Unable to establish Plane MCP Integration with Supergrok/xAI Connectors

[jacob-kraniak]

Summary of troubleshooting shown below, generated from chat with my Grok instance.

Sequence of Events

1. Initial Recommendation: User requested setup instructions for Plane MCP alongside existing connectors in Grok. I provided the standard OAuth flow using https://mcp.plane.so/http/mcp via grok.com/connectors → Custom Connector.

2. First Attempt (OAuth):

   • The Plane OAuth consent screen loaded successfully (GitHub SSO session active).
   • You selected the “” workspace and approved read/write permissions.
   • Grok’s Custom Connector popup displayed “Complete authentication in the popup window...” and remained stuck in a hung “Connecting...” state indefinitely.

3. Troubleshooting Steps Applied:

   • Recommended deleting the partial connector, clearing browser cache/cookies, using Incognito mode, and full logout/re-login (including GitHub SSO on Plane).
   • Suggested switching to the PAT (Personal Access Token) method to bypass browser OAuth.

4. Second Attempt (PAT):

   • Used the dedicated endpoint https://mcp.plane.so/http/api-key/mcp.
   • Grok again showed the same hung authentication window.
   • No prompt appeared for entering the API key or headers (Authorization: Bearer ... and X-Workspace-Slug).
   • Behavior identical to the OAuth attempt.

Key Observations

• The Plane OAuth consent screen functions correctly.
• The hang consistently occurs on the Grok side during the post-OAuth or PAT handshake phase.
• GitHub SSO on your Plane account may contribute to redirect/cookie conflicts.
• No error message is displayed beyond the indefinite loading state.
• Other MCP connectors in your Grok account function normally, isolating the issue to Plane integration.

Reference Links for Similar / Related Issues

• Plane MCP Server Official Documentation: https://developers.plane.so/dev-tools/mcp-server
• Plane MCP Server Repository (for bug report): https://github.com/makeplane/plane-mcp-server/issues
• General Grok / xAI Remote MCP Documentation: https://docs.x.ai/developers/tools/remote-mcp
• Common MCP OAuth / Custom Connector Hanging Issues (Claude & others):
  • Custom MCP connector: browser stuck in re-login loop after successful OAuth callback anthropics/claude-code#40102 (browser stuck in re-login loop)
  • [BUG] Custom MCP connector OAuth tokens fail to persist across restart; menu "Connect" silently fails while in-chat auth works anthropics/claude-code#52565 (OAuth tokens fail to persist)
  • General MCP connection troubleshooting: https://openclaw-ai.net/en/troubleshoot/mcp-server-connection

[subhamprasad790-hub]

@jacob-kraniak Thank you for reporting this issue. Based on our initial investigation, it appears that the behavior may be related to the Grok integration rather than Plane itself.

Could you please try reproducing the same workflow using another tool such as Claude or a similar provider and let us know if the issue persists? This would help us narrow down the root cause further.

Additionally, we are preparing a new release soon, and there is a possibility that the upcoming changes may resolve this behaviour as well.