CrabTrap: An LLM-as-a-judge HTTP proxy to secure agents in production

Forensic Summary

Brex has open-sourced CrabTrap, an HTTP proxy that uses an LLM-as-a-judge architecture to intercept, evaluate, and block or allow requests made by AI agents in real time against configurable policies. The tool targets a critical gap in agentic AI deployments — the lack of runtime guardrails for autonomous agent actions — and represents a practical defensive control against excessive agency and prompt injection exploitation. Its production-oriented design positions it as a notable contribution to the emerging agentic AI security toolchain.

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Read the full technical deep-dive on Grid the Grey: https://gridthegrey.com/posts/crabtrap-an-llm-as-a-judge-http-proxy-to-secure-agents-in-production/