세뇨르

Conformance, contract, and regression testing toolkit for MCP (Model Context Protocol) servers on the JVM — JUnit 5 extension, snapshot testing, token-budget CI gates

Bidirectional contract testing for FastMCP servers: catch schemas that promise less than the implementation demands, and implementations that enforce less than the schema promises.

Lint MCP tool schemas against per-client compatibility rules — catch 'this tool silently fails on Gemini/Claude clients' before shipping. Every rule cites the upstream issue and the exact error string.