Slack MCP Server — VS Code Extension
VS Code extension that automatically registers the Slack MCP server, making all Slack tools available to AI assistants like GitHub Copilot.
Features
- Auto-registration: Server appears in the MCP Servers panel as soon as the extension is installed
- VS Code Settings: All configuration via VS Code Settings UI (no manual JSON editing)
- Live Reload: Settings changes are picked up immediately without restart
Configuration
Open Settings → search for "Slack MCP":
| Setting |
Description |
slackMcp.botToken |
Bot User OAuth Token (xoxb-...) |
slackMcp.userToken |
User OAuth Token (xoxp-...) |
slackMcp.xoxcToken |
Browser session token (xoxc-...) |
slackMcp.xoxdToken |
Browser cookie d (xoxd-...) |
slackMcp.teamId |
Workspace/Team ID |
slackMcp.channelIds |
Predefined channel IDs |
slackMcp.defaultChannel |
Default channel for messaging |
slackMcp.enabledTools |
Comma-separated tool allow-list |
slackMcp.maxResults |
Max results per query |
slackMcp.timeoutMs |
Request timeout (ms) |
slackMcp.cacheTtl |
Cache TTL |
slackMcp.logLevel |
Log level |
slackMcp.proxy |
Proxy URL |
slackMcp.govSlack |
Use slack-gov.com endpoints |
slackMcp.serverCaInsecure |
Trust insecure TLS |
slackMcp.addMessageTool |
Enable messaging |
slackMcp.reactionTool |
Enable reactions |
slackMcp.canvasTool |
Enable canvas writes |
slackMcp.attachmentTool |
Enable attachment reads |
slackMcp.markTool |
Enable mark-as-read |
Example Prompts
After configuring a token:
- "List all channels in my Slack workspace"
- "Search for messages about the deployment issue"
- "Send a message to #general saying 'Hello from AI!'"
- "Who are the members of the #engineering channel?"
- "What are my unread messages?"
Troubleshooting
Server not appearing in MCP panel
- Ensure VS Code >= 1.99.0
- Check that the extension is enabled
- Open the Output panel → "Slack MCP Server" for errors
Authentication errors
- Verify your token in Settings
- Ensure the token has required OAuth scopes
- Check if the token has expired
License
MIT
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