slack-local

Postman CSE toolkit MCP server. Currently provides Slack integration with plans to expand to Atlassian, Salesforce, Looker, and more.

Install

npm install -g slack-local

Or run directly:

npx slack-local

MCP Configuration

Add to your MCP client config (Claude Desktop, Cursor, etc.):

{
  "mcpServers": {
    "slack-local": {
      "command": "npx",
      "args": ["-y", "slack-local"]
    }
  }
}

If using a direct Slack token:

{
  "mcpServers": {
    "slack-local": {
      "command": "npx",
      "args": ["-y", "slack-local"],
      "env": {
        "SLACK_TOKEN": "xoxc-..."
      }
    }
  }
}

Tools

Read

| Tool | Description | |------|-------------| | slack_search_channels | Find channels by name | | slack_search_messages | Search messages by keyword, channel, user, time range | | slack_fetch_thread | Get complete thread replies by timestamp | | slack_fetch_channel_history | Get recent messages from a channel | | slack_search_files | Search files by name, type, channel, user | | slack_fetch_recent_messages | Fetch recent messages across all channels | | slack_search_users | Find users by name, email, title, department | | slack_get_user_profile | Get detailed profile for a user | | slack_list_unreads | List all channels/DMs with unread messages |

Write

| Tool | Description | |------|-------------| | slack_send_message | Send a message to a channel or DM | | slack_schedule_message | Schedule a message for future delivery | | slack_add_reaction | Add an emoji reaction to a message | | slack_remove_reaction | Remove an emoji reaction | | slack_update_message | Edit a message you sent | | slack_delete_message | Delete a message you sent | | slack_upload_file | Upload a text file or code snippet | | slack_pin_message | Pin a message to a channel | | slack_mark_as_read | Mark a conversation as read |

Authentication

Three authentication methods are supported, tried in order:

1. Direct token -- Set SLACK_TOKEN or SLACK_BOT_TOKEN env var
2. Okta auth flow -- Uses local Okta Verify app via auth.okta.rip (no API key needed)
3. WebAuthn worker -- Uses webauthn.kepler.rip (requires WEBAUTHN_API_KEY env var)

See AGENTS.md for full authentication details.

Development

git clone <repo-url>
cd slack-mcp
npm install
npm run build
npm run dev       # Run with tsx (hot reload)
npm run start     # Run compiled version