Know what changed upstream,
and what it could break.

Watchdog watches the third-party APIs behind your connectors, detects deprecations and breaking changes before they hit you, and tells you exactly what changed and which of your orgs it affects.

Open dashboardFor agents (llms.txt)

How it works

vendor signals (changelog · spec · GraphQL · headers · MCP · email) -> detect + diff -> translate (Workers AI) -> ApiChangeEvent -> classify (breaking / dangerous / additive) -> blast radius (which orgs, ranked by usage) -> feed · webhooks · Slack/email · MCP tool · dashboard

Eight detection tiers, one normalized event

Changelogs
Poller + cdio.fastn.dev, deprecation-gated
OpenAPI / GraphQL
Spec + introspection diffing
Sunset headers
RFC 8594 / 9745, dated countdowns
MCP tools/list
Watches other MCP servers
Endpoint shape-probe
Spec-less, volatile-value safe
Deprecation emails
The channel everyone loses in inboxes

What you get

Stripe removes Charges.source
spec-diff · effective 1 Mar 2027 · P1 · 3 orgs use it daily
breaking
GitHub adds sub_issues field
GraphQL diff · live now
additive