agentgateway Jev guardrail example

Watch out

This is an example directory inside someone else's repository, not a maintained product, and it is three files: README.md, config.yaml and guardrail.ts. Running it means exporting both OPENAI_API_KEY and TYPESAFE_API_KEY, starting agentgateway -f config.yaml and then running ./guardrail.ts in a second terminal against a proxy on port 4000, so you need Bun, which installs dependencies automatically and needs --install=force if node_modules already exists, plus AI SDK 7.0.105 or later. Only the last request message and each response choice are inspected, so earlier turns are not re-checked, which matters for a jailbreak spread across a conversation. Evaluation errors block the request rather than failing open, so a Jev outage turns into 403s instead of passthrough. Questions and the threshold are edited by hand in guardrail.ts with no configuration surface, and the capture documents no false-positive rate for any threshold, no calibration data and no cost per request. Copy reviewed against the linked page on 2026-10-04.