Calendar MCP

An MCP server that gives an LLM client read and write access to your Google Calendar. It runs as a single process - stdio by default, streamable HTTP optionally - and exposes 23 tools with structured output: listing and searching calendars and events, creating, updating, moving, RSVPing to and deleting events, free/busy queries, busyness analysis, recurring-event projection, and finding a mutual slot and booking it.…

People who work with event, time and events and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-06 · ★ 26 · #49 OF 160 MAINTAINED PRODUCTIVITY · VERIFIED 2026-09-18

NOASSERTION · Python servers · how we verify → /methodology

01 · Install Calendar MCP

before you install - you'll need

Set GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET before connecting. TOKEN_FILE_PATH is optional or environment-specific per the README.

Claude Code

claude mcp add deciduus-calendar-mcp -- uvx calendar-mcp-server

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "deciduus-calendar-mcp": {
      "command": "uvx",
      "args": [
        "calendar-mcp-server"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license no standard license detected - usage rights unclear; check the repo before commercial use

pypi package calendar-mcp-server - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.deciduus is GitHub-verified and matches the repo owner

03 · What Calendar MCP can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can list the calendars the user can see, with IDs and timezones, search a calendar for events, expanding recurring series into instances, report who accepted, declined or has not answered an invitation, and create a new secondary calendar.

Capability map

Tools grouped from the project's README - what Calendar MCP lets an agent do.

Event

6 tools - e.g. Create an event with explicit start/end times and optional attendees.; Create an event from a plain-English phrase, parsed by Google.; Change fields on an event; omitted fields are left untouched.

create_event · quick_add_event · update_event · move_event · respond_to_event · delete_event

read & search

5 tools - e.g. List the calendars the user can see, with IDs and timezones.; Search a calendar for events, expanding recurring series into instances.; Busy intervals for one or more calendars, without event details.

list_calendars · find_events · query_free_busy · find_focus_time · list_accounts

create & write

2 tools - e.g. Create a new secondary calendar.; Invite one or more people to an existing event.

create_calendar · add_attendee

Preferences

2 tools - e.g. Working hours, lunch, buffer, minimum focus block, focus calendar.; Update and save those preferences. Local file only.

get_preferences · set_preferences

Check

1 tool - e.g. Report who accepted, declined or has not answered an invitation.

check_attendee_status

Analyze

1 tool - e.g. Per-day event count and total scheduled minutes over a range.

analyze_busyness

Project

1 tool - e.g. Compute future occurrences from recurrence rules.

project_recurring_events

Schedule

1 tool - e.g. Find the first slot where everyone is free, then book it.

schedule_mutual

Latest releases

v1.1.0 · 2026-09-06

The "scheduling brain" release. 23 tools. Existing tool names unchanged. · uvx calendar-mcp-server · New · Multi-account: calendar-mcp auth --account work, calendar-mcp accounts; every tool takes an optional account.…

v1.0.1 · 2026-09-05

Adds the MCP Registry ownership marker to the README. No code changes.

v1.0.0 · 2026-09-05

First release on PyPI. Install with one line: · uvx calendar-mcp-server · Highlights · Single-process server on the mcp 2.x SDK. No more internal HTTP server or startup race. · calendar-mcp auth for one-time Google…

04 · Who maintains Calendar MCP

calendar-mcp is maintained by deciduus. It's the only MCP server we track from this author; the repo dates to Apr 2025.

05 · Facts

repository: github.com/deciduus/calendar-mcp
category: productivity - ranked #49 of 160 actively-maintained productivity servers as of 2026-09-18.
release cadence: 3 releases in the last 90 days (latest 2026-09-06)
registry: io.github.deciduus/calendar-mcp (active, first published 2026-09-05)
packages: pypi:calendar-mcp-server

06 · Calendar MCP FAQ

Is Calendar MCP still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-06 and it shipped 3 releases in the last 90 days. We re-verify nightly.

What can Calendar MCP do?

How do I install Calendar MCP?

Run `uvx calendar-mcp-server`. The README documents 3 environment variables (GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET, TOKEN_FILE_PATH) to set first. Set GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET before connecting. TOKEN_FILE_PATH is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does Calendar MCP run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Calendar MCP

Alternatives to Calendar MCP

Maintained productivity servers if Calendar MCP isn't the fit.

Pairs well with

Servers that cover what Calendar MCP doesn't - only shown when the pairing reason fits the companion.

More productivity MCP servers · Jira Scoped · Server Trello · Focus Relay · Airtable · Caldav MCP

More Python MCP servers · Deep Mem · Deepsky Aviation Regulations · Defenter Proxy · Fiscal Brasil (dehor-labs) · Delego · see all