SchemaSentry

SchemaSentry is a web app that continuously detects API contract drift between what your OpenAPI/GraphQL schema says and what your production traffic actually does. It passively observes real requests/responses, flags undocumented endpoints, breaking changes, and risky fields (like PII suddenly appearing), then generates a pull request to update specs or suggests a safe versioning path. It also scores each change by blast radius using call volume and client fingerprints, so teams stop shipping “minor” changes that quietly break mobile apps and partners. This is not a full API gateway or WAF; it’s a focused contract-integrity layer that plugs into existing stacks. Expect some setup friction (traffic mirroring, schema hygiene), but once running it reduces incidents, support tickets, and partner churn—especially for fast-moving teams with multiple services and owners.