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How to add the Slack MCP server to ChatGPT

Server URL: https://mcp.slack.com/mcp
Sign-in: OAuth needs your own pre-registered app (no dynamic client registration).
Our hands-on result: Works 7 of 7 tasks passed, tested Oct 16, 2026 with MCP Inspector (reference client).

ChatGPT setup

https://mcp.slack.com/mcp

1. Open Plugins on chatgpt.com, click the plus button, then Add custom MCP server. On some plans you first turn on Developer mode under Settings.
2. Name it slack and enter the URL: https://mcp.slack.com/mcp
3. Choose OAuth and enter your own app client ID and secret if the form offers advanced OAuth settings.
4. Tick the risk acknowledgement, create it, then start a new chat and pick it with @.

We ran the hands-on test in a reference client, not in ChatGPT. This config follows ChatGPT's documented format for remote (Streamable HTTP) servers. If it fails for you, tell us and we will retest.

Known problems and fixes

• MCP error: "Incompatible auth server: does not support dynamic client registration"
• MCP error -32601 Method not found on resources/list
• Slack MCP search fails: needs keywords and natural_language_query

Same server, other clients

• Slack MCP in Claude
• Slack MCP in Claude Code
• Slack MCP in Cursor
• Slack MCP in VS Code

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