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A Model Context Protocol (MCP) server for interacting with Microsoft 365 and Office services through the Graph API
| Date | Stars |
|---|---|
| 2026-07-31 | 885 |
| 2026-08-04 | 893 |
| 2026-08-06 | 893 |
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# ms-365-mcp-server
[](https://www.npmjs.com/package/@softeria/ms-365-mcp-server) [](https://github.com/softeria/ms-365-mcp-server/actions/workflows/build.yml) [](https://github.com/softeria/ms-365-mcp-server/blob/main/LICENSE)
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 |
## 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](#tool-presets) and [dynamic discovery](#dynamic-tool-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:
```json
{
"value": [
{
"id": "1",
"displayName": "Alice Johnson",
"mail": "[email protected]",
"jobTitle": "Software Engineer"
}
]
}
```
### (experimental) TOON Format
[Token-Oriented Object Notation](https://github.com/toon-format/toon) for efficient LLM token usage:
```
value[1]{id,displayName,mail,jobTitle}:
"1",Alice Johnson,[email protected],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:
```bash
npx @softeria/ms-365-mcp-server --toon
```
Via Claude Desktop configuration:
```json
{
"mcpServers": {
"ms365": {
"command": "npx",
"args": ["-y", "@softeria/ms-365-mcp-server", "--toon"]
}
}
}
```
Via environment variable:
```bash
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`](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
### 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:
```bash
# 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 prExcerpt of 35,378 characters
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