Evaluation record · mcp-server-calendar

MCP Google Calendar Server

v1.0.0

Community

MCPcalendarschedulingmcpmodel-context-protocol

Strong

About This MCP

Community-maintained MCP server for Google Calendar integration. Enables AI models to create, read, update, and delete calendar events, manage attendees, set reminders, and query availability. NOTE: Google now offers an official hosted Calendar MCP server (calendarmcp.googleapis.com) via the Workspace Developer Preview Program, announced May 2026; it supersedes community Calendar MCP servers for most new deployments and is the recommended option where available.

Last Evaluated: July 9, 2026

Official Website

Trust Vector Analysis

Dimension Breakdown

🚀Performance & Reliability

event operation reliability

Operation success rate testing

Evidence

Google Calendar API — Highly reliable event CRUD operations

highVerified: 2026-07-09

availability search accuracy

Availability accuracy testing

Evidence

Calendar Freebusy API — Accurate availability and free/busy time calculations

highVerified: 2026-07-09

sync reliability

Sync reliability testing

Evidence

Calendar Sync — Reliable event synchronization with incremental sync support

mediumVerified: 2026-07-09

recurring event handling

Recurrence pattern testing

Evidence

Recurring Events — Accurate handling of recurring events and exceptions

highVerified: 2026-07-09

error recovery

Error handling testing

Evidence

Implementation Review — Handles API errors with retry and conflict resolution

mediumVerified: 2026-07-09

🛡️Security

authentication security

Authentication mechanism review

Evidence

Google OAuth 2.0 — Uses OAuth 2.0 with scoped calendar access

highVerified: 2026-07-09

token exposure risk

Token security analysis

Evidence

MCP Security Model — OAuth tokens stored locally; AI can perform calendar operations

highVerified: 2026-07-09

event modification risk

Operation authorization testing

Evidence

Security Analysis — AI can create, modify, and delete calendar events

highVerified: 2026-07-09

attendee invitation risk

Invitation risk assessment

Evidence

Calendar Events API — Can send meeting invitations to arbitrary attendees

highVerified: 2026-07-09

calendar sharing control

ACL enforcement testing

Evidence

Calendar ACL — Respects calendar sharing permissions

mediumVerified: 2026-07-09

audit logging

Audit logging review

Evidence

Google Workspace Audit — Calendar operations logged in Google Workspace audit logs

mediumVerified: 2026-07-09

🔒Privacy & Compliance

event details exposure

Data flow analysis

Evidence

MCP Data Flow — Event titles, descriptions, locations, and attendees sent to LLM

highVerified: 2026-07-09

attendee privacy

Attendee privacy assessment

Evidence

Privacy Analysis — Attendee email addresses and names exposed

highVerified: 2026-07-09

schedule pattern exposure

Pattern privacy assessment

Evidence

Privacy Analysis — Calendar patterns may reveal personal routines and habits

mediumVerified: 2026-07-09

third party data sharing

Data sharing analysis

Evidence

LLM Provider Policies — Calendar data shared with LLM provider per their privacy policy

highVerified: 2026-07-09

location privacy

Location privacy assessment

Evidence

Calendar Events — Event locations and conference links may be exposed

mediumVerified: 2026-07-09

👁️Trust & Transparency

documentation quality

Documentation completeness review

Evidence

Calendar MCP Docs — Good documentation but community-maintained

mediumVerified: 2026-07-09

operation visibility

Logging and traceability assessment

Evidence

MCP Protocol — All calendar operations logged in MCP transaction logs

highVerified: 2026-07-09

open source transparency

Source code review

Evidence

GitHub Repository — Open source community implementation

highVerified: 2026-07-09

privacy risk disclosure

Privacy disclosure review

Evidence

Security Documentation — Limited privacy risk warnings for calendar data

mediumVerified: 2026-07-09

⚙️Operational Excellence

ease of setup

Setup complexity assessment

Evidence

Setup Documentation — Requires Google Cloud project setup and OAuth consent

mediumVerified: 2026-07-09

api performance

Performance benchmarking

Evidence

Calendar API Performance — Fast operations for most calendar queries (typically 50-300ms)

highVerified: 2026-07-09

reliability

Reliability analysis

Evidence

Google Calendar API Stability — Built on reliable Google Calendar API with high uptime

highVerified: 2026-07-09

operation coverage

Feature coverage assessment

Evidence

Calendar MCP Server — Covers events, availability, reminders, and attendee management

highVerified: 2026-07-09

community support

Community support assessment

Evidence

GitHub Community — Community-maintained with moderate activity

Google Workspace MCP servers documentation — Google launched an official Calendar MCP server (https://calendarmcp.googleapis.com/mcp/v1) with OAuth 2.0 in the Workspace Developer Preview Program (announced May 2026); community Calendar MCP servers are superseded for most uses

mediumVerified: 2026-07-09

Strengths

+Comprehensive calendar operations (events, availability, reminders)
+Built on reliable Google Calendar API with high uptime
+Accurate availability and free/busy time calculations
+OAuth 2.0 authentication with granular scope controls
+Open source community implementation
+Excellent for scheduling automation and meeting coordination

Limitations

!Event details including titles, locations, and attendees exposed to LLM
!AI can create, modify, and delete calendar events
!Can send meeting invitations to arbitrary attendees
!Calendar patterns may reveal personal routines and habits
!Requires Google Cloud project and OAuth configuration
!Attendee email addresses and names exposed
!Community implementations vary in quality and maintenance; Google's official Calendar MCP server (Workspace Developer Preview, May 2026) is the recommended option going forward

Metadata

license: MIT

supported platforms

0: All platforms with Node.js/Python

programming languages

0: TypeScript

1: Python

mcp version: 1.0

github repo: https://github.com/modelcontextprotocol/servers

api dependency: Google Calendar API, Google APIs Client Library

authentication: OAuth 2.0 with Google

first release: 2024-11

maintained by: Community

official alternative: Google official Calendar MCP server (https://calendarmcp.googleapis.com/mcp/v1, Workspace Developer Preview Program, announced May 2026)

Use Case Ratings

code generation

Useful for calendar integration code generation

customer support

Excellent for appointment scheduling and meeting coordination

content creation

Useful for content calendar management and publication scheduling

data analysis

Good for analyzing meeting patterns and time utilization

research assistant

Useful for research event tracking and deadline management

legal compliance

Risk of exposing confidential meeting details

healthcare

Moderate risk for patient appointment scheduling

financial analysis

Moderate risk for financial meeting scheduling

education

Excellent for class scheduling and academic calendar management

creative writing

Useful for deadline and writing session scheduling