---
id: "AEB-007"
category: "security_architecture"
confidence: 0.96
date: "2026-02-15"
source_file: "Agentic OS Blueprint Research Synthesis (MCP-Guard section, arXiv:2508.10991)"
---

# AEB-007

MCP-Guard employs a 3-stage cascaded defense pipeline for securing agentic tool use: Stage 1 Syntactic Filtering (regex-based, sub-2ms, intercepts overt threats like SQL injection), Stage 2 Semantic Neural Detection (fine-tuned embedding models like Multilingual E5, 96% accuracy on obfuscated payloads), Stage 3 Cognitive Arbitration (high-level LLM judges ambiguous cases) -- each stage acts as a progressively more expensive but more capable filter

## Relationships

