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A Soulstack product

Status: Invite onlyDeveloper integration

Hollow MCP

Hollow MCP gives MCP clients one Streamable HTTP endpoint for Hollow tools, authenticated per request with the caller’s own API key and scoped across Notes, Tasks, Calendar, Workbooks, Cascade, and Lumen.

Visit Hollow

Available to invited Hollow accounts.

Developer surface

One endpoint, caller-owned access

  • Streamable HTTPA standard JSON-RPC endpoint for initialize, tool discovery, and tool calls.
  • Per-caller identityEvery request uses the caller’s own Hollow API key and owner context.
  • Hollow toolsSearch, Notes, Tasks, Calendar, Workbooks, Cascade, and Lumen tools in one facade.
  • Scoped permissionsTools require the API-key scope appropriate to the product they reach.

Give your agent a careful way into Hollow

Hollow MCP is available at mcp.projecthollow.com. Configure it from Hollow Developer Keys and keep approval set to ask. Hollow is invite only while we open access in stages.

Visit Hollow

More Hollow apps

Other apps in Hollow

  • A terminal running hollow --help, showing the opening description of the Hollow command line tool and the first commands in its usage list.
    Status: Invite only

    Developer tool

    Hollow CLI

    Programmatic access to Hollow services from scripts, CI, and the terminal.

  • Status: Early access

    VS Code extension

    Hollow Code

    Chat with Hollow and work in your local workspace from inside VS Code.

  • Status: Invite only

    Monitoring app

    Lumen

    Uptime monitors, incidents, and alerts for the services you need to trust.