ContractWatch snapshots your MCP tool catalog or REST contract on a schedule and diffs it against yesterday. When something breaking slips in, you hear about it in Slack — before your callers file the ticket.
Any client still sending customer_id alone will start receiving 400s.
Point it at your MCP server's tool catalog or an OpenAPI spec. Same deterministic diff engine, same severity rules — no baseline-learning guesswork.
See the exact field, type, or tool signature that changed — not just “something broke.”
Slack, email, or a webhook into your own system. No dashboard you have to remember to check.
2 monitors, daily checks, email alerts — no credit card required. Upgrade when you outgrow it.