claude-code - 💡(How to fix) Fix Slack MCP OAuth server silently drops from available MCPs when token expires [4 comments, 3 participants]

The Slack MCP server silently drops off the available MCP list. No error is shown, no re-auth prompt appears — the Slack tools just stop being listed. Logging out and back in resolves the issue until the token expires again.

TL;DR

The Slack MCP server disappearance issue may be resolved by modifying the OAuth token refresh mechanism in the slack@claude-plugins-official plugin to handle token expiration more robustly.

Guidance

• Investigate the token refresh logic in the slack@claude-plugins-official plugin to ensure it correctly handles token expiration and triggers re-authentication when necessary.
• Verify that the OAuth HTTP server at https://mcp.slack.com/mcp is correctly configured and responding as expected.
• Consider adding error handling and logging to the plugin to detect and report token refresh failures.
• Test the issue with other OAuth MCP plugins (e.g., Asana, Atlassian) to determine if the problem is specific to the Slack plugin or a more general issue.

Example

No code snippet is provided due to the lack of specific implementation details in the issue.

Notes

The issue may be related to the OAuth token refresh mechanism, but without more information about the plugin's implementation, it's difficult to provide a more specific solution. The problem may also be affected by the Claude Code version, as the issue is not yet confirmed to be resolved in version 2.1.109.

Recommendation

Apply a workaround by modifying the slack@claude-plugins-official plugin to handle token expiration more robustly, as the root cause of the issue is likely related to the token refresh mechanism.