Google Mail Interface Adapter (GMIA)

This implementation provides a Model Context Protocol (MCP) bridge layer, allowing intelligent agents to perform comprehensive interactions with the Gmail and Google Calendar APIs.

Functional Capabilities

Primary Messaging Module

Message Retrieval & Querying
Inventory of electronic mail items using complex search predicates
Deep fetching of selected messages, retrieving complete payloads
Composition and dispatch of novel correspondence artifacts
Preliminary Message State Handling
Initialization of new draft records
Enumeration of extant drafts
Accessing content stored within draft records
Modification of recipient lists, subjects, and body content in existing drafts
Destruction/Removal of specified draft items
Chronological Resource Management
Cataloging forthcoming scheduled engagements
Acquiring granular specifics for any given appointment slot
Provisioning entirely new calendar entries
Parametric searching and constraint application for events
Native support for differing geographic temporal standards
Compatibility layer for Apple iOS scheduling synchronization

Full utilization of native Gmail search syntax
Filtering mechanism based on mailbox label assignments
Controllable ceiling for returned result sets
Advanced search capabilities for temporal bookings

Authorization & Safeguards

Integration adhering to Google OAuth 2.0 specifications
Secure vault for handling access credentials
Automated management of token renewal procedures
Support for authorizing multiple distinct operational scopes

Initial Deployment Guide

Dependencies Checklist

Runtime Environment: Node.js (Minimum version 14)
Package Manager: npm (Minimum version 6)
Infrastructure: Active GCP account with requisite Gmail and Calendar APIs enabled
Security Tokens: Valid OAuth 2.0 credentials possessing necessary permissions

Setup Procedures

Repository cloning and dependency compilation: bash git clone [repository-url] cd gmail-mcp-server npm install
Environmental variable initialization: ```bash # Duplication of configuration template cp .env.example .env

# Injection of secure parameters: GOOGLE_CLIENT_ID="your_client_id" GOOGLE_CLIENT_SECRET="your_client_secret" REDIRECT_URI="http://localhost:4100/code" GOOGLE_REFRESH_TOKEN="your_refresh_token" ```

Compilation and service initiation: bash npm run build npm start

Engineering & Maintenance

Utility Scripts

npm run dev - Build process initiated with continuous file monitoring
npm run build - Project compilation phase
npm run clean - Eradication of intermediate build artifacts
npm run watch - Monitoring filesystem for necessary recompilation triggers

Structural Overview

gmail-mcp-server/ 
├── src/ 
│   ├── config/         # Initialization routines and parameters
│   ├── services/       # Core application logic modules
│   │   ├── gmail/      # Specific Gmail handling functions
│   │   └── calendar/   # Specific Calendar management functions
│   ├── tools/          # MCP tool definitions
│   │   ├── calendar/   # Temporal booking adapters
│   │   ├── drafts/     # Preliminary messaging handlers
│   │   └── messages/   # Core email transmission adapters
│   ├── types/          # TypeScript interface definitions
│   └── index.ts        # Main execution bootstrap file
├── dist/              # Transpiled output directory
└── tests/             # Unit and integration validation suite (future)

Agent Interaction Signatures

Message Listing Endpoint

listEmails({
  maxResults?: number,    // Default: 10
  query?: string,         // Search predicate string
  labelIds?: string[],    // Filter criteria based on label identifiers
  verbose?: boolean       // Flag for detailed output inclusion
})

Message Retrieval Endpoint

readEmail({
  messageId: string    // Unique identifier for the target message
})

Draft Management Procedures

// Inventory Drafts
listDrafts({
  maxResults?: number,    // Default: 10
  query?: string,         // Search predicate for drafts
  verbose?: boolean       // Request for supplementary data
})

// Fetch Draft Content
readDraft({
  draftId: string        // Identifier for the draft artifact
})

// Initiate New Draft
draftEmail({
  to: string[],
  subject: string,
  body: string,
  cc?: string[],
  bcc?: string[],
  isHtml?: boolean
})

// Modify Existing Draft
updateDraft({
  draftId: string,       // Target draft identifier
  to?: string[],         // Revised primary recipients
  cc?: string[],         // Revised carbon copy recipients
  bcc?: string[],         // Revised blind carbon copy recipients
  subject?: string,      // Revised subject line
  body?: string,         // Revised content payload
  isHtml?: boolean       // Flag indicating HTML formatting
})

// Retire Draft
deleteDraft({
  draftId: string        // Identifier of the draft to be purged
})

Transmission Protocol

sendEmail({
  to: string[],
  subject: string,
  body: string,
  cc?: string[],
  bcc?: string[],
  isHtml?: boolean,
  draftId?: string    // Optional: utilize an existing draft record for sending
})

Chronological Events Interface

// Inventory Engagements
listEvents({
  maxResults?: number,    // Default: 25
  timeMin?: string,       // Start boundary (ISO 8601 format)
  timeMax?: string,       // End boundary (ISO 8601 format)
  query?: string,         // Textual search term
  timeZone?: string      // Locale time standard (Default: Australia/Brisbane)
})

// Retrieve Engagement Specifics
readEvent({
  eventId: string,       // Unique ID of the appointment
  timeZone?: string     // Locale time standard (Default: Australia/Brisbane)
})

// Schedule New Engagement
createEvent({
  summary: string,       // Title of the occurrence
  start: { 
    dateTime: string,    // Start timestamp (ISO 8601)
    timeZone?: string    // Start time zone specification
  },
  end: { 
    dateTime: string,    // End timestamp (ISO 8601)
    timeZone?: string    // End time zone specification
  },
  description?: string,  // Elaboration on the event
  location?: string,     // Physical or virtual placement
  attendees?: Array<{    // List of participants
    email: string,
    displayName?: string,
    optional?: boolean
  }>,
  status?: 'confirmed' | 'tentative' | 'cancelled',
  sendNotifications?: boolean
})

Fault Management

The adapter employs robust error interception mechanisms covering: - Authorization validation failures - API invocation rate limit adherence - Malformed input requests - Transport layer connectivity disruptions - Temporal data consistency anomalies - Event identifier verification - Timezone parameter sanity checks

Collaboration Guidelines

Refer to [CONTRIBUTING.md] for standards and procedures.

Revision History

Consult [CHANGELOG.md] for version progression insights.

Future Development Track

See [Backlog.md] detailing proposed extensions and enhancements.

Licensing

Distributed under the MIT License; refer to [LICENSE] for full terms.

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google-mail-interface-adapter

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