalent to the markdown body in file-based subagents. See the [CLI reference](/en/cli-reference#agents-flag-format) for the full JSON format.\n\n**Plugin subagents** come from [plugins](/en/plugins) you've installed. They appear in `/agents` alongside your custom subagents. See the [plugin components reference](/en/plugins-reference#agents) for details on creating plugin subagents.\n\n### Write subagent files\n\nSubagent files use YAML frontmatter for configuration, followed by the system prompt in Markdown:\n\n\n Subagents are loaded at session start. If you create a subagent by manually adding a file, restart your session or use `/agents` to load it immediately.\n\n\n```markdown theme={null}\n---\nname: code-reviewer\ndescription: Reviews code for quality and best practices\ntools: Read, Glob, Grep\nmodel: sonnet\n---\n\nYou are a code reviewer. When invoked, analyze the code and provide\nspecific, actionable feedback on quality, security, and best practices.\n```\n\nThe frontmatter defines the subagent's metadata and configuration. The body becomes the system prompt that guides the subagent's behavior. Subagents receive only this system prompt (plus basic environment details like working directory), not the full Claude Code system prompt.\n\n#### Supported frontmatter fields\n\nThe following fields can be used in the YAML frontmatter. Only `name` and `description` are required.\n\n| Field | Required | Description |\n| :---------------- | :------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| `name` | Yes | Unique identifier using lowercase letters and hyphens |\n| `description` | Yes | When Claude should delegate to this subagent |\n| `tools` | No | [Tools](#available-tools) the subagent can use. Inherits all tools if omitted |\n| `disallowedTools` | No | Tools to deny, removed from inherited or specified list |\n| `model` | No | [Model](#choose-a-model) to use: `sonnet`, `opus`, `haiku`, or `inherit`. Defaults to `inherit` |\n| `permissionMode` | No | [Permission mode](#permission-modes): `default`, `acceptEdits`, `dontAsk`, `bypassPermissions`, or `plan` |\n| `maxTurns` | No | Maximum number of agentic turns before the subagent stops |\n| `skills` | No | [Skills](/en/skills) to load into the subagent's context at startup. The full skill content is injected, not just made available for invocation. Subagents don't inherit skills from the parent conversation |\n| `mcpServers` | No | [MCP servers](/en/mcp) available to this subagent. Each entry is either a server name referencing an already-configured server (e.g., `\"slack\"`) or an inline definition with the server name as key and a full [MCP server config](/en/mcp#configure-mcp-servers) as value |\n| `hooks` | No | [Lifecycle hooks](#define-hooks-for-subagents) scoped to this subagent |\n| `memory` | No | [Persistent memory scope](#enable-persistent-memory): `user`, `project`, or `local`. Enables cross-session learning |\n| `background` | No | Set to `true` to always run this subagent as a [background task](#run-subagents-in-foreground-or-background). Default: `false` |\n| `isolation` | No | Set to `worktree` to run the subagent in a temporary [git worktree](/en/common-workflows#run-parallel-claude-code-sessions-with-git-worktrees), giving it an isolated copy of the repository. The worktree is automatically cleaned up if the subagent makes no changes |\n\n### Choose a model\n\nThe `model` field controls which [AI model](/en/model-config) the subagent uses:\n\n* **Model alias**: Use one of the available aliases: `sonnet`, `opus`, or `haiku`\n* **inherit**: Use the same model as the main conversation\n* **Omitted**: If not specified, defaults to `inherit` (uses the same model as the main conversation)\n\n### Control subagent capabilities\n\nYou can control what subagents can do through tool access, permission modes, and conditional rules.\n\n#### Available tools\n\nSubagents can use any of Claude Code's [internal tools](/en/settings#tools-available-to-claude). By default, subagents inherit all tools from the main conversation, including MCP tools.\n\nTo restrict tools, use the `tools` field (allowlist) or `disallowedTools` field (denylist):\n\n```yaml theme={null}\n---\nname: safe-researcher\ndescription: Research agent with restricted capabilities\ntools: Read, Grep, Glob, Bash\ndisallowedTools: Write, Edit\n---\n```\n\n#### Restrict which subagents can be spawned\n\nWhen an agent runs as the main thread with `claude --agent`, it can spawn subagents using the Task tool. To restrict which subagent types it can spawn, use `Task(agent_type)` syntax in the `tools` field:\n\n```yaml theme={null}\n---\nname: coordinator\ndescription: Coordinates work across specialized agents\ntools: Task(worker, researcher), Read, Bash\n---\n```\n\nThis is an allowlist: only the `worker` and `researcher` subagents can be spawned. If the agent tries to spawn any other type, the request fails and the agent sees only the allowed types in its prompt. To block specific agents while allowing all others, use [`permissions.deny`](#disable-specific-subagents) instead.\n\nTo allow spawning any subagent without restrictions, use `Task` without parentheses:\n\n```yaml theme={null}\ntools: Task, Read, Bash\n```\n\nIf `Task` is omitted from the `tools` list entirely, the agent cannot spawn any subagents. This restriction only applies to agents running as the main thread with `claude --agent`. Subagents cannot spawn other subagents, so `Task(agent_type)` has no effect in subagent definitions.\n\n#### Permission modes\n\nThe `permissionMode` field controls how the subagent handles permission prompts. Subagents inherit the permission context from the main conversation but can override the mode.\n\n| Mode | Behavior |\n| :------------------ | :----------------------------------------------------------------- |\n| `default` | Standard permission checking with prompts |\n| `acceptEdits` | Auto-accept file edits |\n| `dontAsk` | Auto-deny permission prompts (explicitly allowed tools still work) |\n| `bypassPermissions` | Skip all permission checks |\n| `plan` | Plan mode (read-only exploration) |\n\n\n Use `bypassPermissions` with caution. It skips all permission checks, allowing the subagent to execute any operation without approval.\n\n\nIf the parent uses `bypassPermissions`, this takes precedence and cannot be overridden.\n\n#### Preload skills into subagents\n\nUse the `skills` field to inject skill content into a subagent's context at startup. This gives the subagent domain knowledge without requiring it to discover and load skills during execution.\n\n```yaml theme={null}\n---\nname: api-developer\ndescription: Implement API endpoints following team conventions\nskills:\n - api-conventions\n - error-handling-patterns\n---\n\nImplement API endpoints. Follow the conventions and patterns from the preloaded skills.\n```\n\nThe full content of each skill is injected into the subagent's context, not just made available for invocation. Subagents don't inherit skills from the parent conversation; you must list them explicitly.\n\n\n This is the inverse of [running a skill in a subagent](/en/skills#run-skills-in-a-subagent). With `skills` in a subagent, the subagent controls the system prompt and loads skill content. With `context: fork` in a skill, the skill content is injected into the agent you specify. Both use the same underlying system.\n\n\n#### Enable persistent memory\n\nThe `memory` field gives the subagent a persistent directory that survives across conversations. The subagent uses this directory to build up knowledge over time, such as codebase patterns, debugging insights, and architectural decisions.\n\n```yaml theme={null}\n---\nname: code-reviewer\ndescription: Reviews code for quality and best practices\nmemory: user\n---\n\nYou are a code reviewer. As you review code, update your agent memory with\npatterns, conventions, and recurring issues you discover.\n```\n\nChoose a scope based on how broadly the memory should apply:\n\n| Scope | Location | Use when |\n| :-------- | :-------------------------------------------- | :------------------------------------------------------------------------------------------ |\n| `user` | `~/.claude/agent-memory//` | the subagent should remember learnings across all projects |\n| `project` | `.claude/agent-memory//` | the subagent's knowledge is project-specific and shareable via version control |\n| `local` | `.claude/agent-memory-local//` | the subagent's knowledge is project-specific but should not be checked into version control |\n\nWhen memory is enabled:\n\n* The subagent's system prompt includes instructions for reading and writing to the memory directory.\n* The subagent's system prompt also includes the first 200 lines of `MEMORY.md` in the memory directory, with instructions to curate `MEMORY.md` if it exceeds 200 lines.\n* Read, Write, and Edit tools are automatically enabled so the subagent can manage its memory files.\n\n##### Persistent memory tips\n\n* `user` is the recommended default scope. Use `project` or `local` when the subagent's knowledge is only relevant to a specific codebase.\n* Ask the subagent to consult its memory before starting work: \"Review this PR, and check your memory for patterns you've seen before.\"\n* Ask the subagent to update its memory after completing a task: \"Now that you're done, save what you learned to your memory.\" Over time, this builds a knowledge base that makes the subagent more effective.\n* Include memory instructions directly in the subagent's markdown file so it proactively maintains its own knowledge base:\n\n ```markdown theme={null}\n Update your agent memory as you discover codepaths, patterns, library\n locations, and key architectural decisions. This builds up institutional\n knowledge across conversations. Write concise notes about what you found\n and where.\n ```\n\n#### Conditional rules with hooks\n\nFor more dynamic control over tool usage, use `PreToolUse` hooks to validate operations before they execute. This is useful when you need to allow some operations of a tool while blocking others.\n\nThis example creates a subagent that only allows read-only database queries. The `PreToolUse` hook runs the script specified in `command` before each Bash command executes:\n\n```yaml theme={null}\n---\nname: db-reader\ndescription: Execute read-only database queries\ntools: Bash\nhooks:\n PreToolUse:\n - matcher: \"Bash\"\n hooks:\n - type: command\n command: \"./scripts/validate-readonly-query.sh\"\n---\n```\n\nClaude Code [passes hook input as JSON](/en/hooks#pretooluse-input) via stdin to hook commands. The validation script reads this JSON, extracts the Bash command, and [exits with code 2](/en/hooks#exit-code-2-behavior-per-event) to block write operations:\n\n```bash theme={null}\n#!/bin/bash\n# ./scripts/validate-readonly-query.sh\n\nINPUT=$(cat)\nCOMMAND=$(echo \"$INPUT\" | jq -r '.tool_input.command // empty')\n\n# Block SQL write operations (case-insensitive)\nif echo \"$COMMAND\" | grep -iE '\\b(INSERT|UPDATE|DELETE|DROP|CREATE|ALTER|TRUNCATE)\\b' > /dev/null; then\n echo \"Blocked: Only SELECT queries are allowed\" >&2\n exit 2\nfi\n\nexit 0\n```\n\nSee [Hook input](/en/hooks#pretooluse-input) for the complete input schema and [exit codes](/en/hooks#exit-code-output) for how exit codes affect behavior.\n\n#### Disable specific subagents\n\nYou can prevent Claude from using specific subagents by adding them to the `deny` array in your [settings](/en/settings#permission-settings). Use the format `Task(subagent-name)` where `subagent-name` matches the subagent's name field.\n\n```json theme={null}\n{\n \"permissions\": {\n \"deny\": [\"Task(Explore)\", \"Task(my-custom-agent)\"]\n }\n}\n```\n\nThis works for both built-in and custom subagents. You can also use the `--disallowedTools` CLI flag:\n\n```bash theme={null}\nclaude --disallowedTools \"Task(Explore)\"\n```\n\nSee [Permissions documentation](/en/permissions#tool-specific-permission-rules) for more details on permission rules.\n\n### Define hooks for subagents\n\nSubagents can define [hooks](/en/hooks) that run during the subagent's lifecycle. There are two ways to configure hooks:\n\n1. **In the subagent's frontmatter**: Define hooks that run only while that subagent is active\n2. **In `settings.json`**: Define hooks that run in the main session when subagents start or stop\n\n#### Hooks in subagent frontmatter\n\nDefine hooks directly in the subagent's markdown file. These hooks only run while that specific subagent is active and are cleaned up when it finishes.\n\nAll [hook events](/en/hooks#hook-events) are supported. The most common events for subagents are:\n\n| Event | Matcher input | When it fires |\n| :------------ | :------------ | :------------------------------------------------------------------ |\n| `PreToolUse` | Tool name | Before the subagent uses a tool |\n| `PostToolUse` | Tool name | After the subagent uses a tool |\n| `Stop` | (none) | When the subagent finishes (converted to `SubagentStop` at runtime) |\n\nThis example validates Bash commands with the `PreToolUse` hook and runs a linter after file edits with `PostToolUse`:\n\n```yaml theme={null}\n---\nname: code-reviewer\ndescription: Review code changes with automatic linting\nhooks:\n PreToolUse:\n - matcher: \"Bash\"\n hooks:\n - type: command\n command: \"./scripts/validate-command.sh $TOOL_INPUT\"\n PostToolUse:\n - matcher: \"Edit|Write\"\n hooks:\n - type: command\n command: \"./scripts/run-linter.sh\"\n---\n```\n\n`Stop` hooks in frontmatter are automatically converted to `SubagentStop` events.\n\n#### Project-level hooks for subagent events\n\nConfigure hooks in `settings.json` that respond to subagent lifecycle events in the main session.\n\n| Event | Matcher input | When it fires |\n| :-------------- | :-------------- | :------------------------------- |\n| `SubagentStart` | Agent type name | When a subagent begins execution |\n| `SubagentStop` | Agent type name | When a subagent completes |\n\nBoth events support matchers to target specific agent types by name. This example runs a setup script only when the `db-agent` subagent starts, and a cleanup script when any subagent stops:\n\n```json theme={null}\n{\n \"hooks\": {\n \"SubagentStart\": [\n {\n \"matcher\": \"db-agent\",\n \"hooks\": [\n { \"type\": \"command\", \"command\": \"./scripts/setup-db-connection.sh\" }\n ]\n }\n ],\n \"SubagentStop\": [\n {\n \"hooks\": [\n { \"type\": \"command\", \"command\": \"./scripts/cleanup-db-connection.sh\" }\n ]\n }\n ]\n }\n}\n```\n\nSee [Hooks](/en/hooks) for the complete hook configuration format.\n\n## Work with subagents\n\n### Understand automatic delegation\n\nClaude automatically delegates tasks based on the task description in your request, the `description` field in subagent configurations, and current context. To encourage proactive delegation, include phrases like \"use proactively\" in your subagent's description field.\n\nYou can also request a specific subagent explicitly:\n\n```\nUse the test-runner subagent to fix failing tests\nHave the code-reviewer subagent look at my recent changes\n```\n\n### Run subagents in foreground or background\n\nSubagents can run in the foreground (blocking) or background (concurrent):\n\n* **Foreground subagents** block the main conversation until complete. Permission prompts and clarifying questions (like [`AskUserQuestion`](/en/settings#tools-available-to-claude)) are passed through to you.\n* **Background subagents** run concurrently while you continue working. Before launching, Claude Code prompts for any tool permissions the subagent will need, ensuring it has the necessary approvals upfront. Once running, the subagent inherits these permissions and auto-denies anything not pre-approved. If a background subagent needs to ask clarifying questions, that tool call fails but the subagent continues. MCP tools are not available in background subagents.\n\nIf a background subagent fails due to missing permissions, you can [resume it](#resume-subagents) in the foreground to retry with interactive prompts.\n\nClaude decides whether to run subagents in the foreground or background based on the task. You can also:\n\n* Ask Claude to \"run this in the background\"\n* Press **Ctrl+B** to background a running task\n\nTo disable all background task functionality, set the `CLAUDE_CODE_DISABLE_BACKGROUND_TASKS` environment variable to `1`. See [Environment variables](/en/settings#environment-variables).\n\n### Common patterns\n\n#### Isolate high-volume operations\n\nOne of the most effective uses for subagents is isolating operations that produce large amounts of output. Running tests, fetching documentation, or processing log files can consume significant context. By delegating these to a subagent, the verbose output stays in the subagent's context while only the relevant summary returns to your main conversation.\n\n```\nUse a subagent to run the test suite and report only the failing tests with their error messages\n```\n\n#### Run parallel research\n\nFor independent investigations, spawn multiple subagents to work simultaneously:\n\n```\nResearch the authentication, database, and API modules in parallel using separate subagents\n```\n\nEach subagent explores its area independently, then Claude synthesizes the findings. This works best when the research paths don't depend on each other.\n\n\n When subagents complete, their results return to your main conversation. Running many subagents that each return detailed results can consume significant context.\n\n\nFor tasks that need sustained parallelism or exceed your context window, [agent teams](/en/agent-teams) give each worker its own independent context.\n\n#### Chain subagents\n\nFor multi-step workflows, ask Claude to use subagents in sequence. Each subagent completes its task and returns results to Claude, which then passes relevant context to the next subagent.\n\n```\nUse the code-reviewer subagent to find performance issues, then use the optimizer subagent to fix them\n```\n\n### Choose between subagents and main conversation\n\nUse the **main conversation** when:\n\n* The task needs frequent back-and-forth or iterative refinement\n* Multiple phases share significant context (planning → implementation → testing)\n* You're making a quick, targeted change\n* Latency matters. Subagents start fresh and may need time to gather context\n\nUse **subagents** when:\n\n* The task produces verbose output you don't need in your main context\n* You want to enforce specific tool restrictions or permissions\n* The work is self-contained and can return a summary\n\nConsider [Skills](/en/skills) instead when you want reusable prompts or workflows that run in the main conversation context rather than isolated subagent context.\n\n\n Subagents cannot spawn other subagents. If your workflow requires nested delegation, use [Skills](/en/skills) or [chain subagents](#chain-subagents) from the main conversation.\n\n\n### Manage subagent context\n\n#### Resume subagents\n\nEach subagent invocation creates a new instance with fresh context. To continue an existing subagent's work instead of starting over, ask Claude to resume it.\n\nResumed subagents retain their full conversation history, including all previous tool calls, results, and reasoning. The subagent picks up exactly where it stopped rather than starting fresh.\n\nWhen a subagent completes, Claude receives its agent ID. To resume a subagent, ask Claude to continue the previous work:\n\n```\nUse the code-reviewer subagent to review the authentication module\n[Agent completes]\n\nContinue that code review and now analyze the authorization logic\n[Claude resumes the subagent with full context from previous conversation]\n```\n\nYou can also ask Claude for the agent ID if you want to reference it explicitly, or find IDs in the transcript files at `~/.claude/projects/{project}/{sessionId}/subagents/`. Each transcript is stored as `agent-{agentId}.jsonl`.\n\nSubagent transcripts persist independently of the main conversation:\n\n* **Main conversation compaction**: When the main conversation compacts, subagent transcripts are unaffected. They're stored in separate files.\n* **Session persistence**: Subagent transcripts persist within their session. You can [resume a subagent](#resume-subagents) after restarting Claude Code by resuming the same session.\n* **Automatic cleanup**: Transcripts are cleaned up based on the `cleanupPeriodDays` setting (default: 30 days).\n\n#### Auto-compaction\n\nSubagents support automatic compaction using the same logic as the main conversation. By default, auto-compaction triggers at approximately 95% capacity. To trigger compaction earlier, set `CLAUDE_AUTOCOMPACT_PCT_OVERRIDE` to a lower percentage (for example, `50`). See [environment variables](/en/settings#environment-variables) for details.\n\nCompaction events are logged in subagent transcript files:\n\n```json theme={null}\n{\n \"type\": \"system\",\n \"subtype\": \"compact_boundary\",\n \"compactMetadata\": {\n \"trigger\": \"auto\",\n \"preTokens\": 167189\n }\n}\n```\n\nThe `preTokens` value shows how many tokens were used before compaction occurred.\n\n## Example subagents\n\nThese examples demonstrate effective patterns for building subagents. Use them as starting points, or generate a customized version with Claude.\n\n\n **Best practices:**\n\n * **Design focused subagents:** each subagent should excel at one specific task\n * **Write detailed descriptions:** Claude uses the description to decide when to delegate\n * **Limit tool access:** grant only necessary permissions for security and focus\n * **Check into version control:** share project subagents with your team\n\n\n### Code reviewer\n\nA read-only subagent that reviews code without modifying it. This example shows how to design a focused subagent with limited tool access (no Edit or Write) and a detailed prompt that specifies exactly what to look for and how to format output.\n\n```markdown theme={null}\n---\nname: code-reviewer\ndescription: Expert code review specialist. Proactively reviews code for quality, security, and maintainability. Use immediately after writing or modifying code.\ntools: Read, Grep, Glob, Bash\nmodel: inherit\n---\n\nYou are a senior code reviewer ensuring high standards of code quality and security.\n\nWhen invoked:\n1. Run git diff to see recent changes\n2. Focus on modified files\n3. Begin review immediately\n\nReview checklist:\n- Code is clear and readable\n- Functions and variables are well-named\n- No duplicated code\n- Proper error handling\n- No exposed secrets or API keys\n- Input validation implemented\n- Good test coverage\n- Performance considerations addressed\n\nProvide feedback organized by priority:\n- Critical issues (must fix)\n- Warnings (should fix)\n- Suggestions (consider improving)\n\nInclude specific examples of how to fix issues.\n```\n\n### Debugger\n\nA subagent that can both analyze and fix issues. Unlike the code reviewer, this one includes Edit because fixing bugs requires modifying code. The prompt provides a clear workflow from diagnosis to verification.\n\n```markdown theme={null}\n---\nname: debugger\ndescription: Debugging specialist for errors, test failures, and unexpected behavior. Use proactively when encountering any issues.\ntools: Read, Edit, Bash, Grep, Glob\n---\n\nYou are an expert debugger specializing in root cause analysis.\n\nWhen invoked:\n1. Capture error message and stack trace\n2. Identify reproduction steps\n3. Isolate the failure location\n4. Implement minimal fix\n5. Verify solution works\n\nDebugging process:\n- Analyze error messages and logs\n- Check recent code changes\n- Form and test hypotheses\n- Add strategic debug logging\n- Inspect variable states\n\nFor each issue, provide:\n- Root cause explanation\n- Evidence supporting the diagnosis\n- Specific code fix\n- Testing approach\n- Prevention recommendations\n\nFocus on fixing the underlying issue, not the symptoms.\n```\n\n### Data scientist\n\nA domain-specific subagent for data analysis work. This example shows how to create subagents for specialized workflows outside of typical coding tasks. It explicitly sets `model: sonnet` for more capable analysis.\n\n```markdown theme={null}\n---\nname: data-scientist\ndescription: Data analysis expert for SQL queries, BigQuery operations, and data insights. Use proactively for data analysis tasks and queries.\ntools: Bash, Read, Write\nmodel: sonnet\n---\n\nYou are a data scientist specializing in SQL and BigQuery analysis.\n\nWhen invoked:\n1. Understand the data analysis requirement\n2. Write efficient SQL queries\n3. Use BigQuery command line tools (bq) when appropriate\n4. Analyze and summarize results\n5. Present findings clearly\n\nKey practices:\n- Write optimized SQL queries with proper filters\n- Use appropriate aggregations and joins\n- Include comments explaining complex logic\n- Format results for readability\n- Provide data-driven recommendations\n\nFor each analysis:\n- Explain the query approach\n- Document any assumptions\n- Highlight key findings\n- Suggest next steps based on data\n\nAlways ensure queries are efficient and cost-effective.\n```\n\n### Database query validator\n\nA subagent that allows Bash access but validates commands to permit only read-only SQL queries. This example shows how to use `PreToolUse` hooks for conditional validation when you need finer control than the `tools` field provides.\n\n```markdown theme={null}\n---\nname: db-reader\ndescription: Execute read-only database queries. Use when analyzing data or generating reports.\ntools: Bash\nhooks:\n PreToolUse:\n - matcher: \"Bash\"\n hooks:\n - type: command\n command: \"./scripts/validate-readonly-query.sh\"\n---\n\nYou are a database analyst with read-only access. Execute SELECT queries to answer questions about the data.\n\nWhen asked to analyze data:\n1. Identify which tables contain the relevant data\n2. Write efficient SELECT queries with appropriate filters\n3. Present results clearly with context\n\nYou cannot modify data. If asked to INSERT, UPDATE, DELETE, or modify schema, explain that you only have read access.\n```\n\nClaude Code [passes hook input as JSON](/en/hooks#pretooluse-input) via stdin to hook commands. The validation script reads this JSON, extracts the command being executed, and checks it against a list of SQL write operations. If a write operation is detected, the script [exits with code 2](/en/hooks#exit-code-2-behavior-per-event) to block execution and returns an error message to Claude via stderr.\n\nCreate the validation script anywhere in your project. The path must match the `command` field in your hook configuration:\n\n```bash theme={null}\n#!/bin/bash\n# Blocks SQL write operations, allows SELECT queries\n\n# Read JSON input from stdin\nINPUT=$(cat)\n\n# Extract the command field from tool_input using jq\nCOMMAND=$(echo \"$INPUT\" | jq -r '.tool_input.command // empty')\n\nif [ -z \"$COMMAND\" ]; then\n exit 0\nfi\n\n# Block write operations (case-insensitive)\nif echo \"$COMMAND\" | grep -iE '\\b(INSERT|UPDATE|DELETE|DROP|CREATE|ALTER|TRUNCATE|REPLACE|MERGE)\\b' > /dev/null; then\n echo \"Blocked: Write operations not allowed. Use SELECT queries only.\" >&2\n exit 2\nfi\n\nexit 0\n```\n\nMake the script executable:\n\n```bash theme={null}\nchmod +x ./scripts/validate-readonly-query.sh\n```\n\nThe hook receives JSON via stdin with the Bash command in `tool_input.command`. Exit code 2 blocks the operation and feeds the error message back to Claude. See [Hooks](/en/hooks#exit-code-output) for details on exit codes and [Hook input](/en/hooks#pretooluse-input) for the complete input schema.\n\n## Next steps\n\nNow that you understand subagents, explore these related features:\n\n* [Distribute subagents with plugins](/en/plugins) to share subagents across teams or projects\n* [Run Claude Code programmatically](/en/headless) with the Agent SDK for CI/CD and automation\n* [Use MCP servers](/en/mcp) to give subagents access to external tools and data\n"}]},"uuid":"f99de520-54c9-4d5a-932d-eb7f22b19d19","timestamp":"2026-02-23T18:22:14.550Z","sourceToolAssistantUUID":"717124a5-69b7-4e11-a7c0-a6be6a53dd6b"} 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{"parentUuid":"d82d175d-5a9f-425c-9a65-5c17ccd4b9fa","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01ETayayemK5Cs7akqT6RJKk","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# CLI reference\n\n> Complete reference for Claude Code command-line interface, including commands and flags.\n\n## CLI commands\n\n| Command | Description | Example |\n| :------------------------------ | :----------------------------------------------------------------- | :------------------------------------------------ |\n| `claude` | Start interactive REPL | `claude` |\n| `claude \"query\"` | Start REPL with initial prompt | `claude \"explain this project\"` |\n| `claude -p \"query\"` | Query via SDK, then exit | `claude -p \"explain this function\"` |\n| `cat file \\| claude -p \"query\"` | Process piped content | `cat logs.txt \\| claude -p \"explain\"` |\n| `claude -c` | Continue most recent conversation in current directory | `claude -c` |\n| `claude -c -p \"query\"` | Continue via SDK | `claude -c -p \"Check for type errors\"` |\n| `claude -r \"\" \"query\"` | Resume session by ID or name | `claude -r \"auth-refactor\" \"Finish this PR\"` |\n| `claude update` | Update to latest version | `claude update` |\n| `claude agents` | List all configured [subagents](/en/sub-agents), grouped by source | `claude agents` |\n| `claude mcp` | Configure Model Context Protocol (MCP) servers | See the [Claude Code MCP documentation](/en/mcp). |\n\n## CLI flags\n\nCustomize Claude Code's behavior with these command-line flags:\n\n| Flag | Description | Example |\n| :------------------------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------- |\n| `--add-dir` | Add additional working directories for Claude to access (validates each path exists as a directory) | `claude --add-dir ../apps ../lib` |\n| `--agent` | Specify an agent for the current session (overrides the `agent` setting) | `claude --agent my-custom-agent` |\n| `--agents` | Define custom [subagents](/en/sub-agents) dynamically via JSON (see below for format) | `claude --agents '{\"reviewer\":{\"description\":\"Reviews code\",\"prompt\":\"You are a code reviewer\"}}'` |\n| `--allow-dangerously-skip-permissions` | Enable permission bypassing as an option without immediately activating it. Allows composing with `--permission-mode` (use with caution) | `claude --permission-mode plan --allow-dangerously-skip-permissions` |\n| `--allowedTools` | Tools that execute without prompting for permission. See [permission rule syntax](/en/settings#permission-rule-syntax) for pattern matching. To restrict which tools are available, use `--tools` instead | `\"Bash(git log *)\" \"Bash(git diff *)\" \"Read\"` |\n| `--append-system-prompt` | Append custom text to the end of the default system prompt (works in both interactive and print modes) | `claude --append-system-prompt \"Always use TypeScript\"` |\n| `--append-system-prompt-file` | Load additional system prompt text from a file and append to the default prompt (print mode only) | `claude -p --append-system-prompt-file ./extra-rules.txt \"query\"` |\n| `--betas` | Beta headers to include in API requests (API key users only) | `claude --betas interleaved-thinking` |\n| `--chrome` | Enable [Chrome browser integration](/en/chrome) for web automation and testing | `claude --chrome` |\n| `--continue`, `-c` | Load the most recent conversation in the current directory | `claude --continue` |\n| `--dangerously-skip-permissions` | Skip all permission prompts (use with caution) | `claude --dangerously-skip-permissions` |\n| `--debug` | Enable debug mode with optional category filtering (for example, `\"api,hooks\"` or `\"!statsig,!file\"`) | `claude --debug \"api,mcp\"` |\n| `--disable-slash-commands` | Disable all skills and slash commands for this session | `claude --disable-slash-commands` |\n| `--disallowedTools` | Tools that are removed from the model's context and cannot be used | `\"Bash(git log *)\" \"Bash(git diff *)\" \"Edit\"` |\n| `--fallback-model` | Enable automatic fallback to specified model when default model is overloaded (print mode only) | `claude -p --fallback-model sonnet \"query\"` |\n| `--fork-session` | When resuming, create a new session ID instead of reusing the original (use with `--resume` or `--continue`) | `claude --resume abc123 --fork-session` |\n| `--from-pr` | Resume sessions linked to a specific GitHub PR. Accepts a PR number or URL. Sessions are automatically linked when created via `gh pr create` | `claude --from-pr 123` |\n| `--ide` | Automatically connect to IDE on startup if exactly one valid IDE is available | `claude --ide` |\n| `--init` | Run initialization hooks and start interactive mode | `claude --init` |\n| `--init-only` | Run initialization hooks and exit (no interactive session) | `claude --init-only` |\n| `--include-partial-messages` | Include partial streaming events in output (requires `--print` and `--output-format=stream-json`) | `claude -p --output-format stream-json --include-partial-messages \"query\"` |\n| `--input-format` | Specify input format for print mode (options: `text`, `stream-json`) | `claude -p --output-format json --input-format stream-json` |\n| `--json-schema` | Get validated JSON output matching a JSON Schema after agent completes its workflow (print mode only, see [structured outputs](https://platform.claude.com/docs/en/agent-sdk/structured-outputs)) | `claude -p --json-schema '{\"type\":\"object\",\"properties\":{...}}' \"query\"` |\n| `--maintenance` | Run maintenance hooks and exit | `claude --maintenance` |\n| `--max-budget-usd` | Maximum dollar amount to spend on API calls before stopping (print mode only) | `claude -p --max-budget-usd 5.00 \"query\"` |\n| `--max-turns` | Limit the number of agentic turns (print mode only). Exits with an error when the limit is reached. No limit by default | `claude -p --max-turns 3 \"query\"` |\n| `--mcp-config` | Load MCP servers from JSON files or strings (space-separated) | `claude --mcp-config ./mcp.json` |\n| `--model` | Sets the model for the current session with an alias for the latest model (`sonnet` or `opus`) or a model's full name | `claude --model claude-sonnet-4-6` |\n| `--no-chrome` | Disable [Chrome browser integration](/en/chrome) for this session | `claude --no-chrome` |\n| `--no-session-persistence` | Disable session persistence so sessions are not saved to disk and cannot be resumed (print mode only) | `claude -p --no-session-persistence \"query\"` |\n| `--output-format` | Specify output format for print mode (options: `text`, `json`, `stream-json`) | `claude -p \"query\" --output-format json` |\n| `--permission-mode` | Begin in a specified [permission mode](/en/permissions#permission-modes) | `claude --permission-mode plan` |\n| `--permission-prompt-tool` | Specify an MCP tool to handle permission prompts in non-interactive mode | `claude -p --permission-prompt-tool mcp_auth_tool \"query\"` |\n| `--plugin-dir` | Load plugins from directories for this session only (repeatable) | `claude --plugin-dir ./my-plugins` |\n| `--print`, `-p` | Print response without interactive mode (see [Agent SDK documentation](https://platform.claude.com/docs/en/agent-sdk/overview) for programmatic usage details) | `claude -p \"query\"` |\n| `--remote` | Create a new [web session](/en/claude-code-on-the-web) on claude.ai with the provided task description | `claude --remote \"Fix the login bug\"` |\n| `--resume`, `-r` | Resume a specific session by ID or name, or show an interactive picker to choose a session | `claude --resume auth-refactor` |\n| `--session-id` | Use a specific session ID for the conversation (must be a valid UUID) | `claude --session-id \"550e8400-e29b-41d4-a716-446655440000\"` |\n| `--setting-sources` | Comma-separated list of setting sources to load (`user`, `project`, `local`) | `claude --setting-sources user,project` |\n| `--settings` | Path to a settings JSON file or a JSON string to load additional settings from | `claude --settings ./settings.json` |\n| `--strict-mcp-config` | Only use MCP servers from `--mcp-config`, ignoring all other MCP configurations | `claude --strict-mcp-config --mcp-config ./mcp.json` |\n| `--system-prompt` | Replace the entire system prompt with custom text (works in both interactive and print modes) | `claude --system-prompt \"You are a Python expert\"` |\n| `--system-prompt-file` | Load system prompt from a file, replacing the default prompt (print mode only) | `claude -p --system-prompt-file ./custom-prompt.txt \"query\"` |\n| `--teleport` | Resume a [web session](/en/claude-code-on-the-web) in your local terminal | `claude --teleport` |\n| `--teammate-mode` | Set how [agent team](/en/agent-teams) teammates display: `auto` (default), `in-process`, or `tmux`. See [set up agent teams](/en/agent-teams#set-up-agent-teams) | `claude --teammate-mode in-process` |\n| `--tools` | Restrict which built-in tools Claude can use (works in both interactive and print modes). Use `\"\"` to disable all, `\"default\"` for all, or tool names like `\"Bash,Edit,Read\"` | `claude --tools \"Bash,Edit,Read\"` |\n| `--verbose` | Enable verbose logging, shows full turn-by-turn output (helpful for debugging in both print and interactive modes) | `claude --verbose` |\n| `--version`, `-v` | Output the version number | `claude -v` |\n| `--worktree`, `-w` | Start Claude in an isolated [git worktree](/en/common-workflows#run-parallel-claude-code-sessions-with-git-worktrees) at `/.claude/worktrees/`. If no name is given, one is auto-generated | `claude -w feature-auth` |\n\n\n The `--output-format json` flag is particularly useful for scripting and\n automation, allowing you to parse Claude's responses programmatically.\n\n\n### Agents flag format\n\nThe `--agents` flag accepts a JSON object that defines one or more custom subagents. Each subagent requires a unique name (as the key) and a definition object with the following fields:\n\n| Field | Required | Description |\n| :---------------- | :------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| `description` | Yes | Natural language description of when the subagent should be invoked |\n| `prompt` | Yes | The system prompt that guides the subagent's behavior |\n| `tools` | No | Array of specific tools the subagent can use, for example `[\"Read\", \"Edit\", \"Bash\"]`. If omitted, inherits all tools. Supports [`Task(agent_type)`](/en/sub-agents#restrict-which-subagents-can-be-spawned) syntax |\n| `disallowedTools` | No | Array of tool names to explicitly deny for this subagent |\n| `model` | No | Model alias to use: `sonnet`, `opus`, `haiku`, or `inherit`. If omitted, defaults to `inherit` |\n| `skills` | No | Array of [skill](/en/skills) names to preload into the subagent's context |\n| `mcpServers` | No | Array of [MCP servers](/en/mcp) for this subagent. Each entry is a server name string or a `{name: config}` object |\n| `maxTurns` | No | Maximum number of agentic turns before the subagent stops |\n\nExample:\n\n```bash theme={null}\nclaude --agents '{\n \"code-reviewer\": {\n \"description\": \"Expert code reviewer. Use proactively after code changes.\",\n \"prompt\": \"You are a senior code reviewer. Focus on code quality, security, and best practices.\",\n \"tools\": [\"Read\", \"Grep\", \"Glob\", \"Bash\"],\n \"model\": \"sonnet\"\n },\n \"debugger\": {\n \"description\": \"Debugging specialist for errors and test failures.\",\n \"prompt\": \"You are an expert debugger. Analyze errors, identify root causes, and provide fixes.\"\n }\n}'\n```\n\nFor more details on creating and using subagents, see the [subagents documentation](/en/sub-agents).\n\n### System prompt flags\n\nClaude Code provides four flags for customizing the system prompt, each serving a different purpose:\n\n| Flag | Behavior | Modes | Use Case |\n| :---------------------------- | :------------------------------------------ | :------------------ | :------------------------------------------------------------------- |\n| `--system-prompt` | **Replaces** entire default prompt | Interactive + Print | Complete control over Claude's behavior and instructions |\n| `--system-prompt-file` | **Replaces** with file contents | Print only | Load prompts from files for reproducibility and version control |\n| `--append-system-prompt` | **Appends** to default prompt | Interactive + Print | Add specific instructions while keeping default Claude Code behavior |\n| `--append-system-prompt-file` | **Appends** file contents to default prompt | Print only | Load additional instructions from files while keeping defaults |\n\n**When to use each:**\n\n* **`--system-prompt`**: Use when you need complete control over Claude's system prompt. This removes all default Claude Code instructions, giving you a blank slate.\n ```bash theme={null}\n claude --system-prompt \"You are a Python expert who only writes type-annotated code\"\n ```\n\n* **`--system-prompt-file`**: Use when you want to load a custom prompt from a file, useful for team consistency or version-controlled prompt templates.\n ```bash theme={null}\n claude -p --system-prompt-file ./prompts/code-review.txt \"Review this PR\"\n ```\n\n* **`--append-system-prompt`**: Use when you want to add specific instructions while keeping Claude Code's default capabilities intact. This is the safest option for most use cases.\n ```bash theme={null}\n claude --append-system-prompt \"Always use TypeScript and include JSDoc comments\"\n ```\n\n* **`--append-system-prompt-file`**: Use when you want to append instructions from a file while keeping Claude Code's defaults. Useful for version-controlled additions.\n ```bash theme={null}\n claude -p --append-system-prompt-file ./prompts/style-rules.txt \"Review this PR\"\n ```\n\n`--system-prompt` and `--system-prompt-file` are mutually exclusive. The append flags can be used together with either replacement flag.\n\nFor most use cases, `--append-system-prompt` or `--append-system-prompt-file` is recommended as they preserve Claude Code's built-in capabilities while adding your custom requirements. Use `--system-prompt` or `--system-prompt-file` only when you need complete control over the system prompt.\n\n## See also\n\n* [Chrome extension](/en/chrome) - Browser automation and web testing\n* [Interactive mode](/en/interactive-mode) - Shortcuts, input modes, and interactive features\n* [Quickstart guide](/en/quickstart) - Getting started with Claude Code\n* [Common workflows](/en/common-workflows) - Advanced workflows and patterns\n* [Settings](/en/settings) - Configuration options\n* [Agent SDK documentation](https://platform.claude.com/docs/en/agent-sdk/overview) - Programmatic usage and integrations\n"}]},"uuid":"10b87e90-46f1-43ae-917d-905807c1c0eb","timestamp":"2026-02-23T18:22:16.821Z","sourceToolAssistantUUID":"d82d175d-5a9f-425c-9a65-5c17ccd4b9fa"} 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{"parentUuid":"ca79a751-291a-4bc5-a3d0-1f5e19cf0efc","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PUkgy8PxJEmoa5anNrNUFq","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# Claude Code GitHub Actions\n\n> Learn about integrating Claude Code into your development workflow with Claude Code GitHub Actions\n\nClaude Code GitHub Actions brings AI-powered automation to your GitHub workflow. With a simple `@claude` mention in any PR or issue, Claude can analyze your code, create pull requests, implement features, and fix bugs - all while following your project's standards.\n\n\n Claude Code GitHub Actions is built on top of the [Claude\n Agent SDK](https://platform.claude.com/docs/en/agent-sdk/overview), which enables programmatic integration of\n Claude Code into your applications. You can use the SDK to build custom\n automation workflows beyond GitHub Actions.\n\n\n\n **Claude Opus 4.6 is now available.** Claude Code GitHub Actions default to Sonnet. To use Opus 4.6, configure the [model parameter](#breaking-changes-reference) to use `claude-opus-4-6`.\n\n\n## Why use Claude Code GitHub Actions?\n\n* **Instant PR creation**: Describe what you need, and Claude creates a complete PR with all necessary changes\n* **Automated code implementation**: Turn issues into working code with a single command\n* **Follows your standards**: Claude respects your `CLAUDE.md` guidelines and existing code patterns\n* **Simple setup**: Get started in minutes with our installer and API key\n* **Secure by default**: Your code stays on Github's runners\n\n## What can Claude do?\n\nClaude Code provides a powerful GitHub Action that transforms how you work with code:\n\n### Claude Code Action\n\nThis GitHub Action allows you to run Claude Code within your GitHub Actions workflows. You can use this to build any custom workflow on top of Claude Code.\n\n[View repository →](https://github.com/anthropics/claude-code-action)\n\n## Setup\n\n## Quick setup\n\nThe easiest way to set up this action is through Claude Code in the terminal. Just open claude and run `/install-github-app`.\n\nThis command will guide you through setting up the GitHub app and required secrets.\n\n\n * You must be a repository admin to install the GitHub app and add secrets\n * The GitHub app will request read & write permissions for Contents, Issues, and Pull requests\n * This quickstart method is only available for direct Claude API users. If\n you're using AWS Bedrock or Google Vertex AI, please see the [Using with AWS\n Bedrock & Google Vertex AI](#using-with-aws-bedrock-%26-google-vertex-ai)\n section.\n\n\n## Manual setup\n\nIf the `/install-github-app` command fails or you prefer manual setup, please follow these manual setup instructions:\n\n1. **Install the Claude GitHub app** to your repository: [https://github.com/apps/claude](https://github.com/apps/claude)\n\n The Claude GitHub app requires the following repository permissions:\n\n * **Contents**: Read & write (to modify repository files)\n * **Issues**: Read & write (to respond to issues)\n * **Pull requests**: Read & write (to create PRs and push changes)\n\n For more details on security and permissions, see the [security documentation](https://github.com/anthropics/claude-code-action/blob/main/docs/security.md).\n2. **Add ANTHROPIC\\_API\\_KEY** to your repository secrets ([Learn how to use secrets in GitHub Actions](https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions))\n3. **Copy the workflow file** from [examples/claude.yml](https://github.com/anthropics/claude-code-action/blob/main/examples/claude.yml) into your repository's `.github/workflows/`\n\n\n After completing either the quickstart or manual setup, test the action by tagging `@claude` in an issue or PR comment.\n\n\n## Upgrading from Beta\n\n\n Claude Code GitHub Actions v1.0 introduces breaking changes that require updating your workflow files in order to upgrade to v1.0 from the beta version.\n\n\nIf you're currently using the beta version of Claude Code GitHub Actions, we recommend that you update your workflows to use the GA version. The new version simplifies configuration while adding powerful new features like automatic mode detection.\n\n### Essential changes\n\nAll beta users must make these changes to their workflow files in order to upgrade:\n\n1. **Update the action version**: Change `@beta` to `@v1`\n2. **Remove mode configuration**: Delete `mode: \"tag\"` or `mode: \"agent\"` (now auto-detected)\n3. **Update prompt inputs**: Replace `direct_prompt` with `prompt`\n4. **Move CLI options**: Convert `max_turns`, `model`, `custom_instructions`, etc. to `claude_args`\n\n### Breaking Changes Reference\n\n| Old Beta Input | New v1.0 Input |\n| --------------------- | ------------------------------------- |\n| `mode` | *(Removed - auto-detected)* |\n| `direct_prompt` | `prompt` |\n| `override_prompt` | `prompt` with GitHub variables |\n| `custom_instructions` | `claude_args: --append-system-prompt` |\n| `max_turns` | `claude_args: --max-turns` |\n| `model` | `claude_args: --model` |\n| `allowed_tools` | `claude_args: --allowedTools` |\n| `disallowed_tools` | `claude_args: --disallowedTools` |\n| `claude_env` | `settings` JSON format |\n\n### Before and After Example\n\n**Beta version:**\n\n```yaml theme={null}\n- uses: anthropics/claude-code-action@beta\n with:\n mode: \"tag\"\n direct_prompt: \"Review this PR for security issues\"\n anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}\n custom_instructions: \"Follow our coding standards\"\n max_turns: \"10\"\n model: \"claude-sonnet-4-6\"\n```\n\n**GA version (v1.0):**\n\n```yaml theme={null}\n- uses: anthropics/claude-code-action@v1\n with:\n prompt: \"Review this PR for security issues\"\n anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}\n claude_args: |\n --append-system-prompt \"Follow our coding standards\"\n --max-turns 10\n --model claude-sonnet-4-6\n```\n\n\n The action now automatically detects whether to run in interactive mode (responds to `@claude` mentions) or automation mode (runs immediately with a prompt) based on your configuration.\n\n\n## Example use cases\n\nClaude Code GitHub Actions can help you with a variety of tasks. The [examples directory](https://github.com/anthropics/claude-code-action/tree/main/examples) contains ready-to-use workflows for different scenarios.\n\n### Basic workflow\n\n```yaml theme={null}\nname: Claude Code\non:\n issue_comment:\n types: [created]\n pull_request_review_comment:\n types: [created]\njobs:\n claude:\n runs-on: ubuntu-latest\n steps:\n - uses: anthropics/claude-code-action@v1\n with:\n anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}\n # Responds to @claude mentions in comments\n```\n\n### Using skills\n\n```yaml theme={null}\nname: Code Review\non:\n pull_request:\n types: [opened, synchronize]\njobs:\n review:\n runs-on: ubuntu-latest\n steps:\n - uses: anthropics/claude-code-action@v1\n with:\n anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}\n prompt: \"/review\"\n claude_args: \"--max-turns 5\"\n```\n\n### Custom automation with prompts\n\n```yaml theme={null}\nname: Daily Report\non:\n schedule:\n - cron: \"0 9 * * *\"\njobs:\n report:\n runs-on: ubuntu-latest\n steps:\n - uses: anthropics/claude-code-action@v1\n with:\n anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}\n prompt: \"Generate a summary of yesterday's commits and open issues\"\n claude_args: \"--model opus\"\n```\n\n### Common use cases\n\nIn issue or PR comments:\n\n```\n@claude implement this feature based on the issue description\n@claude how should I implement user authentication for this endpoint?\n@claude fix the TypeError in the user dashboard component\n```\n\nClaude will automatically analyze the context and respond appropriately.\n\n## Best practices\n\n### CLAUDE.md configuration\n\nCreate a `CLAUDE.md` file in your repository root to define code style guidelines, review criteria, project-specific rules, and preferred patterns. This file guides Claude's understanding of your project standards.\n\n### Security considerations\n\nNever commit API keys directly to your repository.\n\nFor comprehensive security guidance including permissions, authentication, and best practices, see the [Claude Code Action security documentation](https://github.com/anthropics/claude-code-action/blob/main/docs/security.md).\n\nAlways use GitHub Secrets for API keys:\n\n* Add your API key as a repository secret named `ANTHROPIC_API_KEY`\n* Reference it in workflows: `anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}`\n* Limit action permissions to only what's necessary\n* Review Claude's suggestions before merging\n\nAlways use GitHub Secrets (for example, `${{ secrets.ANTHROPIC_API_KEY }}`) rather than hardcoding API keys directly in your workflow files.\n\n### Optimizing performance\n\nUse issue templates to provide context, keep your `CLAUDE.md` concise and focused, and configure appropriate timeouts for your workflows.\n\n### CI costs\n\nWhen using Claude Code GitHub Actions, be aware of the associated costs:\n\n**GitHub Actions costs:**\n\n* Claude Code runs on GitHub-hosted runners, which consume your GitHub Actions minutes\n* See [GitHub's billing documentation](https://docs.github.com/en/billing/managing-billing-for-your-products/managing-billing-for-github-actions/about-billing-for-github-actions) for detailed pricing and minute limits\n\n**API costs:**\n\n* Each Claude interaction consumes API tokens based on the length of prompts and responses\n* Token usage varies by task complexity and codebase size\n* See [Claude's pricing page](https://claude.com/platform/api) for current token rates\n\n**Cost optimization tips:**\n\n* Use specific `@claude` commands to reduce unnecessary API calls\n* Configure appropriate `--max-turns` in `claude_args` to prevent excessive iterations\n* Set workflow-level timeouts to avoid runaway jobs\n* Consider using GitHub's concurrency controls to limit parallel runs\n\n## Configuration examples\n\nThe Claude Code Action v1 simplifies configuration with unified parameters:\n\n```yaml theme={null}\n- uses: anthropics/claude-code-action@v1\n with:\n anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}\n prompt: \"Your instructions here\" # Optional\n claude_args: \"--max-turns 5\" # Optional CLI arguments\n```\n\nKey features:\n\n* **Unified prompt interface** - Use `prompt` for all instructions\n* **Commands** - Prebuilt prompts like `/review` or `/fix`\n* **CLI passthrough** - Any Claude Code CLI argument via `claude_args`\n* **Flexible triggers** - Works with any GitHub event\n\nVisit the [examples directory](https://github.com/anthropics/claude-code-action/tree/main/examples) for complete workflow files.\n\n\n When responding to issue or PR comments, Claude automatically responds to @claude mentions. For other events, use the `prompt` parameter to provide instructions.\n\n\n## Using with AWS Bedrock & Google Vertex AI\n\nFor enterprise environments, you can use Claude Code GitHub Actions with your own cloud infrastructure. This approach gives you control over data residency and billing while maintaining the same functionality.\n\n### Prerequisites\n\nBefore setting up Claude Code GitHub Actions with cloud providers, you need:\n\n#### For Google Cloud Vertex AI:\n\n1. A Google Cloud Project with Vertex AI enabled\n2. Workload Identity Federation configured for GitHub Actions\n3. A service account with the required permissions\n4. A GitHub App (recommended) or use the default GITHUB\\_TOKEN\n\n#### For AWS Bedrock:\n\n1. An AWS account with Amazon Bedrock enabled\n2. GitHub OIDC Identity Provider configured in AWS\n3. An IAM role with Bedrock permissions\n4. A GitHub App (recommended) or use the default GITHUB\\_TOKEN\n\n\n \n For best control and security when using 3P providers like Vertex AI or Bedrock, we recommend creating your own GitHub App:\n\n 1. Go to [https://github.com/settings/apps/new](https://github.com/settings/apps/new)\n 2. Fill in the basic information:\n * **GitHub App name**: Choose a unique name (e.g., \"YourOrg Claude Assistant\")\n * **Homepage URL**: Your organization's website or the repository URL\n 3. Configure the app settings:\n * **Webhooks**: Uncheck \"Active\" (not needed for this integration)\n 4. Set the required permissions:\n * **Repository permissions**:\n * Contents: Read & Write\n * Issues: Read & Write\n * Pull requests: Read & Write\n 5. Click \"Create GitHub App\"\n 6. After creation, click \"Generate a private key\" and save the downloaded `.pem` file\n 7. Note your App ID from the app settings page\n 8. Install the app to your repository:\n * From your app's settings page, click \"Install App\" in the left sidebar\n * Select your account or organization\n * Choose \"Only select repositories\" and select the specific repository\n * Click \"Install\"\n 9. Add the private key as a secret to your repository:\n * Go to your repository's Settings → Secrets and variables → Actions\n * Create a new secret named `APP_PRIVATE_KEY` with the contents of the `.pem` file\n 10. Add the App ID as a secret:\n\n * Create a new secret named `APP_ID` with your GitHub App's ID\n\n \n This app will be used with the [actions/create-github-app-token](https://github.com/actions/create-github-app-token) action to generate authentication tokens in your workflows.\n \n\n **Alternative for Claude API or if you don't want to setup your own Github app**: Use the official Anthropic app:\n\n 1. Install from: [https://github.com/apps/claude](https://github.com/apps/claude)\n 2. No additional configuration needed for authentication\n \n\n \n Choose your cloud provider and set up secure authentication:\n\n \n \n **Configure AWS to allow GitHub Actions to authenticate securely without storing credentials.**\n\n > **Security Note**: Use repository-specific configurations and grant only the minimum required permissions.\n\n **Required Setup**:\n\n 1. **Enable Amazon Bedrock**:\n * Request access to Claude models in Amazon Bedrock\n * For cross-region models, request access in all required regions\n\n 2. **Set up GitHub OIDC Identity Provider**:\n * Provider URL: `https://token.actions.githubusercontent.com`\n * Audience: `sts.amazonaws.com`\n\n 3. **Create IAM Role for GitHub Actions**:\n * Trusted entity type: Web identity\n * Identity provider: `token.actions.githubusercontent.com`\n * Permissions: `AmazonBedrockFullAccess` policy\n * Configure trust policy for your specific repository\n\n **Required Values**:\n\n After setup, you'll need:\n\n * **AWS\\_ROLE\\_TO\\_ASSUME**: The ARN of the IAM role you created\n\n \n OIDC is more secure than using static AWS access keys because credentials are temporary and automatically rotated.\n \n\n See [AWS documentation](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_create_oidc.html) for detailed OIDC setup instructions.\n \n\n \n **Configure Google Cloud to allow GitHub Actions to authenticate securely without storing credentials.**\n\n > **Security Note**: Use repository-specific configurations and grant only the minimum required permissions.\n\n **Required Setup**:\n\n 1. **Enable APIs** in your Google Cloud project:\n * IAM Credentials API\n * Security Token Service (STS) API\n * Vertex AI API\n\n 2. **Create Workload Identity Federation resources**:\n * Create a Workload Identity Pool\n * Add a GitHub OIDC provider with:\n * Issuer: `https://token.actions.githubusercontent.com`\n * Attribute mappings for repository and owner\n * **Security recommendation**: Use repository-specific attribute conditions\n\n 3. **Create a Service Account**:\n * Grant only `Vertex AI User` role\n * **Security recommendation**: Create a dedicated service account per repository\n\n 4. **Configure IAM bindings**:\n * Allow the Workload Identity Pool to impersonate the service account\n * **Security recommendation**: Use repository-specific principal sets\n\n **Required Values**:\n\n After setup, you'll need:\n\n * **GCP\\_WORKLOAD\\_IDENTITY\\_PROVIDER**: The full provider resource name\n * **GCP\\_SERVICE\\_ACCOUNT**: The service account email address\n\n \n Workload Identity Federation eliminates the need for downloadable service account keys, improving security.\n \n\n For detailed setup instructions, consult the [Google Cloud Workload Identity Federation documentation](https://cloud.google.com/iam/docs/workload-identity-federation).\n \n \n \n\n \n Add the following secrets to your repository (Settings → Secrets and variables → Actions):\n\n #### For Claude API (Direct):\n\n 1. **For API Authentication**:\n * `ANTHROPIC_API_KEY`: Your Claude API key from [console.anthropic.com](https://console.anthropic.com)\n\n 2. **For GitHub App (if using your own app)**:\n * `APP_ID`: Your GitHub App's ID\n * `APP_PRIVATE_KEY`: The private key (.pem) content\n\n #### For Google Cloud Vertex AI\n\n 1. **For GCP Authentication**:\n * `GCP_WORKLOAD_IDENTITY_PROVIDER`\n * `GCP_SERVICE_ACCOUNT`\n\n 2. **For GitHub App (if using your own app)**:\n * `APP_ID`: Your GitHub App's ID\n * `APP_PRIVATE_KEY`: The private key (.pem) content\n\n #### For AWS Bedrock\n\n 1. **For AWS Authentication**:\n * `AWS_ROLE_TO_ASSUME`\n\n 2. **For GitHub App (if using your own app)**:\n * `APP_ID`: Your GitHub App's ID\n * `APP_PRIVATE_KEY`: The private key (.pem) content\n \n\n \n Create GitHub Actions workflow files that integrate with your cloud provider. The examples below show complete configurations for both AWS Bedrock and Google Vertex AI:\n\n \n \n **Prerequisites:**\n\n * AWS Bedrock access enabled with Claude model permissions\n * GitHub configured as an OIDC identity provider in AWS\n * IAM role with Bedrock permissions that trusts GitHub Actions\n\n **Required GitHub secrets:**\n\n | Secret Name | Description |\n | -------------------- | ------------------------------------------------- |\n | `AWS_ROLE_TO_ASSUME` | ARN of the IAM role for Bedrock access |\n | `APP_ID` | Your GitHub App ID (from app settings) |\n | `APP_PRIVATE_KEY` | The private key you generated for your GitHub App |\n\n ```yaml theme={null}\n name: Claude PR Action\n\n permissions:\n contents: write\n pull-requests: write\n issues: write\n id-token: write\n\n on:\n issue_comment:\n types: [created]\n pull_request_review_comment:\n types: [created]\n issues:\n types: [opened, assigned]\n\n jobs:\n claude-pr:\n if: |\n (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||\n (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||\n (github.event_name == 'issues' && contains(github.event.issue.body, '@claude'))\n runs-on: ubuntu-latest\n env:\n AWS_REGION: us-west-2\n steps:\n - name: Checkout repository\n uses: actions/checkout@v4\n\n - name: Generate GitHub App token\n id: app-token\n uses: actions/create-github-app-token@v2\n with:\n app-id: ${{ secrets.APP_ID }}\n private-key: ${{ secrets.APP_PRIVATE_KEY }}\n\n - name: Configure AWS Credentials (OIDC)\n uses: aws-actions/configure-aws-credentials@v4\n with:\n role-to-assume: ${{ secrets.AWS_ROLE_TO_ASSUME }}\n aws-region: us-west-2\n\n - uses: anthropics/claude-code-action@v1\n with:\n github_token: ${{ steps.app-token.outputs.token }}\n use_bedrock: \"true\"\n claude_args: '--model us.anthropic.claude-sonnet-4-6 --max-turns 10'\n ```\n\n \n The model ID format for Bedrock includes a region prefix (for example, `us.anthropic.claude-sonnet-4-6`).\n \n \n\n \n **Prerequisites:**\n\n * Vertex AI API enabled in your GCP project\n * Workload Identity Federation configured for GitHub\n * Service account with Vertex AI permissions\n\n **Required GitHub secrets:**\n\n | Secret Name | Description |\n | -------------------------------- | ------------------------------------------------- |\n | `GCP_WORKLOAD_IDENTITY_PROVIDER` | Workload identity provider resource name |\n | `GCP_SERVICE_ACCOUNT` | Service account email with Vertex AI access |\n | `APP_ID` | Your GitHub App ID (from app settings) |\n | `APP_PRIVATE_KEY` | The private key you generated for your GitHub App |\n\n ```yaml theme={null}\n name: Claude PR Action\n\n permissions:\n contents: write\n pull-requests: write\n issues: write\n id-token: write\n\n on:\n issue_comment:\n types: [created]\n pull_request_review_comment:\n types: [created]\n issues:\n types: [opened, assigned]\n\n jobs:\n claude-pr:\n if: |\n (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||\n (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||\n (github.event_name == 'issues' && contains(github.event.issue.body, '@claude'))\n runs-on: ubuntu-latest\n steps:\n - name: Checkout repository\n uses: actions/checkout@v4\n\n - name: Generate GitHub App token\n id: app-token\n uses: actions/create-github-app-token@v2\n with:\n app-id: ${{ secrets.APP_ID }}\n private-key: ${{ secrets.APP_PRIVATE_KEY }}\n\n - name: Authenticate to Google Cloud\n id: auth\n uses: google-github-actions/auth@v2\n with:\n workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}\n service_account: ${{ secrets.GCP_SERVICE_ACCOUNT }}\n\n - uses: anthropics/claude-code-action@v1\n with:\n github_token: ${{ steps.app-token.outputs.token }}\n trigger_phrase: \"@claude\"\n use_vertex: \"true\"\n claude_args: '--model claude-sonnet-4@20250514 --max-turns 10'\n env:\n ANTHROPIC_VERTEX_PROJECT_ID: ${{ steps.auth.outputs.project_id }}\n CLOUD_ML_REGION: us-east5\n VERTEX_REGION_CLAUDE_3_7_SONNET: us-east5\n ```\n\n \n The project ID is automatically retrieved from the Google Cloud authentication step, so you don't need to hardcode it.\n \n \n \n \n\n\n## Troubleshooting\n\n### Claude not responding to @claude commands\n\nVerify the GitHub App is installed correctly, check that workflows are enabled, ensure API key is set in repository secrets, and confirm the comment contains `@claude` (not `/claude`).\n\n### CI not running on Claude's commits\n\nEnsure you're using the GitHub App or custom app (not Actions user), check workflow triggers include the necessary events, and verify app permissions include CI triggers.\n\n### Authentication errors\n\nConfirm API key is valid and has sufficient permissions. For Bedrock/Vertex, check credentials configuration and ensure secrets are named correctly in workflows.\n\n## Advanced configuration\n\n### Action parameters\n\nThe Claude Code Action v1 uses a simplified configuration:\n\n| Parameter | Description | Required |\n| ------------------- | ------------------------------------------------------ | -------- |\n| `prompt` | Instructions for Claude (text or skill like `/review`) | No\\* |\n| `claude_args` | CLI arguments passed to Claude Code | No |\n| `anthropic_api_key` | Claude API key | Yes\\*\\* |\n| `github_token` | GitHub token for API access | No |\n| `trigger_phrase` | Custom trigger phrase (default: \"@claude\") | No |\n| `use_bedrock` | Use AWS Bedrock instead of Claude API | No |\n| `use_vertex` | Use Google Vertex AI instead of Claude API | No |\n\n\\*Prompt is optional - when omitted for issue/PR comments, Claude responds to trigger phrase\\\n\\*\\*Required for direct Claude API, not for Bedrock/Vertex\n\n#### Pass CLI arguments\n\nThe `claude_args` parameter accepts any Claude Code CLI arguments:\n\n```yaml theme={null}\nclaude_args: \"--max-turns 5 --model claude-sonnet-4-6 --mcp-config /path/to/config.json\"\n```\n\nCommon arguments:\n\n* `--max-turns`: Maximum conversation turns (default: 10)\n* `--model`: Model to use (for example, `claude-sonnet-4-6`)\n* `--mcp-config`: Path to MCP configuration\n* `--allowed-tools`: Comma-separated list of allowed tools\n* `--debug`: Enable debug output\n\n### Alternative integration methods\n\nWhile the `/install-github-app` command is the recommended approach, you can also:\n\n* **Custom GitHub App**: For organizations needing branded usernames or custom authentication flows. Create your own GitHub App with required permissions (contents, issues, pull requests) and use the actions/create-github-app-token action to generate tokens in your workflows.\n* **Manual GitHub Actions**: Direct workflow configuration for maximum flexibility\n* **MCP Configuration**: Dynamic loading of Model Context Protocol servers\n\nSee the [Claude Code Action documentation](https://github.com/anthropics/claude-code-action/blob/main/docs) for detailed guides on authentication, security, and advanced configuration.\n\n### Customizing Claude's behavior\n\nYou can configure Claude's behavior in two ways:\n\n1. **CLAUDE.md**: Define coding standards, review criteria, and project-specific rules in a `CLAUDE.md` file at the root of your repository. Claude will follow these guidelines when creating PRs and responding to requests. Check out our [Memory documentation](/en/memory) for more details.\n2. **Custom prompts**: Use the `prompt` parameter in the workflow file to provide workflow-specific instructions. This allows you to customize Claude's behavior for different workflows or tasks.\n\nClaude will follow these guidelines when creating PRs and responding to requests.\n"}]},"uuid":"69a6855e-702c-47cf-b6ad-ab4d0726e8ae","timestamp":"2026-02-23T18:22:37.697Z","sourceToolAssistantUUID":"ca79a751-291a-4bc5-a3d0-1f5e19cf0efc"} {"parentUuid":"69a6855e-702c-47cf-b6ad-ab4d0726e8ae","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/auto_respawn.py"},"parentToolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","toolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","timestamp":"2026-02-23T18:22:38.406Z","uuid":"ab8633b5-072d-480b-a2bf-17026d150757"} {"parentUuid":"ab8633b5-072d-480b-a2bf-17026d150757","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/observability_logger.py"},"parentToolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","toolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","timestamp":"2026-02-23T18:22:38.406Z","uuid":"65bf3c70-9b56-401e-90e8-af3c3260f9e3"} {"parentUuid":"65bf3c70-9b56-401e-90e8-af3c3260f9e3","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/session_heartbeat.py"},"parentToolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","toolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","timestamp":"2026-02-23T18:22:38.406Z","uuid":"cdacfe51-b82a-40d8-8f80-ebe46f62a0c1"} {"parentUuid":"cdacfe51-b82a-40d8-8f80-ebe46f62a0c1","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/thinking_block_monitor.py"},"parentToolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","toolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","timestamp":"2026-02-23T18:22:38.406Z","uuid":"c0e76288-c2ae-4707-a59e-739ebf884f47"} {"parentUuid":"c0e76288-c2ae-4707-a59e-739ebf884f47","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"wsl.exe -e python3 /mnt/e/genesis-system/.claude/hooks/weekly_usage_tracker.py"},"parentToolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","toolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","timestamp":"2026-02-23T18:22:38.406Z","uuid":"a995e1cc-f228-4ecb-95a3-1107bc6c5169"} {"parentUuid":"a995e1cc-f228-4ecb-95a3-1107bc6c5169","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:WebFetch","command":"python3 ${CLAUDE_PLUGIN_ROOT}/hooks/posttooluse.py"},"parentToolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","toolUseID":"toolu_0118SySd3sAcwLTXK5XbcgW3","timestamp":"2026-02-23T18:22:38.406Z","uuid":"2fa48cf2-960f-45db-9165-cd99f1fdc2ce"} {"parentUuid":"002f4263-4f27-4189-9a42-ab9634178198","isSidechain":true,"userType":"external","cwd":"E:\\genesis-system\\.claude\\worktrees\\intelligent-yalow","sessionId":"33416e9e-62b6-4767-99d5-17d794f37f45","version":"2.1.41","gitBranch":"claude/intelligent-yalow","agentId":"a54165b","slug":"swift-imagining-prism","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_0118SySd3sAcwLTXK5XbcgW3","type":"tool_result","content":"> ## Documentation Index\n> Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt\n> Use this file to discover all available pages before exploring further.\n\n# Best Practices for Claude Code\n\n> Tips and patterns for getting the most out of Claude Code, from configuring your environment to scaling across parallel sessions.\n\nClaude Code is an agentic coding environment. Unlike a chatbot that answers questions and waits, Claude Code can read your files, run commands, make changes, and autonomously work through problems while you watch, redirect, or step away entirely.\n\nThis changes how you work. Instead of writing code yourself and asking Claude to review it, you describe what you want and Claude figures out how to build it. Claude explores, plans, and implements.\n\nBut this autonomy still comes with a learning curve. Claude works within certain constraints you need to understand.\n\nThis guide covers patterns that have proven effective across Anthropic's internal teams and for engineers using Claude Code across various codebases, languages, and environments. For how the agentic loop works under the hood, see [How Claude Code works](/en/how-claude-code-works).\n\n***\n\nMost best practices are based on one constraint: Claude's context window fills up fast, and performance degrades as it fills.\n\nClaude's context window holds your entire conversation, including every message, every file Claude reads, and every command output. However, this can fill up fast. A single debugging session or codebase exploration might generate and consume tens of thousands of tokens.\n\nThis matters since LLM performance degrades as context fills. When the context window is getting full, Claude may start \"forgetting\" earlier instructions or making more mistakes. The context window is the most important resource to manage. Track context usage continuously with a [custom status line](/en/statusline), and see [Reduce token usage](/en/costs#reduce-token-usage) for strategies on reducing token usage.\n\n***\n\n## Give Claude a way to verify its work\n\n\n Include tests, screenshots, or expected outputs so Claude can check itself. This is the single highest-leverage thing you can do.\n\n\nClaude performs dramatically better when it can verify its own work, like run tests, compare screenshots, and validate outputs.\n\nWithout clear success criteria, it might produce something that looks right but actually doesn't work. You become the only feedback loop, and every mistake requires your attention.\n\n| Strategy | Before | After |\n| ------------------------------------- | ------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| **Provide verification criteria** | *\"implement a function that validates email addresses\"* | *\"write a validateEmail function. example test cases: [user@example.com](mailto:user@example.com) is true, invalid is false, [user@.com](mailto:user@.com) is false. run the tests after implementing\"* |\n| **Verify UI changes visually** | *\"make the dashboard look better\"* | *\"\\[paste screenshot] implement this design. take a screenshot of the result and compare it to the original. list differences and fix them\"* |\n| **Address root causes, not symptoms** | *\"the build is failing\"* | *\"the build fails with this error: \\[paste error]. fix it and verify the build succeeds. address the root cause, don't suppress the error\"* |\n\nUI changes can be verified using the [Claude in Chrome extension](/en/chrome). It opens new tabs in your browser, tests the UI, and iterates until the code works.\n\nYour verification can also be a test suite, a linter, or a Bash command that checks output. Invest in making your verification rock-solid.\n\n***\n\n## Explore first, then plan, then code\n\n\n Separate research and planning from implementation to avoid solving the wrong problem.\n\n\nLetting Claude jump straight to coding can produce code that solves the wrong problem. Use [Plan Mode](/en/common-workflows#use-plan-mode-for-safe-code-analysis) to separate exploration from execution.\n\nThe recommended workflow has four phases:\n\n\n \n Enter Plan Mode. Claude reads files and answers questions without making changes.\n\n ```txt claude (Plan Mode) theme={null}\n read /src/auth and understand how we handle sessions and login.\n also look at how we manage environment variables for secrets.\n ```\n \n\n \n Ask Claude to create a detailed implementation plan.\n\n ```txt claude (Plan Mode) theme={null}\n I want to add Google OAuth. What files need to change?\n What's the session flow? Create a plan.\n ```\n\n Press `Ctrl+G` to open the plan in your text editor for direct editing before Claude proceeds.\n \n\n \n Switch back to Normal Mode and let Claude code, verifying against its plan.\n\n ```txt claude (Normal Mode) theme={null}\n implement the OAuth flow from your plan. write tests for the\n callback handler, run the test suite and fix any failures.\n ```\n \n\n \n Ask Claude to commit with a descriptive message and create a PR.\n\n ```txt claude (Normal Mode) theme={null}\n commit with a descriptive message and open a PR\n ```\n \n\n\n\n Plan Mode is useful, but also adds overhead.\n\n For tasks where the scope is clear and the fix is small (like fixing a typo, adding a log line, or renaming a variable) ask Claude to do it directly.\n\n Planning is most useful when you're uncertain about the approach, when the change modifies multiple files, or when you're unfamiliar with the code being modified. If you could describe the diff in one sentence, skip the plan.\n\n\n***\n\n## Provide specific context in your prompts\n\n\n The more precise your instructions, the fewer corrections you'll need.\n\n\nClaude can infer intent, but it can't read your mind. Reference specific files, mention constraints, and point to example patterns.\n\n| Strategy | Before | After |\n| ------------------------------------------------------------------------------------------------ | ---------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| **Scope the task.** Specify which file, what scenario, and testing preferences. | *\"add tests for foo.py\"* | *\"write a test for foo.py covering the edge case where the user is logged out. avoid mocks.\"* |\n| **Point to sources.** Direct Claude to the source that can answer a question. | *\"why does ExecutionFactory have such a weird api?\"* | *\"look through ExecutionFactory's git history and summarize how its api came to be\"* |\n| **Reference existing patterns.** Point Claude to patterns in your codebase. | *\"add a calendar widget\"* | *\"look at how existing widgets are implemented on the home page to understand the patterns. HotDogWidget.php is a good example. follow the pattern to implement a new calendar widget that lets the user select a month and paginate forwards/backwards to pick a year. build from scratch without libraries other than the ones already used in the codebase.\"* |\n| **Describe the symptom.** Provide the symptom, the likely location, and what \"fixed\" looks like. | *\"fix the login bug\"* | *\"users report that login fails after session timeout. check the auth flow in src/auth/, especially token refresh. write a failing test that reproduces the issue, then fix it\"* |\n\nVague prompts can be useful when you're exploring and can afford to course-correct. A prompt like `\"what would you improve in this file?\"` can surface things you wouldn't have thought to ask about.\n\n### Provide rich content\n\n\n Use `@` to reference files, paste screenshots/images, or pipe data directly.\n\n\nYou can provide rich data to Claude in several ways:\n\n* **Reference files with `@`** instead of describing where code lives. Claude reads the file before responding.\n* **Paste images directly**. Copy/paste or drag and drop images into the prompt.\n* **Give URLs** for documentation and API references. Use `/permissions` to allowlist frequently-used domains.\n* **Pipe in data** by running `cat error.log | claude` to send file contents directly.\n* **Let Claude fetch what it needs**. Tell Claude to pull context itself using Bash commands, MCP tools, or by reading files.\n\n***\n\n## Configure your environment\n\nA few setup steps make Claude Code significantly more effective across all your sessions. For a full overview of extension features and when to use each one, see [Extend Claude Code](/en/features-overview).\n\n### Write an effective CLAUDE.md\n\n\n Run `/init` to generate a starter CLAUDE.md file based on your current project structure, then refine over time.\n\n\nCLAUDE.md is a special file that Claude reads at the start of every conversation. Include Bash commands, code style, and workflow rules. This gives Claude persistent context **it can't infer from code alone**.\n\nThe `/init` command analyzes your codebase to detect build systems, test frameworks, and code patterns, giving you a solid foundation to refine.\n\nThere's no required format for CLAUDE.md files, but keep it short and human-readable. For example:\n\n```markdown CLAUDE.md theme={null}\n# Code style\n- Use ES modules (import/export) syntax, not CommonJS (require)\n- Destructure imports when possible (eg. import { foo } from 'bar')\n\n# Workflow\n- Be sure to typecheck when you're done making a series of code changes\n- Prefer running single tests, and not the whole test suite, for performance\n```\n\nCLAUDE.md is loaded every session, so only include things that apply broadly. For domain knowledge or workflows that are only relevant sometimes, use [skills](/en/skills) instead. Claude loads them on demand without bloating every conversation.\n\nKeep it concise. For each line, ask: *\"Would removing this cause Claude to make mistakes?\"* If not, cut it. Bloated CLAUDE.md files cause Claude to ignore your actual instructions!\n\n| ✅ Include | ❌ Exclude |\n| ---------------------------------------------------- | -------------------------------------------------- |\n| Bash commands Claude can't guess | Anything Claude can figure out by reading code |\n| Code style rules that differ from defaults | Standard language conventions Claude already knows |\n| Testing instructions and preferred test runners | Detailed API documentation (link to docs instead) |\n| Repository etiquette (branch naming, PR conventions) | Information that changes frequently |\n| Architectural decisions specific to your project | Long explanations or tutorials |\n| Developer environment quirks (required env vars) | File-by-file descriptions of the codebase |\n| Common gotchas or non-obvious behaviors | Self-evident practices like \"write clean code\" |\n\nIf Claude keeps doing something you don't want despite having a rule against it, the file is probably too long and the rule is getting lost. If Claude asks you questions that are answered in CLAUDE.md, the phrasing might be ambiguous. Treat CLAUDE.md like code: review it when things go wrong, prune it regularly, and test changes by observing whether Claude's behavior actually shifts.\n\nYou can tune instructions by adding emphasis (e.g., \"IMPORTANT\" or \"YOU MUST\") to improve adherence. Check CLAUDE.md into git so your team can contribute. The file compounds in value over time.\n\nCLAUDE.md files can import additional files using `@path/to/import` syntax:\n\n```markdown CLAUDE.md theme={null}\nSee @README.md for project overview and @package.json for available npm commands.\n\n# Additional Instructions\n- Git workflow: @docs/git-instructions.md\n- Personal overrides: @~/.claude/my-project-instructions.md\n```\n\nYou can place CLAUDE.md files in several locations:\n\n* **Home folder (`~/.claude/CLAUDE.md`)**: Applies to all Claude sessions\n* **Project root (`./CLAUDE.md`)**: Check into git to share with your team, or name it `CLAUDE.local.md` and `.gitignore` it\n* **Parent directories**: Useful for monorepos where both `root/CLAUDE.md` and `root/foo/CLAUDE.md` are pulled in automatically\n* **Child directories**: Claude pulls in child CLAUDE.md files on demand when working with files in those directories\n\n### Configure permissions\n\n\n Use `/permissions` to allowlist safe commands or `/sandbox` for OS-level isolation. This reduces interruptions while keeping you in control.\n\n\nBy default, Claude Code requests permission for actions that might modify your system: file writes, Bash commands, MCP tools, etc. This is safe but tedious. After the tenth approval you're not really reviewing anymore, you're just clicking through. There are two ways to reduce these interruptions:\n\n* **Permission allowlists**: Permit specific tools you know are safe (like `npm run lint` or `git commit`)\n* **Sandboxing**: Enable OS-level isolation that restricts filesystem and network access, allowing Claude to work more freely within defined boundaries\n\nAlternatively, use `--dangerously-skip-permissions` to bypass all permission checks for contained workflows like fixing lint errors or generating boilerplate.\n\n\n Letting Claude run arbitrary commands can result in data loss, system corruption, or data exfiltration via prompt injection. Only use `--dangerously-skip-permissions` in a sandbox without internet access.\n\n\nRead more about [configuring permissions](/en/settings) and [enabling sandboxing](/en/sandboxing#sandboxing).\n\n### Use CLI tools\n\n\n Tell Claude Code to use CLI tools like `gh`, `aws`, `gcloud`, and `sentry-cli` when interacting with external services.\n\n\nCLI tools are the most context-efficient way to interact with external services. If you use GitHub, install the `gh` CLI. Claude knows how to use it for creating issues, opening pull requests, and reading comments. Without `gh`, Claude can still use the GitHub API, but unauthenticated requests often hit rate limits.\n\nClaude is also effective at learning CLI tools it doesn't already know. Try prompts like `Use 'foo-cli-tool --help' to learn about foo tool, then use it to solve A, B, C.`\n\n### Connect MCP servers\n\n\n Run `claude mcp add` to connect external tools like Notion, Figma, or your database.\n\n\nWith [MCP servers](/en/mcp), you can ask Claude to implement features from issue trackers, query databases, analyze monitoring data, integrate designs from Figma, and automate workflows.\n\n### Set up hooks\n\n\n Use hooks for actions that must happen every time with zero exceptions.\n\n\n[Hooks](/en/hooks-guide) run scripts automatically at specific points in Claude's workflow. Unlike CLAUDE.md instructions which are advisory, hooks are deterministic and guarantee the action happens.\n\nClaude can write hooks for you. Try prompts like *\"Write a hook that runs eslint after every file edit\"* or *\"Write a hook that blocks writes to the migrations folder.\"* Run `/hooks` for interactive configuration, or edit `.claude/settings.json` directly.\n\n### Create skills\n\n\n Create `SKILL.md` files in `.claude/skills/` to give Claude domain knowledge and reusable workflows.\n\n\n[Skills](/en/skills) extend Claude's knowledge with information specific to your project, team, or domain. Claude applies them automatically when relevant, or you can invoke them directly with `/skill-name`.\n\nCreate a skill by adding a directory with a `SKILL.md` to `.claude/skills/`:\n\n```markdown .claude/skills/api-conventions/SKILL.md theme={null}\n---\nname: api-conventions\ndescription: REST API design conventions for our services\n---\n# API Conventions\n- Use kebab-case for URL paths\n- Use camelCase for JSON properties\n- Always include pagination for list endpoints\n- Version APIs in the URL path (/v1/, /v2/)\n```\n\nSkills can also define repeatable workflows you invoke directly:\n\n```markdown .claude/skills/fix-issue/SKILL.md theme={null}\n---\nname: fix-issue\ndescription: Fix a GitHub issue\ndisable-model-invocation: true\n---\nAnalyze and fix the GitHub issue: $ARGUMENTS.\n\n1. Use `gh issue view` to get the issue details\n2. Understand the problem described in the issue\n3. Search the codebase for relevant files\n4. Implement the necessary changes to fix the issue\n5. Write and run tests to verify the fix\n6. Ensure code passes linting and type checking\n7. Create a descriptive commit message\n8. Push and create a PR\n```\n\nRun `/fix-issue 1234` to invoke it. Use `disable-model-invocation: true` for workflows with side effects that you want to trigger manually.\n\n### Create custom subagents\n\n\n Define specialized assistants in `.claude/agents/` that Claude can delegate to for isolated tasks.\n\n\n[Subagents](/en/sub-agents) run in their own context with their own set of allowed tools. They're useful for tasks that read many files or need specialized focus without cluttering your main conversation.\n\n```markdown .claude/agents/security-reviewer.md theme={null}\n---\nname: security-reviewer\ndescription: Reviews code for security vulnerabilities\ntools: Read, Grep, Glob, Bash\nmodel: opus\n---\nYou are a senior security engineer. Review code for:\n- Injection vulnerabilities (SQL, XSS, command injection)\n- Authentication and authorization flaws\n- Secrets or credentials in code\n- Insecure data handling\n\nProvide specific line references and suggested fixes.\n```\n\nTell Claude to use subagents explicitly: *\"Use a subagent to review this code for security issues.\"*\n\n### Install plugins\n\n\n Run `/plugin` to browse the marketplace. Plugins add skills, tools, and integrations without configuration.\n\n\n[Plugins](/en/plugins) bundle skills, hooks, subagents, and MCP servers into a single installable unit from the community and Anthropic. If you work with a typed language, install a [code intelligence plugin](/en/discover-plugins#code-intelligence) to give Claude precise symbol navigation and automatic error detection after edits.\n\nFor guidance on choosing between skills, subagents, hooks, and MCP, see [Extend Claude Code](/en/features-overview#match-features-to-your-goal).\n\n***\n\n## Communicate effectively\n\nThe way you communicate with Claude Code significantly impacts the quality of results.\n\n### Ask codebase questions\n\n\n Ask Claude questions you'd ask a senior engineer.\n\n\nWhen onboarding to a new codebase, use Claude Code for learning and exploration. You can ask Claude the same sorts of questions you would ask another engineer:\n\n* How does logging work?\n* How do I make a new API endpoint?\n* What does `async move { ... }` do on line 134 of `foo.rs`?\n* What edge cases does `CustomerOnboardingFlowImpl` handle?\n* Why does this code call `foo()` instead of `bar()` on line 333?\n\nUsing Claude Code this way is an effective onboarding workflow, improving ramp-up time and reducing load on other engineers. No special prompting required: ask questions directly.\n\n### Let Claude interview you\n\n\n For larger features, have Claude interview you first. Start with a minimal prompt and ask Claude to interview you using the `AskUserQuestion` tool.\n\n\nClaude asks about things you might not have considered yet, including technical implementation, UI/UX, edge cases, and tradeoffs.\n\n```\nI want to build [brief description]. Interview me in detail using the AskUserQuestion tool.\n\nAsk about technical implementation, UI/UX, edge cases, concerns, and tradeoffs. Don't ask obvious questions, dig into the hard parts I might not have considered.\n\nKeep interviewing until we've covered everything, then write a complete spec to SPEC.md.\n```\n\nOnce the spec is complete, start a fresh session to execute it. The new session has clean context focused entirely on implementation, and you have a written spec to reference.\n\n***\n\n## Manage your session\n\nConversations are persistent and reversible. Use this to your advantage!\n\n### Course-correct early and often\n\n\n Correct Claude as soon as you notice it going off track.\n\n\nThe best results come from tight feedback loops. Though Claude occasionally solves problems perfectly on the first attempt, correcting it quickly generally produces better solutions faster.\n\n* **`Esc`**: Stop Claude mid-action with the `Esc` key. Context is preserved, so you can redirect.\n* **`Esc + Esc` or `/rewind`**: Press `Esc` twice or run `/rewind` to open the rewind menu and restore previous conversation and code state, or summarize from a selected message.\n* **`\"Undo that\"`**: Have Claude revert its changes.\n* **`/clear`**: Reset context between unrelated tasks. Long sessions with irrelevant context can reduce performance.\n\nIf you've corrected Claude more than twice on the same issue in one session, the context is cluttered with failed approaches. Run `/clear` and start fresh with a more specific prompt that incorporates what you learned. A clean session with a better prompt almost always outperforms a long session with accumulated corrections.\n\n### Manage context aggressively\n\n\n Run `/clear` between unrelated tasks to reset context.\n\n\nClaude Code automatically compacts conversation history when you approach context limits, which preserves important code and decisions while freeing space.\n\nDuring long sessions, Claude's context window can fill with irrelevant conversation, file contents, and commands. This can reduce performance and sometimes distract Claude.\n\n* Use `/clear` frequently between tasks to reset the context window entirely\n* When auto compaction triggers, Claude summarizes what matters most, including code patterns, file states, and key decisions\n* For more control, run `/compact `, like `/compact Focus on the API changes`\n* To compact only part of the conversation, use `Esc + Esc` or `/rewind`, select a message checkpoint, and choose **Summarize from here**. This condenses messages from that point forward while keeping earlier context intact.\n* Customize compaction behavior in CLAUDE.md with instructions like `\"When compacting, always preserve the full list of modified files and any test commands\"` to ensure critical context survives summarization\n\n### Use subagents for investigation\n\n\n Delegate research with `\"use subagents to investigate X\"`. They explore in a separate context, keeping your main conversation clean for implementation.\n\n\nSince context is your fundamental constraint, subagents are one of the most powerful tools available. When Claude researches a codebase it reads lots of files, all of which consume your context. Subagents run in separate context windows and report back summaries:\n\n```\nUse subagents to investigate how our authentication system handles token\nrefresh, and whether we have any existing OAuth utilities I should reuse.\n```\n\nThe subagent explores the codebase, reads relevant files, and reports back with findings, all without cluttering your main conversation.\n\nYou can also use subagents for verification after Claude implements something:\n\n```\nuse a subagent to review this code for edge cases\n```\n\n### Rewind with checkpoints\n\n\n Every action Claude makes creates a checkpoint. You can restore conversation, code, or both to any previous checkpoint.\n\n\nClaude automatically checkpoints before changes. Double-tap `Escape` or run `/rewind` to open the rewind menu. You can restore conversation only, restore code only, restore both, or summarize from a selected message. See [Checkpointing](/en/checkpointing) for details.\n\nInstead of carefully planning every move, you can tell Claude to try something risky. If it doesn't work, rewind and try a different approach. Checkpoints persist across sessions, so you can close your terminal and still rewind later.\n\n\n Checkpoints only track changes made *by Claude*, not external processes. This isn't a replacement for git.\n\n\n### Resume conversations\n\n\n Run `claude --continue` to pick up where you left off, or `--resume` to choose from recent sessions.\n\n\nClaude Code saves conversations locally. When a task spans multiple sessions (you start a feature, get interrupted, come back the next day) you don't have to re-explain the context:\n\n```bash theme={null}\nclaude --continue # Resume the most recent conversation\nclaude --resume # Select from recent conversations\n```\n\nUse `/rename` to give sessions descriptive names (`\"oauth-migration\"`, `\"debugging-memory-leak\"`) so you can find them later. Treat sessions like branches. Different workstreams can have separate, persistent contexts.\n\n***\n\n## Automate and scale\n\nOnce you're effective with one Claude, multiply your output with parallel sessions, headless mode, and fan-out patterns.\n\nEverything so far assumes one human, one Claude, and one conversation. But Claude Code scales horizontally. The techniques in this section show how you can get more done.\n\n### Run headless mode\n\n\n Use `claude -p \"prompt\"` in CI, pre-commit hooks, or scripts. Add `--output-format stream-json` for streaming JSON output.\n\n\nWith `claude -p \"your prompt\"`, you can run Claude headlessly, without an interactive session. Headless mode is how you integrate Claude into CI pipelines, pre-commit hooks, or any automated workflow. The output formats (plain text, JSON, streaming JSON) let you parse results programmatically.\n\n```bash theme={null}\n# One-off queries\nclaude -p \"Explain what this project does\"\n\n# Structured output for scripts\nclaude -p \"List all API endpoints\" --output-format json\n\n# Streaming for real-time processing\nclaude -p \"Analyze this log file\" --output-format stream-json\n```\n\n### Run multiple Claude sessions\n\n\n Run multiple Claude sessions in parallel to speed up development, run isolated experiments, or start complex workflows.\n\n\nThere are three main ways to run parallel sessions:\n\n* [Claude Code desktop app](/en/desktop#work-in-parallel-with-sessions): Manage multiple local sessions visually. Each session gets its own isolated worktree.\n* [Claude Code on the web](/en/claude-code-on-the-web): Run on Anthropic's secure cloud infrastructure in isolated VMs.\n* [Agent teams](/en/agent-teams): Automated coordination of multiple sessions with shared tasks, messaging, and a team lead.\n\nBeyond parallelizing work, multiple sessions enable quality-focused workflows. A fresh context improves code review since Claude won't be biased toward code it just wrote.\n\nFor example, use a Writer/Reviewer pattern:\n\n| Session A (Writer) | Session B (Reviewer) |\n| ----------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| `Implement a rate limiter for our API endpoints` | |\n| | `Review the rate limiter implementation in @src/middleware/rateLimiter.ts. Look for edge cases, race conditions, and consistency with our existing middleware patterns.` |\n| `Here's the review feedback: [Session B output]. Address these issues.` | |\n\nYou can do something similar with tests: have one Claude write tests, then another write code to pass them.\n\n### Fan out across files\n\n\n Loop through tasks calling `claude -p` for each. Use `--allowedTools` to scope permissions for batch operations.\n\n\nFor large migrations or analyses, you can distribute work across many parallel Claude invocations:\n\n\n \n Have Claude list all files that need migrating (e.g., `list all 2,000 Python files that need migrating`)\n \n\n \n ```bash theme={null}\n for file in $(cat files.txt); do\n claude -p \"Migrate $file from React to Vue. Return OK or FAIL.\" \\\n --allowedTools \"Edit,Bash(git commit *)\"\n done\n ```\n \n\n \n Refine your prompt based on what goes wrong with the first 2-3 files, then run on the full set. The `--allowedTools` flag restricts what Claude can do, which matters when you're running unattended.\n \n\n\nYou can also integrate Claude into existing data/processing pipelines:\n\n```bash theme={null}\nclaude -p \"\" --output-format json | your_command\n```\n\nUse `--verbose` for debugging during development, and turn it off in production.\n\n### Safe Autonomous Mode\n\nUse `claude --dangerously-skip-permissions` to bypass all permission checks and let Claude work uninterrupted. This works well for workflows like fixing lint errors or generating boilerplate code.\n\n\n Letting Claude run arbitrary commands is risky and can result in data loss, system corruption, or data exfiltration (e.g., via prompt injection attacks). To minimize these risks, use `--dangerously-skip-permissions` in a container without internet access.\n\n With sandboxing enabled (`/sandbox`), you get similar autonomy with better security. Sandbox defines upfront boundaries rather than bypassing all checks.\n\n\n***\n\n## Avoid common failure patterns\n\nThese are common mistakes. Recognizing them early saves time:\n\n* **The kitchen sink session.** You start with one task, then ask Claude something unrelated, then go back to the first task. Context is full of irrelevant information.\n > **Fix**: `/clear` between unrelated tasks.\n* **Correcting over and over.** Claude does something wrong, you correct it, it's still wrong, you correct again. Context is polluted with failed approaches.\n > **Fix**: After two failed corrections, `/clear` and write a better initial prompt incorporating what you learned.\n* **The over-specified CLAUDE.md.** If your CLAUDE.md is too long, Claude ignores half of it because important rules get lost in the noise.\n > **Fix**: Ruthlessly prune. If Claude already does something correctly without the instruction, delete it or convert it to a hook.\n* **The trust-then-verify gap.** Claude produces a plausible-looking implementation that doesn't handle edge cases.\n > **Fix**: Always provide verification (tests, scripts, screenshots). If you can't verify it, don't ship it.\n* **The infinite exploration.** You ask Claude to \"investigate\" something without scoping it. Claude reads hundreds of files, filling the context.\n > **Fix**: Scope investigations narrowly or use subagents so the exploration doesn't consume your main context.\n\n***\n\n## Develop your intuition\n\nThe patterns in this guide aren't set in stone. They're starting points that work well in general, but might not be optimal for every situation.\n\nSometimes you *should* let context accumulate because you're deep in one complex problem and the history is valuable. Sometimes you should skip planning and let Claude figure it out because the task is exploratory. Sometimes a vague prompt is exactly right because you want to see how Claude interprets the problem before constraining it.\n\nPay attention to what works. When Claude produces great output, notice what you did: the prompt structure, the context you provided, the mode you were in. When Claude struggles, ask why. Was the context too noisy? The prompt too vague? The task too big for one pass?\n\nOver time, you'll develop intuition that no guide can capture. You'll know when to be specific and when to be open-ended, when to plan and when to explore, when to clear context and when to let it accumulate.\n\n## Related resources\n\n\n \n Understand the agentic loop, tools, and context management\n \n\n \n Choose between skills, hooks, MCP, subagents, and plugins\n \n\n \n Step-by-step recipes for debugging, testing, PRs, and more\n \n\n \n Store project conventions and persistent context\n \n\n"}]},"uuid":"b26a7fb2-817c-4afc-b8a6-0a7ba1eff551","timestamp":"2026-02-23T18:22:38.405Z","sourceToolAssistantUUID":"002f4263-4f27-4189-9a42-ab9634178198"}