The MCP package requires Python 3.10 or higher. Updated: - GitHub Actions workflow to test Python 3.10, 3.11, 3.12 - README.md badge to Python 3.10+ - CLAUDE.md prerequisites - CONTRIBUTING.md prerequisites - docs/MCP_SETUP.md prerequisites This fixes the MCP installation error in CI: 'ERROR: No matching distribution found for mcp>=1.0.0' MCP package versions 0.9.1+ all require Python 3.10+.