Is io.github.AIWerk/mcp-server-cal safe to use?

io.github.AIWerk/mcp-server-cal has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install io.github.AIWerk/mcp-server-cal?

io.github.AIWerk/mcp-server-cal supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What AI clients work with io.github.AIWerk/mcp-server-cal?

io.github.AIWerk/mcp-server-cal is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.

Is io.github.AIWerk/mcp-server-cal actively maintained?

io.github.AIWerk/mcp-server-cal is actively maintained — last commit was 9 days ago.

io.github.AIWerk/mcp-server-cal

@aiwerk/mcp-server-cal

Cal.com scheduling MCP server: manage bookings, event types, and availability.

230/wk GitHub npm

No known CVEs

No license

Actively maintained

Last commit 9d ago

Works with most clients

Transport: stdio, http

0 tools

Grade F

Edit this pageView history

Productivity

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

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

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-aiwerk-mcp-server-cal)](https://mcppedia.org/s/io-github-aiwerk-mcp-server-cal)

Read me

What io.github.AIWerk/mcp-server-cal does

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

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@aiwerk/mcp-server-cal' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

56/100across 5 weighted dimensions

How we score →

0255075100

−44

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @aiwerk/mcp-server-cal against OSV.dev.

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.AIWerk/mcp-server-cal safe to use?: io.github.AIWerk/mcp-server-cal has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.AIWerk/mcp-server-cal?: io.github.AIWerk/mcp-server-cal supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with io.github.AIWerk/mcp-server-cal?: io.github.AIWerk/mcp-server-cal is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.
Is io.github.AIWerk/mcp-server-cal actively maintained?: io.github.AIWerk/mcp-server-cal is actively maintained — last commit was 9 days ago.

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Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Productivity

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

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

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-aiwerk-mcp-server-cal)](https://mcppedia.org/s/io-github-aiwerk-mcp-server-cal)

Read me

What io.github.AIWerk/mcp-server-cal does

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

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@aiwerk/mcp-server-cal' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

README

@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.

Sign up at aiwerkmcp.com.
Install Cal.com from the catalog and paste your CAL_API_KEY.
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

Tool	Description
`cal_list_bookings`	List bookings with optional filters (status, event type, date range)
`cal_get_booking`	Get details of a specific booking by UID
`cal_create_booking`	Create a new booking (event type, attendee info, time)
`cal_cancel_booking`	Cancel a booking by UID
`cal_reschedule_booking`	Reschedule a booking to a new time
`cal_list_event_types`	List all event types
`cal_get_event_type`	Get event type details by ID
`cal_create_event_type`	Create a new event type
`cal_update_event_type`	Update an existing event type
`cal_delete_event_type`	Delete an event type
`cal_get_availability`	Check available slots for an event type in a date range
`cal_list_schedules`	List all schedules (working hours / availability rules)

Resources

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

Resource	URI	Description
Upcoming Bookings	`cal://bookings/upcoming`	Today's and tomorrow's bookings
Event Types	`cal://event-types`	All configured event types
Schedules	`cal://schedules`	Working hours and availability rules

Prompts

Ready-made prompt templates for common scheduling tasks.

Prompt	Description
`daily-schedule`	Summarize today's schedule with bookings and free slots
`find-free-slot`	Find next available time for a specific event type
`reschedule-suggestion`	Suggest alternative times for rescheduling a booking

Configuration

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.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

| Variable | Required | Default | Desc

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

56/100across 5 weighted dimensions

How we score →

0255075100

−44

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @aiwerk/mcp-server-cal against OSV.dev.

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.AIWerk/mcp-server-cal safe to use?: io.github.AIWerk/mcp-server-cal has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.AIWerk/mcp-server-cal?: io.github.AIWerk/mcp-server-cal supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with io.github.AIWerk/mcp-server-cal?: io.github.AIWerk/mcp-server-cal is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.
Is io.github.AIWerk/mcp-server-cal actively maintained?: io.github.AIWerk/mcp-server-cal is actively maintained — last commit was 9 days ago.