Container-tier missions held the platform's provider keys in their environment, readable by an agent with Bash and public egress. With CLAWMATES_LLM_PROXY=1 (and CLAWMATES_LLM_PROXY_SECRET), a container instead holds a per-mission token where each key was, ANTHROPIC_BASE_URL points at the server's proxy on :8089 (not published, not routed by Traefik), and the GLM/Kimi hops' base URLs are rewritten in the mission's config copy. The proxy verifies the token (HMAC(secret, mission_id) — stateless, survives redeploys), refuses it unless the mission is running, swaps in the real credential and streams the response. Spiked first on gw-04: Claude Code on a subscription OAuth token, given only a placeholder and a base URL, sent nothing but POST /v1/messages there and answered once the placeholder was swapped. Off by default; no behaviour change until enabled. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>