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CalendarMCP MCP server

ai.calendarmcp · Updated

Hosted Google Calendar MCP server for AI agents. No self-hosting or Google Cloud setup.

At a glance

CalendarMCP is an MCP server in the Productivity category. It is hosted remotely and connects over HTTP, and needs Authorization. It exposes 10 tools, including list_events, get_event and create_event. It scores B (71/100) on the MCP Skills Hub health score as of Oct 28, 2026.

Source 0GitHub stars

One-click install

Opens your editor and pre-fills the config. Your editor will ask before adding it.

How to install CalendarMCP in your AI client

Setup for Claude Code, Claude Desktop, Cursor, Codex, Windsurf, Cline and VS Code — copy-paste ready.

How to install CalendarMCP in Claude CodeAnthropic's agentic CLI

  1. Add the server

    bash
    claude mcp add --transport http calendarmcp https://calendarmcp.ai/api/mcp --header 'Authorization: Bearer <YOUR_TOKEN>'
  2. Fill in your credentials

    Replace Bearer <YOUR_TOKEN> with your real value. Keep secrets out of any config file you commit.

  3. Verify it's connected

    bash
    claude mcp list
  4. Sharing it with your team?

    Add `--scope project` to write it to .mcp.json in the repository root, which you can commit (with the secrets left as environment variables).

  5. Use it in a session

    Ask Claude to use the tools this server exposes (e.g. list_events, get_event, create_event). It discovers them automatically.

What does CalendarMCP need from you?

Bearer token — Bearer token. Get yours at https://calendarmcp.ai/dashboard

  • AuthorizationrequiredsecretHTTP header

    Bearer token. Get yours at https://calendarmcp.ai/dashboard

What tools does CalendarMCP expose? (10)

Taken from the project's README — the server itself was not queried, so check its docs for the exact schemas.

  • list_eventsList events across one or all connected calendars in a time range. Auto-paginates up to 2500 results.
  • get_eventFull details of one event.
  • create_eventCreate an event. Supports attendees, location, reminders, recurrence, all-day.
  • update_eventPartial update of an existing event.
  • delete_eventDelete an event.
  • quick_add_eventCreate from natural language ("Lunch with Sam Friday 1pm").
  • list_calendarsList every calendar the API key can see, with per-calendar R/W permissions.
  • find_free_timeFree/busy query across one or more calendars. The right thing to call before `create_event` to prevent double-booking.
  • manage_attendeesAdd or remove attendees from an event.
  • batch_update_eventsUpdate up to 50 events in one concurrent call.

What the code can do

This is a remote server — nothing is installed or run on your machine, so there is no local code to analyze. What it can reach is described above: your requests go to the provider's host.

Before you install

Signals gathered from the source repo and package registry — not a safety verdict.

What it can reach

  • Third-party hosted service — Your requests and any data in them are sent to calendarmcp.ai.
  • No local execution — Nothing is installed or run on your machine.
  • Last commit 4 months ago — Actively maintained.
  • 0 GitHub stars — Very little community usage so far.

Client compatibility

Claude Code: NativeClaude Desktop: Via mcp-remoteCursor: NativeCodex CLI: Via mcp-remoteWindsurf: NativeCline: NativeVS Code: Native

Health score

B · 71

Maintenance, adoption, transparency and packaging — not a safety audit. How this is calculated

  • Maintenance30%84%

    Last commit 143 days ago.

  • Adoption20%0%

    0 stars.

  • Transparency20%100%

    4/4: ✓ public source repo, ✓ declared license, ✓ documentation, ✓ discoverable tool list.

  • Provenance15%75%

    Links to its own repository; package linkage unverified.

  • Packaging15%100%

    Remote endpoint with documented authentication.

Documentation

Full README

CalendarMCP

The hosted Google Calendar MCP server. Connect any AI agent to your Google Calendar in about two minutes. No self-hosting, no Docker, no credentials.json.

What this is

CalendarMCP is a hosted Model Context Protocol (MCP) server for Google Calendar. Connect your Google account once, get an API key, and any MCP-compatible client (Claude Desktop, Claude Code, Claude.ai, Cursor, OpenClaw, Continue, Cline, Windsurf, Goose, Zed, ChatGPT custom GPTs, n8n, etc.) can read and write your calendar.

This repo is the public docs, manifest, and client examples for the service. The hosted service is not open source. If you want a self-hosted alternative, the most popular OSS option is nspady/google-calendar-mcp and we recommend it for users who want OAuth tokens to never leave their machine.

What CalendarMCP gives you that self-hosted MCPs do not

  • Zero setup. One Google OAuth click. No credentials.json, no Google Cloud Console, no Docker.
  • HTTP transport. Works with Claude.ai, Claude Code, Cursor, and any hosted MCP client. Self-hosted stdio MCPs only work with Claude Desktop.
  • Batch operations. batch_update_events updates up to 50 events in one concurrent call. Renaming a recurring meeting across a year is one prompt, not 50 clicks.
  • Multi-account, one key. Connect any number of Google accounts (mix OAuth and service-account-shared calendars) under a single API key. Reading fans out across all of them, results merged and sorted.
  • Google Advanced Protection support. The only hosted MCP that works for GAP users (via service-account sharing. OAuth is blocked for those accounts).
  • Per-calendar Read/Write matrix. Tighten what each agent can touch from the dashboard without minting new keys.

Quick start

  1. Visit calendarmcp.ai, sign in with Google, and copy your API key.
  2. Add the MCP server to your client of choice. Configs below.
  3. Talk to your agent: _"What do I have on Tuesday?"_

Client configs

Drop these into the right config file for your MCP client.

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

json
{
  "mcpServers": {
    "calendar": {
      "command": "npx",
      "args": [
        "@modelcontextprotocol/server-fetch",
        "https://calendarmcp.ai/api/mcp"
      ],
      "env": {
        "MCP_AUTH_HEADER": "Authorization: Bearer YOUR_CALENDARMCP_API_KEY"
      }
    }
  }
}

Excerpt — the full document is on GitHub.

Maintain CalendarMCP? Add a badge to your README

Shows its health grade, and links readers to install steps for every client.

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