Vercel MCP OAuth setup fails with invalid_redirect_uri #770

Summary

Adding the Vercel MCP source at https://mcp.vercel.com fails during OAuth setup. The UI reports that dynamic authorization setup failed because the redirect URI is not approved by the authorization server.

Steps to reproduce

1. Open Add MCP Source.
2. Select or configure mcp.vercel.com with server URL https://mcp.vercel.com.
3. Use OAuth authentication.
4. Try to add/connect the source.

Actual result

The source cannot be added. The UI shows:

Dynamic authorization setup failed: Dynamic Client Registration failed: invalid_redirect_uri — The provided redirect URIs are not approved for use by this authorization server.

The form also shows OAuth required to discover tools.

Expected result

The OAuth flow should complete successfully, or the app should provide a supported redirect URI/setup path for Vercel MCP.

Notes

Observed from the Add MCP Source screen while configuring:

• Display name: Vercel MCP
• Namespace: vercel_mcp
• Server URL: https://mcp.vercel.com
• Auth: OAuth
• Connection saved to: Personal

Screenshot was provided with the report.