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ms-365-mcp-server

Microsoft 365 MCP Server

A Model Context Protocol (MCP) server for interacting with Microsoft 365 and Microsoft Office services through the Graph API.

Supported Clouds

This server supports multiple Microsoft cloud environments:

Cloud	Description	Auth Endpoint	Graph API Endpoint
Global (default)	International Microsoft 365	login.microsoftonline.com	graph.microsoft.com
China (21Vianet)	Microsoft 365 operated by 21Vianet	login.chinacloudapi.cn	microsoftgraph.chinacloudapi.cn
GCC High	Microsoft 365 US Government GCC High	login.microsoftonline.us	graph.microsoft.us

GCC High has no pre-registered client: register an app in your government tenant and set MS365_MCP_CLIENT_ID (and MS365_MCP_TENANT_ID), then use --cloud gcc-high.

To route Graph traffic through a proxy of your own (one that terminates the client's plain HTTP and originates TLS to Microsoft), set MS365_MCP_GRAPH_BASE_URL to its base URL; see the environment variable list under CLI Options, including what still bypasses it.

Prerequisites

• Node.js >= 20 (recommended)
• Node.js 14+ may work with dependency warnings

Features

• Authentication via Microsoft Authentication Library (MSAL)
• Comprehensive Microsoft 365 service integration
• Read-only mode support for safe operations
• Tool filtering for granular access control
• Tool presets and dynamic discovery to shrink the tool surface and token usage

Output Format: JSON vs TOON

The server supports two output formats that can be configured globally:

JSON Format (Default)

Standard JSON output with pretty-printing:

{
  "value": [
    {
      "id": "1",
      "displayName": "Alice Johnson",
      "mail": "alice@example.com",
      "jobTitle": "Software Engineer"
    }
  ]
}

(experimental) TOON Format

Token-Oriented Object Notation for efficient LLM token usage:

value[1]{id,displayName,mail,jobTitle}:
  "1",Alice Johnson,alice@example.com,Software Engineer

Benefits:

• 30-60% fewer tokens vs JSON
• Best for uniform array data (lists of emails, calendar events, files, etc.)
• Ideal for cost-sensitive applications at scale

Usage: (experimental) Enable TOON format globally:

Via CLI flag:

npx @softeria/ms-365-mcp-server --toon

Via Claude Desktop configuration:

{
  "mcpServers": {
    "ms365": {
      "command": "npx",
      "args": ["-y", "@softeria/ms-365-mcp-server", "--toon"]
    }
  }
}

Via environment variable:

MS365_MCP_OUTPUT_FORMAT=toon npx @softeria/ms-365-mcp-server

Supported Services & Tools

The server provides 300+ tools covering most of the Microsoft Graph API surface. Each tool maps 1-to-1 to a Graph API endpoint and is defined declaratively in src/endpoints.json.

Personal Account Tools (Available by default)

Email (Outlook), Calendar, OneDrive Files, Excel, OneNote, To Do Tasks, Planner, Contacts, User Profile, Search

Organization Account Tools (Requires --org-mode flag)

Teams & Chats, Online Meetings, Transcripts & Recordings, Attendance Reports, SharePoint Sites & Lists, Shared Mailboxes & Calendars, User Management, Presence, Virtual Events

Custom Teams emojis are available in organization mode through list-custom-emojis and create-custom-emoji (teams and work presets). These use the Microsoft Graph beta API and request the delegated permissions TeamworkCustomEmoji.Read and TeamworkCustomEmoji.Create, respectively. Read-only mode exposes only the list tool. Existing deployments may need consent for these new scopes and reauthentication; adding tool support does not upgrade an already-issued token.

Listing can return contentBytes: null by default. To request base64 PNG/GIF images, pass select: "displayName,contentBytes" or select: ["displayName", "contentBytes"]. Use a small top to keep image responses manageable. To create an emoji, pass body: { displayName, contentBytes } with the exact approved name and base64 PNG/GIF file bytes. See Microsoft's list and create contracts. These tools do not post messages or reactions.

Required Graph API Permissions

Permissions are requested dynamically based on which tools are enabled. Use --list-permissions to see the exact permissions for your configuration:

# Personal mode (default)
npx @softeria/ms-365-mcp-server --list-permissions

# Organization mode (includes Teams, SharePoint, etc.)
npx @softeria/ms-365-mcp-server --org-mode --list-permissions

# Filtered by preset
npx @softeria/ms-365-mcp-server --preset mail --list-permissions

This is useful for enterprise environments where Graph API permissions must be pre-approved and admin-consented before deploying a new version.

The --list-permissions JSON includes:…