mcp-doctor

Paste your MCP config (or a tools/list response) and get the exact bug and the exact fix. Runs 100% in your browser — nothing leaves this tab. Also available as a CLI: npx mcp-diagnose

Works with Claude Desktop / Claude Code / Cursor .mcp.json

Free forever. GitHub · npm · MCP Ship-Ready Pack (CLI + hardened templates + CI) — $19
The CLI can do more: mcp-doctor config.json --live actually runs the server and does a real initialize handshake, then reports where it breaks.