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Cal.com MCP Integration for LangGraph

Connect Cal.com to LangGraph through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

6 functions 5 read 1 write Bearer token auth
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Connect Cal.com to LangGraph

Run KosmoKrator integration calls from LangGraph nodes while preserving local credentials and permissions.

Use a graph node that calls the KosmoKrator CLI for deterministic steps or an MCP client for dynamic tool selection. The gateway is local, scoped to this integration, and starts with --write=deny so LangGraph can inspect read-capable tools without receiving write access by default.

Cal.com MCP Config for LangGraph

Headless CLI calls fit repeatable graph edges; MCP fits exploratory agent nodes.

{
  "mcpServers": {
    "kosmokrator-cal": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=cal",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=cal --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Cal.com instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Cal.com Tools Visible to LangGraph

LangGraph sees stable MCP tool names generated from the Cal.com integration catalog.

MCP toolSource functionTypeDescription
integration__cal__cal_list_event_types cal.cal_list_event_types Read List available event types (booking link templates) from Cal.com. Supports filtering by team and pagination.
integration__cal__cal_get_event_type cal.cal_get_event_type Read Get detailed information about a specific event type from Cal.com by its ID.
integration__cal__cal_list_bookings cal.cal_list_bookings Read List bookings from Cal.com with optional filtering by status, event type, and pagination.
integration__cal__cal_get_booking cal.cal_get_booking Read Get detailed information about a specific booking from Cal.com by its ID.
integration__cal__cal_create_booking cal.cal_create_booking Write Create a new booking in Cal.com for a specific event type. Provide the event type, start/end times, and attendee information.
integration__cal__cal_get_current_user cal.cal_get_current_user Read Get the authenticated Cal.com user's profile information, including name, email, and time zone.

Related Cal.com Pages

Cal.com CLIUse direct JSON commands instead of MCP discovery. Cal.com MCPFull gateway reference and MCP tool names. KosmoKrator for LangGraphClient-level gateway setup.