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Dev.to
7/25/2026
I built vexyo, conformance and regression testing for MCP servers

I built vexyo, conformance and regression testing for MCP servers

Short summary

vexyo is an open-source CI-native testing harness for MCP servers that checks conformance against the MCP spec (2025-11-25) with 16 rules across initialization, discovery, error semantics, and transport. It also records golden sets for regression testing, flagging schema, behavioral, and coverage drift on every commit. Works with any language via stdio or Streamable HTTP transport.

  • •Open-source CI harness for MCP server conformance and regression testing
  • •16 spec rules with exact citations; exits non-zero to gate CI builds
  • •Transport-agnostic: works with Python, TypeScript, Go, PHP servers

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