Developer and owner of ChangeProof — a focused tool for reviewing compatibility changes in MCP tool definitions and OpenAPI contracts.

I build tools that help developers see what changed, identify potential breaking changes, and make integration decisions using inspectable evidence.

Website · Explore the project · Request a free compatibility pilot

• MCP: changes to tools/list, required inputs, schemas, types, enums, and metadata.
• OpenAPI: changes to paths, operations, request/response schemas, and referenced models.
• Evidence: structured findings, input hashes, and explicit uncertainty and validation limits.

• UniFi OpenAPI case study — static review of supplied versioned specifications, with findings, hashes, and validation limits.
• Sample compatibility report — a clearly labelled synthetic MCP and OpenAPI example.

• Apache ShenYu — MCP contract evolution regression fixtures (PR #8309) — submitted synthetic MCP tools/list snapshots, directional compatibility expectations, and focused JUnit regression tests for issue #7935. The selected Maven test run passed 5 tests, 0 failures. Status: open for review, not merged (November 2026); this is not an endorsement by Apache ShenYu or validation of runtime pinning.

Current stage: owner-supervised pilot. Reports are reviewed manually; static schema comparisons do not prove runtime behavior. A public unattended analysis API and production automated payments are not available.

Have two public or sanitized versions of an MCP or OpenAPI definition you want compared? Submit a focused free-pilot request.

No production access, private credentials, or payment information is needed for a free pilot. Please do not share secrets in public GitHub issues.