mcp-doctor: one open-source tool for the whole life of an MCP server

A developer released mcp-doctor, an open-source toolkit for checking MCP servers: a linter for Python, TypeScript and Go sources, PR and pre-commit checks, and a live guard inside the running agent. It found 15,755 of 15,977 tools across 805 real servers, and its fixes were merged in 46 outside repos.

• Linter grades quality and security separately, supports Python, TypeScript and Go
• guard catches false "success" writes and prompt-injection leaks in stdio servers
• Found 15,755 of 15,977 tools across 805 servers on 5 frameworks
• 48 fixes merged in 46 outside repos, including langflow and ha-mcp