📧 Gmail & Calendar MCP Server

Welcome to the Gmail & Calendar MCP Server! This is a Model Completion Protocol (MCP) server designed to interact seamlessly with the Gmail and Google Calendar APIs, empowering Claude to read and manage emails and calendar events from your Google account. 🚀

📜 Summary of Project

The MCP Server is built on Rust, providing a robust and efficient interface to the Google APIs. Through this server, users can perform various functionalities like:

• Listing emails from their inbox 📬
• Searching for emails using Gmail search queries 🔍
• Getting details of specific emails 📑
• Analyzing email content for action items, meetings, contacts, and more 📊
• Batch analyzing multiple emails for quick triage 📋
• Listing all email labels 🏷️
• Checking connection status with the Gmail API 📡
• Listing available calendars 📅
• Retrieving calendar events 🗓️
• Getting details of specific calendar events 🎯
• Creating new calendar events 📝
• Listing contacts from Google Contacts 👤
• Searching for contacts by name, email, or other attributes 🔎
• Getting detailed information about specific contacts 📇

This server enhances Claude's email and calendar management capabilities with specialized prompts for email analysis, summarization, task extraction, meeting detection, contact extraction, prioritization, and more.

⚙️ How to Use

To utilize the Gmail MCP Server, follow these steps:

1. Create a Google Cloud Project and Enable the Gmail API

• Go to the Google Cloud Console
• Create a new project.
• Enable the Gmail API.
• Create OAuth2 credentials (Client ID & Client Secret).
• Configure the OAuth consent screen and add necessary scopes.

2. Get a Refresh Token

To obtain a refresh token:

• Use the OAuth 2.0 authorization flow.
• Request access to the necessary API scopes:
  • For Gmail: https://mail.google.com/
  • For Calendar (read-only): https://www.googleapis.com/auth/calendar.readonly
  • For Calendar (read/write): https://www.googleapis.com/auth/calendar
  • For Contacts: https://www.googleapis.com/auth/contacts.readonly
• You can either:
  • Run the included auth flow using cargo run -- auth which will request all required scopes
  • Utilize the Google OAuth 2.0 Playground for token generation

3. Configure Environment Variables

In the same directory as the executable, create a .env file with:

GMAIL_CLIENT_ID=your-client-id
GMAIL_CLIENT_SECRET=your-client-secret
GMAIL_REFRESH_TOKEN=your-refresh-token

4. Build and Run the MCP Server

To compile and run the server, execute:

cargo build --release
./target/release/mcp-gmailcal

Running in Read-Only Environments (e.g., Claude)

When running in read-only environments like Claude AI, use the --memory-only flag to prevent file system writes:

cargo run -- --memory-only
# or
./target/release/mcp-gmailcal --memory-only

This will use in-memory logging (via stderr) instead of attempting to write log files to disk.

5. Configure Claude to Use the MCP Server

1. Add the MCP server via Claude Code CLI:

   claude mcp add
   

2. Follow prompts to integrate your Gmail MCP server.

🛠 Usage in Claude

You can directly use tools through commands like:

Email Commands

/tool list_emails max_results=5
/tool search_emails query="from:example.com after:2024/01/01" max_results=10
/tool get_email message_id=18c1eab45a2d0123
/tool analyze_email message_id=18c1eab45a2d0123 analysis_type="tasks"
/tool batch_analyze_emails message_ids=["18c1eab45a2d0123", "18c1eab45a2d0456"] analysis_type="summary"
/tool list_labels
/tool check_connection

Calendar Commands

/tool list_calendars
/tool list_events calendar_id="primary" max_results=10 time_min="2024-03-01T00:00:00Z" time_max="2024-04-01T00:00:00Z"
/tool get_event calendar_id="primary" event_id="abc123event456id"
/tool create_event summary="Team Meeting" description="Weekly sync" location="Conference Room A" start_time="2024-04-10T14:00:00Z" end_time="2024-04-10T15:00:00Z" attendees=["person1@example.com", "person2@example.com"]

Contact Commands

/tool list_contacts max_results=10
/tool search_contacts query="John" max_results=5
/tool get_contact resource_name="people/c12345678901234567"

Or through natural language requests:

Email Requests

• "Check my Gmail connection status"
• "Show me my 5 most recent unread emails"
• "Search for emails from example.com sent this year"
• "Get the details of email with ID 18c1eab45a2d0123"
• "Analyze this email for action items and deadlines"
• "Extract meeting details from these emails"
• "Summarize these 3 emails for me"
• "Find all contact information in this email"
• "Help me prioritize these emails"

Calendar Requests

• "Show me all my calendars"
• "List my upcoming events for next week"
• "Show me details for the team meeting on Friday"
• "Create a new meeting titled 'Project Review' for tomorrow at 2pm with team@example.com"
• "What events do I have scheduled between April 1 and April 15?"
• "Schedule a doctor's appointment for next Monday at 10am"

Contact Requests

• "List my contacts"
• "Find contacts named Smith"
• "Search for contacts at example.com"
• "Show me details for contact with ID people/c12345678901234567"
• "Find contact information for John Doe"

📝 Advanced Email Analysis

The Gmail MCP Server provides specialized analysis capabilities through a set of custom prompts that help Claude understand and extract insights from emails:

Analysis Types

• General Email Analysis: Comprehensive analysis of email content, context, tone, and next steps
• Task Extraction: Identifies explicit and implicit action items, deadlines, and responsibilities
• Meeting Detection: Extracts meeting details including date, time, location, participants, and agenda items
• Contact Extraction: Identifies and formats contact information from email content
• Email Summarization: Creates concise summaries of emails based on their length and complexity
• Email Categorization: Classifies emails into categories like Action Required, FYI, Follow-up, etc.
• Email Prioritization: Assesses urgency and importance of emails for better inbox management
• Email Drafting Assistance: Guidelines for writing effective emails for different purposes

Using Analysis Features

• Individual analysis: analyze_email message_id="..." analysis_type="tasks|meetings|contacts|summary|priority|all"
• Batch analysis: batch_analyze_emails message_ids=["id1", "id2", "id3"] analysis_type="summary"

These analysis features help users quickly understand email content, extract important information, and take appropriate actions without having to read through lengthy messages.

🔧 Tech Info

• Language: Rust
• Primary Dependencies:
  • mcp-attr - For MCP server implementation
  • tokio - Asynchronous runtime
  • reqwest - HTTP client for Google APIs
  • serde and serde_json - For JSON serialization
  • dotenv - For environment variable management
  • log, simplelog, and chrono - For logging functionality
  • uuid - For generating unique request IDs
  • chrono - For datetime handling
• Testing: Includes a comprehensive suite of unit and integration tests to ensure reliability and performance.

📅 Calendar Management

The Google Calendar integration provides a set of tools to manage your calendar events through Claude:

Calendar Features

• List Calendars: View all calendars you have access to
• List Events: Get events from any calendar with optional filtering by date range
• Get Event Details: Retrieve complete information about a specific event
• Create Events: Schedule new events with titles, descriptions, times, locations, and attendees

Calendar Permissions

The Calendar API uses the same OAuth credentials as the Gmail API, but requires the following additional scopes:

• https://www.googleapis.com/auth/calendar.readonly (for reading calendars and events)
• https://www.googleapis.com/auth/calendar (for creating and modifying events)

You can modify your OAuth consent screen to include these scopes when setting up your Google Cloud project.

👤 Contact Management

The Google People API integration provides tools to access and search your contacts:

Contact Features

• List Contacts: View all contacts in your Google Contacts with optional limit
• Search Contacts: Find contacts by name, email, organization or other attributes
• Get Contact Details: Retrieve complete information about a specific contact including name, emails, phone numbers, and organizations

Contact Permissions

The People API uses the same OAuth credentials as the Gmail API, but requires the following additional scope:

• https://www.googleapis.com/auth/contacts.readonly (for reading contact information)

This scope gives read-only access to your contacts, allowing the MCP server to retrieve contact information without modifying your contact list.

Project Structure

src/
  ├── lib.rs          # Main implementation including API clients and MCP server
  ├── main.rs         # Command-line interface and server startup
  ├── config.rs       # Configuration handling
  ├── gmail_api.rs    # Gmail API client implementation
  ├── calendar_api.rs # Google Calendar API client implementation
  ├── people_api.rs   # Google People API client implementation (contacts)
  ├── logging.rs      # Logging setup
  ├── server.rs       # MCP server implementation
  └── prompts.rs      # Email analysis prompts
tests/
  └── integration_tests.rs  # Integration tests for MCP commands
.env.example          # Example environment variables
.gitignore            # Git ignore configuration
Cargo.toml            # Rust dependencies
mcp-test.sh           # MCP test script
mise.toml             # Development environment configuration
README.md             # This file
test_mcp_server/      # Test utilities for the MCP server

Note:

Make sure to handle sensitive information with care as some files may contain credentials or tokens. Always refer to the official Gmail API documentation for the latest updates and practices.

Thank you for your interest in the Gmail MCP Server! If you have any questions or feedback, feel free to reach out or contribute to the repository! Happy coding! 🎉

🚀 Release Process

To create a new release:

1. Use the included script to bump the version:

# View current version
./trigger-release.sh version

# Bump patch version (0.1.0 -> 0.1.1)
./trigger-release.sh bump-patch

# Bump minor version (0.1.0 -> 0.2.0)
./trigger-release.sh bump-minor

# Bump major version (0.1.0 -> 1.0.0)
./trigger-release.sh bump-major

# Or set a specific version
./trigger-release.sh set-version 1.2.3

2. Commit the version change:

git add Cargo.toml
git commit -m "Bump version to X.Y.Z"
git push

3. Create and push a new tag to trigger the release workflow:

./trigger-release.sh tag-current

4. The GitHub Actions workflow will automatically:
   • Create a GitHub release
   • Build binaries for Windows, Linux, and macOS (Intel & Apple Silicon)
   • Attach binaries to the release