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

Brex open-sourced CrabTrap, an HTTP proxy that intercepts every agent request and allows or blocks it against a policy in real time. The page shows a dual path of static rules plus an LLM judge, and logs whether each decision came from rule matching or model judgment; the post does not disclose the model, latency overhead, or error rates.

Why it matters: This lands on HKR-K and HKR-R, with HKR-H from the 'LLM-as-a-judge HTTP proxy' hook. The open-source artifact and execution-layer mechanism are concrete, but the post does not disclose the judge model, latency overhead, or false-positive rate, so it stays in the high 70s.