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Connect ModusBrain to Claude Cowork

Two ways to get ModusBrain into Cowork sessions:

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Option 1: Remote (via self-hosted server + tunnel)

For Team/Enterprise plans, an org Owner adds the connector:
  1. Go to Organization Settings > Connectors
  2. Add a new connector with the MCP server URL:
  3. Add Bearer token authentication in Advanced Settings (create one with modusbrain auth create "cowork")
  4. Save
Note: Cowork connects from Anthropic’s cloud, not your device. Your server must be publicly reachable (ngrok, Tailscale Funnel, or cloud-hosted).

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Option 2: Local Bridge (via Claude Desktop)

If you already have ModusBrain configured in Claude Desktop (via modusbrain serve stdio or a remote integration), Cowork gets access automatically. Claude Desktop bridges local MCP servers into Cowork via its SDK layer. This means: if modusbrain serve is running and configured in Claude Desktop, you don’t need a separate server for Cowork.

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Which to use?

  • Remote server: works even when your laptop is closed, available to all org members
  • Local Bridge: zero extra setup if Claude Desktop already has ModusBrain, but requires your machine to be running