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Architecture Overview

Transport Layer

  • stdio (default): Direct process communication for Claude Desktop
  • HTTP: RESTful API with SSE for remote deployment

Authentication System

OAuth 2.0 with refresh tokens, multi-account support, secure storage in ~/.config/google-calendar-mcp/tokens.json.

Handler Architecture

  • src/handlers/core/ - Individual tool handlers extending BaseToolHandler
  • src/tools/registry.ts - Auto-registration system discovers and registers handlers
  • src/schemas/ - Input validation and type definitions

Request Flow

Client → Transport → Schema Validation → Handler → Google API → Response

MCP Tools

The server provides calendar management tools that LLMs can use for calendar operations:

Available Tools

  • list-calendars - List all available calendars
  • list-events - List events with date filtering
  • search-events - Search events by text query
  • create-event - Create new calendar events
  • update-event - Update existing events
  • delete-event - Delete events
  • get-freebusy - Check availability across calendars
  • list-colors - List available event colors
  • get-current-time - Get current system time and timezone information

Key Features

  • Auto-registration: Handlers automatically discovered
  • Multi-account: Normal/test account support
  • Rate limiting: Respects Google Calendar quotas
  • Batch operations: Efficient multi-calendar queries
  • Recurring events: Advanced modification scopes
  • Contextual resources: Real-time date/time information