Rule Gate is a policy-guarded AI operations agent whose business rules live in deterministic code, not in a prompt: the LLM proposes actions, and code decides whether they execute. It serves teams automating operational workflows who need hard guarantees that an agent cannot step outside policy. The project is built to production patterns — typed boundaries, real error handling, versioned evals, and tracing — with a live Cloudflare Workers demo and a fully offline, zero-API-key reproducible local demo.