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Cal MCP server

by AIWerk·io.github.AIWerk/mcp-server-cal·v1.0.6
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Cal.com scheduling MCP server: manage bookings, event types, and availability.

B75/100grade B
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Safety scan
B75/100

full report

Adoption
Growing

0 stars50 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Cal tools (12, 5 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • cal_cancel_bookingwrite action

    Cancel a booking by UID. Required: uid. Optional: cancellationReason.

  • cal_create_bookingwrite action

    Create a new booking. Required: eventTypeId, start (ISO 8601), attendeeName, attendeeEmail, attendeeTimezone. Optional: notes, guests (array of emails), metadata.

  • cal_create_event_typewrite action

    Create a new event type. Required: title, slug, lengthInMinutes. Optional: description, locations, hidden, metadata.

  • cal_delete_event_typewrite action

    Delete an event type by ID. Required: id.

  • cal_get_availability

    Get available time slots for an event type in a date range. Required: eventTypeId, dateFrom (ISO 8601), dateTo (ISO 8601). Optional: timeZone.

  • cal_get_booking

    Get details of a specific booking by its UID. Required: uid.

  • cal_get_event_type

    Get details of a specific event type by ID. Required: id.

  • cal_list_bookings

    List bookings with optional filters. Optional: status (upcoming|recurring|past|cancelled|unconfirmed), eventTypeId, dateFrom (ISO 8601), dateTo (ISO 8601), limit.

  • cal_list_event_types

    List all event types. Optional: teamId, userId to filter by team or user.

  • cal_list_schedules

    List all schedules (working hours and availability rules).

  • cal_reschedule_booking

    Reschedule a booking to a new time. Required: uid, newStart (ISO 8601). Optional: reschedulingReason.

  • cal_update_event_typewrite action

    Update an existing event type. Required: id. Optional fields to update: title, slug, lengthInMinutes, description, locations, hidden, metadata.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • Code scan7 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 47 days ago12/15
  • Maintainer identityregistry namespace matches repository owner6/10
Overall 75/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Cal compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
75/100
higher than 45% of 48,273 servers
Tools
12
the typical server has 7
Tools that change things
42%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
50
more than 43% of 11,915 servers with a package

What its tools let an agent do: 7 read · 5 change

Install Cal in Claude Code, Cursor or VS Code

Runs npx -y @aiwerk/mcp-server-cal on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add mcp-server-cal -- npx -y @aiwerk/mcp-server-cal
Add to Cursor

What the publisher says

From the Cal repository's README, as published. We do not edit it. Read it on GitHub

@aiwerk/mcp-server-cal

Cal.com scheduling MCP server - manage bookings, event types, and availability directly from your AI assistant.

Why this server?

Connect Claude, Cursor, or any MCP-compatible AI to your Cal.com account. Create bookings, check availability, manage event types, and view schedules - all via natural language.

Install

Two ways to run this server — pick the one that fits.

Option 1 — Hosted (zero setup)

No local runtime, no env vars on your machine — secrets are AES-256-GCM encrypted server-side via HashiCorp Vault.

  1. Sign up at aiwerkmcp.com.
  2. Install Cal.com from the catalog and paste your CALAPIKEY.
  3. Point your MCP client (Claude.ai, Cursor, Hermes, …) at your hosted endpoint:
https://bridge.aiwerk.ch/u/<your-user-id>/mcp

with your Bearer token.

All 12 tools, 3 resources, and 3 prompts appear. Install other AIWerk recipes from the same bridge.

Option 2 — Self-hosted (npx)

Run directly — you manage the API key:

CAL_API_KEY=cal_live_your_api_key_here npx @aiwerk/mcp-server-cal

Or wire it into your MCP client config — see Configuration below.

Tools

Resources

Resources are automatically available in the AI's context — no need to ask for them.

Prompts

Ready-made prompt templates for common scheduling tasks.

Configuration

Claude Desktop

Add to ~/Library/Application Support/Claude/claudedesktopconfig.json:

{
  "mcpServers": {
    "cal": {
      "command": "npx",
      "args": ["@aiwerk/mcp-server-cal"],
      "env": {
        "CAL_API_KEY": "cal_live_your_api_key_here"
      }
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project or ~/.cursor/mcp.json globally:

{
  "mcpServers": {
    "cal": {
      "command": "npx",
      "args": ["@aiwerk/mcp-server-cal"],
      "env": {
        "CAL_API_KEY": "cal_live_your_api_key_here"
      }
    }
  }
}

OpenClaw / Universal Recipe

{
  "name": "cal",
  "command": "npx",
  "args": ["@aiwerk/mcp-server-cal"],
  "env": {
    "CAL_API_KEY": "${CAL_API_KEY}"
  }
}

Environment Variables

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Cal: common questions

Is Cal MCP server safe?
Mostly: it is graded B (75/100). Read the Cal safety report
How do I install Cal?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Cal need an API key?
Yes. The registry entry asks for CAL_API_KEY.
Is Cal maintained?
The last commit was 84 days ago (2026-08-10). The latest release is v1.0.6.
How does Cal compare with other MCP servers?
safety score 75/100 (higher than 45% of 48,273 servers); tools 12 (the typical server has 7); tools that change things 42% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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