📚 Correct how Claude's custom connectors (Cowork, claude.ai, Claude Desktop, mobile) connect to the MCP server: register the bare https://www.bookingsync.com/mcp URL with no query parameters, leave the OAuth client ID/secret empty, and paste the mcp_… token on the Connect to bookingsync-mcp sign-in page Smily opens — documented in Connecting clients with a screenshot of that page, and in Authentication → Connector sign-in. The pasted token is the credential — there is no separate connector password — so it keeps its own account scoping and expiry, and revoking it stops the connector too, which is why an expired token sends you back through the same page. The ?token=URL parameter is now marked legacy: still accepted, so existing setups keep working, but no longer the way to connect Claude. Troubleshooting covers the sign-in page appearing, a connector asking to reconnect, a rejected token, and Unregistered redirect_uri. (400).
