A conformance test harness that validates your MCP server against the spec before you ship it. Run it as a CLI to check JSON-RPC 2.0 compliance, protocol version handshakes, OAuth 2.1 PKCE flows, tool schema validity, and capability advertisement accuracy across stdio and HTTP transports. It covers three spec versions (2024-11-05 through 2025-06-18) and exports both pass/fail reports and breaking-change diffs between releases. You can also run it as an MCP server itself, exposing 12 tools that let Claude validate other servers interactively. Built by StudioMeyer as the foundation layer for their MCP Factory builds, where every server runs through this harness before publishing.
claude mcp add --transport stdio io.studiomeyer-protocol-conformance uvx protocol-conformance