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How to add the Slack MCP server to Claude Code

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).

Claude Code setup

claude mcp add --transport http slack https://mcp.slack.com/mcp \
  --client-id YOUR_CLIENT_ID --client-secret
# then run /mcp inside Claude Code and choose Authenticate

1. Run the command, then run claude mcp get slack to confirm it connected.

We ran the hands-on test in a reference client, not in Claude Code. This config follows Claude Code'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 Cursor
• Slack MCP in VS Code
• Slack MCP in ChatGPT

Full Slack test report | Compare all tested connectors | Connector Weather