Ms 365 MCP Server

What is Ms 365 MCP Server about?

Ms 365 MCP Server provides a Model Context Protocol (MCP) endpoint that exposes Microsoft 365 functionalities as callable tools. It translates MCP tool calls into Microsoft Graph API requests, supporting both personal and organization (work/school) accounts.

How to use Ms 365 MCP Server?

1. Install & launch

   npx -y @softeria/ms-365-mcp-server   # starts in stdio mode
   

   • Add --org-mode (or --work-mode) to enable Teams, SharePoint, and other work‑account tools.
   • Use --http <port> to run an HTTP‑based MCP endpoint (default port 3000).
2. Authenticate
   • Default: device‑code flow via the login tool or --login CLI flag.
   • Optional: OAuth flow when running with --http (requires Azure AD app registration).
   • BYOT: provide MS365_MCP_OAUTH_TOKEN env var.
3. Configure in a client (e.g., Claude Desktop)

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

4. Invoke tools through the MCP client – each tool corresponds to a Graph operation (e.g., list-mail-messages, create-calendar-event, list-teams, upload-file-content).

Key features of Ms 365 MCP Server

• Comprehensive M365 coverage: email, calendar, OneDrive, Excel, OneNote, To‑Do, Planner, contacts, user profile, search, Teams, SharePoint, shared mailboxes, user management.
• Authentication flexibility: device‑code flow, OAuth (HTTP mode), or bring‑your‑own‑token.
• Read‑only mode to restrict write operations.
• Tool filtering via regex (--enabled-tools) for fine‑grained exposure.
• Organization mode flag (--org-mode) to unlock work‑account features.
• Secure token storage using OS credential store with fallback to file.
• Built‑in CLI helpers for login, logout, and verification.

Use cases of Ms 365 MCP Server

• AI assistants that need to read/write Outlook mail, schedule calendar events, or manage files on behalf of a user.
• Automation scripts that batch‑process OneDrive files or generate Excel reports.
• Enterprise bots that interact with Teams channels, post messages, or query SharePoint content.
• Customer‑support tools that fetch user profiles, contacts, or shared mailbox messages.
• Custom integrations where a third‑party service requires delegated Graph access without embedding full OAuth logic.

FAQ from the Ms 365 MCP Server

• Do I need an Azure AD app registration?
  • Not for the default device‑code flow. Only required when using the HTTP mode with OAuth.
• Can I run the server on Windows/macOS/Linux?
  • Yes, any platform that supports Node.js ≥20.
• How do I enable only a subset of tools?
  • Use --enabled-tools "excel|contact" or set the ENABLED_TOOLS environment variable with a regex pattern.
• What if I want a read‑only instance?
  • Start the server with --read-only or set READ_ONLY=true.
• How are tokens stored?
  • Tokens are saved in the OS credential store; if unavailable, they fall back to a hidden file in the user’s home directory.
• Is there a way to log out remotely?
  • In stdio mode use the logout tool; in HTTP mode enable auth tools with --enable-auth-tools to expose it.

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

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

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

Shared Mailboxes
list-shared-mailbox-messages, list-shared-mailbox-folder-messages, get-shared-mailbox-message, send-shared-mailbox-mail

User Management
list-users

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.

Shared Mailbox Access

To access shared mailboxes, you need:

1. Organization mode: Shared mailbox tools require --org-mode flag (work/school accounts only)
2. Delegated permissions: Mail.Read.Shared or Mail.Send.Shared scopes
3. Exchange permissions: The signed-in user must have been granted access to the shared mailbox
4. Usage: Use the shared mailbox's email address as the user-id parameter in the shared mailbox tools

Finding shared mailboxes: Use the list-users tool to discover available users and shared mailboxes in your organization.

Example: list-shared-mailbox-messages with user-id set to shared-mailbox@company.com

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.

Local Development

For local development or testing:

# From the project directory
claude mcp add ms -- npx tsx src/index.ts --org-mode

Or configure Claude Desktop manually:

{
  "mcpServers": {
    "ms365": {
      "command": "node",
      "args": ["/absolute/path/to/ms-365-mcp-server/dist/index.js", "--org-mode"]
    }
  }
}

Note: Run npm run build after code changes to update the dist/ folder.

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 <token> 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:

1. Create Azure AD App Registration:

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

2. Configure Redirect URIs:

• Configure the OAuth callback URI: Go to your app registration and on the left side, go to Authentication.
• Under Platform configurations:
  • Click Add a platform (if you don’t already see one for "Mobile and desktop applications" / "Public client").
  • Choose Mobile and desktop applications or Public client/native (mobile & desktop) (label depends on portal version).

3. Testing with MCP Inspector (npm run inspector):

• Go to your app registration and on the left side, go to Authentication.
• Under Platform configurations:
  • Click Add a platform (if you don’t already see one for "Web").
  • Choose Web.
  • Configure the following redirect URIs
    • http://localhost:6274/oauth/callback
    • http://localhost:6274/oauth/callback/debug
    • http://localhost:3000/callback (optional, for server callback)

4. Get Credentials:

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

5. 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.

Tool Presets

To reduce initial connection overhead, use preset tool categories instead of loading all 90+ tools:

npx @softeria/ms-365-mcp-server --preset mail
npx @softeria/ms-365-mcp-server --list-presets  # See all available presets

Available presets: mail, calendar, files, personal, work, excel, contacts, tasks, onenote, search, users, all

Experimental: --discovery starts with only 2 tools (search-tools, execute-tool) for minimal token usage.

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 <pattern> Filter tools using regex pattern (e.g., "excel|contact" to enable Excel and Contact tools)
--preset <names>  Use preset tool categories (comma-separated). See "Tool Presets" section above
--list-presets    List all available presets and exit
--toon            (experimental) Enable TOON output format for 30-60% token reduction
--discovery       (experimental) Start with search-tools + execute-tool only

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
• MS365_MCP_OUTPUT_FORMAT=toon: Enable TOON output format (alternative to --toon flag)
• 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

For Developers

After cloning the repository, you may need to generate the client code from the Microsoft Graph OpenAPI specification:

npm run generate

Support

If you're having problems or need help:

• Create an issue
• Start a discussion
• Email: eirikb@eirikb.no
• Discord: https://discord.gg/WvGVNScrAZ or @eirikb

License

MIT © 2025 Softeria