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.

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

Supported Services & Tools

Personal Account Tools (Available by default)

Email (Outlook)
list-mail-messages, list-mail-folders, list-mail-folder-messages, get-mail-message, send-mail, delete-mail-message, create-draft-email, move-mail-message

Calendar
list-calendars, list-calendar-events, get-calendar-event, get-calendar-view, create-calendar-event, update-calendar-event, delete-calendar-event

OneDrive Files
list-drives, get-drive-root-item, list-folder-files, download-onedrive-file-content, upload-file-content, upload-new-file, delete-onedrive-file

Excel Operations
list-excel-worksheets, get-excel-range, create-excel-chart, format-excel-range, sort-excel-range

OneNote
list-onenote-notebooks, list-onenote-notebook-sections, list-onenote-section-pages, get-onenote-page-content, create-onenote-page

To Do Tasks
list-todo-task-lists, list-todo-tasks, get-todo-task, create-todo-task, update-todo-task, delete-todo-task

Planner
list-planner-tasks, get-planner-plan, list-plan-tasks, get-planner-task, create-planner-task

Contacts
list-outlook-contacts, get-outlook-contact, create-outlook-contact, update-outlook-contact, delete-outlook-contact

User Profile
get-current-user

Search
search-query

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

Teams & Chats
list-chats, get-chat, list-chat-messages, get-chat-message, send-chat-message, list-chat-message-replies, reply-to-chat-message, list-joined-teams, get-team, list-team-channels, get-team-channel, list-channel-messages, get-channel-message, send-channel-message, list-team-members

SharePoint Sites
search-sharepoint-sites, get-sharepoint-site, get-sharepoint-site-by-path, list-sharepoint-site-drives, get-sharepoint-site-drive-by-id, list-sharepoint-site-items, get-sharepoint-site-item, list-sharepoint-site-lists, get-sharepoint-site-list, list-sharepoint-site-list-items, get-sharepoint-site-list-item, get-sharepoint-sites-delta

Organization/Work Mode

To access work/school features (Teams, SharePoint, etc.), enable organization mode using any of these flags:

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

Organization mode must be enabled from the start to access work account features. Without this flag, only personal account features (email, calendar, OneDrive, etc.) are available.

Quick Start Example

Test login in Claude Desktop:

Examples

Integration

Claude Desktop

To add this MCP server to Claude Desktop:

Edit the config file under Settings > Developer:

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

Claude Code CLI

claude mcp add ms365 -- npx -y @softeria/ms-365-mcp-server

For other interfaces that support MCPs, please refer to their respective documentation for the correct integration method.

Authentication

⚠️ You must authenticate before using tools.

The server supports three authentication methods:

1. Device Code Flow (Default)

For interactive authentication via device code:

MCP client login:
- Call the login tool (auto-checks existing token)
- If needed, get URL+code, visit in browser
- Use verify-login tool to confirm
CLI login:
```
npx @softeria/ms-365-mcp-server --login
```
Follow the URL and code prompt in the terminal.

Tokens are cached securely in your OS credential store (fallback to file).

2. OAuth Authorization Code Flow (HTTP mode only)

When running with --http, the server requires OAuth authentication:

npx @softeria/ms-365-mcp-server --http 3000

This mode:

Advertises OAuth capabilities to MCP clients
Provides OAuth endpoints at /auth/* (authorize, token, metadata)
Requires Authorization: Bearer for all MCP requests
Validates tokens with Microsoft Graph API
Disables login/logout tools by default (use --enable-auth-tools to enable them)

MCP clients will automatically handle the OAuth flow when they see the advertised capabilities.

Setting up Azure AD for OAuth Testing

To use OAuth mode with custom Azure credentials (recommended for production), you'll need to set up an Azure AD app registration:

Create Azure AD App Registration:

Go to Azure Portal
Navigate to Azure Active Directory → App registrations → New registration
Set name: "MS365 MCP Server"

Configure Redirect URIs: Add these redirect URIs for testing with MCP Inspector (npm run inspector):

http://localhost:6274/oauth/callback
http://localhost:6274/oauth/callback/debug
http://localhost:3000/callback (optional, for server callback)

Get Credentials:

Copy the Application (client) ID from Overview page
Go to Certificates & secrets → New client secret → Copy the secret value

Configure Environment Variables: Create a .env file in your project root:

MS365_MCP_CLIENT_ID=your-azure-ad-app-client-id-here
MS365_MCP_CLIENT_SECRET=your-azure-ad-app-client-secret-here
MS365_MCP_TENANT_ID=common

With these configured, the server will use your custom Azure app instead of the built-in one.

3. Bring Your Own Token (BYOT)

If you are running ms-365-mcp-server as part of a larger system that manages Microsoft OAuth tokens externally, you can provide an access token directly to this MCP server:

MS365_MCP_OAUTH_TOKEN=your_oauth_token npx @softeria/ms-365-mcp-server

This method:

Bypasses the interactive authentication flows
Use your pre-existing OAuth token for Microsoft Graph API requests
Does not handle token refresh (token lifecycle management is your responsibility)

Note: HTTP mode requires authentication. For unauthenticated testing, use stdio mode with device code flow.

Authentication Tools: In HTTP mode, login/logout tools are disabled by default since OAuth handles authentication. Use --enable-auth-tools if you need them available.

CLI Options

The following options can be used when running ms-365-mcp-server directly from the command line:

--login           Login using device code flow
--logout          Log out and clear saved credentials
--verify-login    Verify login without starting the server
--org-mode        Enable organization/work mode from start (includes Teams, SharePoint, etc.)
--work-mode       Alias for --org-mode
--force-work-scopes Backwards compatibility alias for --org-mode (deprecated)

Server Options

When running as an MCP server, the following options can be used:

-v                Enable verbose logging
--read-only       Start server in read-only mode, disabling write operations
--http [port]     Use Streamable HTTP transport instead of stdio (optionally specify port, default: 3000)
                  Starts Express.js server with MCP endpoint at /mcp
--enable-auth-tools Enable login/logout tools when using HTTP mode (disabled by default in HTTP mode)
--enabled-tools  Filter tools using regex pattern (e.g., "excel|contact" to enable Excel and Contact tools)

Environment variables:

READ_ONLY=true|1: Alternative to --read-only flag
ENABLED_TOOLS: Filter tools using a regex pattern (alternative to --enabled-tools flag)
MS365_MCP_ORG_MODE=true|1: Enable organization/work mode (alternative to --org-mode flag)
MS365_MCP_FORCE_WORK_SCOPES=true|1: Backwards compatibility for MS365_MCP_ORG_MODE
LOG_LEVEL: Set logging level (default: 'info')
SILENT=true|1: Disable console output
MS365_MCP_CLIENT_ID: Custom Azure app client ID (defaults to built-in app)
MS365_MCP_TENANT_ID: Custom tenant ID (defaults to 'common' for multi-tenant)
MS365_MCP_OAUTH_TOKEN: Pre-existing OAuth token for Microsoft Graph API (BYOT method)

Contributing

We welcome contributions! Before submitting a pull request, please ensure your changes meet our quality standards.

Run the verification script to check all code quality requirements:

npm run verify

Support

If you're having problems or need help:

Create an issue
Start a discussion
Email: [email protected]
Discord: https://discord.gg/WvGVNScrAZ or @eirikb

Microsoft 365 Integration Server