# How AI hosts sign in to MCP servers

- [ChatGPT](https://backwatch.dev/hosts/chatgpt.md): callback `https://chatgpt.com/connector_platform_oauth_redirect`
- [Claude](https://backwatch.dev/hosts/claude.md): callback `https://claude.ai/api/mcp/auth_callback`
- [Cursor](https://backwatch.dev/hosts/cursor.md): callback `cursor://anysphere.cursor-mcp/oauth/callback`
- [Codex and Claude Code](https://backwatch.dev/hosts/codex-and-claude-code.md): callback `http://127.0.0.1:33418/callback`
- [Gemini CLI](https://backwatch.dev/hosts/gemini-cli.md): callback `http://localhost:51121/oauth/callback`