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DimensionGmail MCP ServerMCP implementation for Gmail servicesMicrosoft 365 MCP ServerAn MCP server for interacting with Microsoft 365 and Office services through the Graph API.
FMRS58 / 100 · C61 / 100 · C
Reliability8 / 208 / 20
Security and permissions12 / 2013 / 20
Maintenance12 / 2010 / 20
Documentation14 / 2016 / 20
Setup experience12 / 2014 / 20
Best for
  • Developers and enterprises needing Gmail integration with AI applications
  • Users who want to control email workflows via natural language
  • MCP client users wanting to leverage Gmail's full capabilities
  • Developers who want to integrate Microsoft 365 data into AI assistants or custom applications.
  • Scenarios requiring unified access across multiple services (email, calendar, files, Teams, etc.).
  • Lightweight solutions to interact with Graph API via MCP protocol.
Not for
  • Users without a Gmail or Google Workspace account
  • Those who require real-time synchronization and push notifications without configuring watch
  • Privacy-sensitive users who do not want telemetry data collected (though it can be disabled)
  • Highly secure enterprise production environments (requires careful scope management and deployment complexity).
  • Admin tasks requiring Microsoft 365 admin permissions (like security alerts, audit logs) — consider companion project ms-365-admin-mcp-server.
  • Environments without Node.js.
  • Support for non-Microsoft clouds like GCC High (only Global and China 21Vianet currently).
Required permissions
  • Requires access to the user's Gmail account for reading, sending, deleting emails, managing labels, settings, etc.
  • Requires OAuth 2.0 authorization to obtain access and refresh tokens
  • Requires Microsoft Graph API permissions, dynamically requested based on enabled tools. Examples: User.Read, Mail.Read, Files.Read.
  • Organization mode (--org-mode) requires additional Graph permissions for Teams, SharePoint, etc. (e.g., Sites.Read.All).
  • Shared mailbox access requires delegated Mail.Read.Shared or Mail.Send.Shared scopes.
  • Use --allowed-scopes to restrict tool exposure; --extra-scopes to add extra scopes. Note: --allowed-scopes only narrows, never expands permissions.
Risks and side effects
  • Email data exposure: the server may read and process email content
  • Irreversible actions: sending or deleting emails cannot be undone
  • Telemetry collection: telemetry is enabled by default, collecting anonymous usage data but no personally identifiable information
  • Token security: File-based token storage may be exposed; use OS credential storage or secure custom paths.
  • Overly broad permissions: default requests all scopes implied by tools; use allowed-scopes or tool filtering to limit.
  • Multi-tenant token risk: With default 'common' tenant, personal account refresh tokens may be rejected as of June 2026, causing session expiry.
  • Third-party project risk: Not officially maintained, potentially less stable than official solutions.
  • HTTP mode OAuth setup complexity: Requires correct Azure AD app registration and redirect URIs.
Supported clientsClaude DesktopClaude Desktop, Open WebUI
Tools6510