Ms 365 Mcp Server

ms-365-mcp-server

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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

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 200+ 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:

# 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:

• toolPermissions: permissions implied by the tool surface before --allowed-scopes filtering
• effectivePermissions: permissions implied by the tools that remain enabled after --allowed-scopes
• permissions: legacy alias for effectivePermissions, kept for compatibility with existing scripts
• allowedScopes: the configured scope allowlist, when provided
• disabledTools: tools hidden because their required Graph scopes are not covered by allowedScopes
• missingAllowedScopesForTools: unique missing scopes across disabled tools
• extraAllowedScopesNotUsedByTools: allowed scopes that are not used by the current tool surface

Allowed Scopes

By default, MSAL requests the scopes implied by the enabled tools, and the tool surface is controlled by --enabled-tools, --preset, --org-mode, and --read-only.

Enterprise and headless deployments can add a scope boundary with --allowed-scopes or MS365_MCP_ALLOWED_SCOPES. When configured, the server first computes the normal tool surface, then hides Graph tools whose required scopes are not covered by the allowlist. OAuth metadata and login flows request only the effective permissions for the tools that remain enabled.

npx @softeria/ms-365-mcp-server \
  --org-mode \
  --enabled-tools '^(list-mail-messages|get-mail-message|list-drives|get-drive-item|download-bytes)$' \
  --allowed-scopes 'User.Read Mail.Read Files.Read'

CLI value takes precedence over MS365_MCP_ALLOWED_SCOPES; if neither is set, the default tool-derived scope behavior is unchanged. Supplying an empty value fails at startup so deployments do not accidentally fall back to a wider tool surface.

Scope coverage is hierarchy-aware: for example, Mail.ReadWrite covers tools that require Mail.Read, and Files.ReadWrite.All covers tools that require Files.Read.

In HTTP mode, OAuth discovery advertises the effective filtered permissions so clients request the same consent surface. On-Behalf-Of mode (--obo) still advertises api:///access_as_user for protected-resource metadata; --allowed-scopes does not override OBO.

Requesting extra scopes

--allowed-scopes only ever narrows the token request. To request a Graph scope that no bundled tool needs — for example to drive an endpoint via graph-batch — use --extra-scopes (or MS365_MCP_EXTRA_SCOPES). These scopes are appended verbatim to the token request, on top of the tool-derived scopes.

npx @softeria/ms-365-mcp-server \
  --org-mode \
  --extra-scopes 'CopilotPackages.ReadWrite.All'

This is for use with your own Azure app registration (MS365_MCP_CLIENT_ID / MS365_MCP_CLIENT_SECRET): the default Softeria app only declares a lean, fixed permission set, so request additional scopes against an app you control (your tenant admin consents to them there). CLI value takes precedence over the env var; an empty value fails at startup.

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.

Personal Account (MSA)

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

Work/School Account (Global)

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

Work/School Account (China 21Vianet)

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

Claude Code CLI

Personal Account (MSA)

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

Work/School Account (Global)

# macOS/Linux
claude mcp add ms365 -- npx -y @softeria/ms-365-mcp-server --org-mode

# Windows (use cmd /c wrapper)
claude mcp add ms365 -s user -- cmd /c "npx -y @softeria/ms-365-mcp-server --org-mode"

Work/School Account (China 21Vianet)

# macOS/Linux
claude mcp add ms365-china -- npx -y @softeria/ms-365-mcp-server --org-mode --cloud china

# Windows (use cmd /c wrapper)
claude mcp add ms365-china -s user -- cmd /c "npx -y @softeria/ms-365-mcp-server --org-mode --cloud china"

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

Open WebUI

Open WebUI supports MCP servers via HTTP transport with OAuth 2.1.

1. Start the server with HTTP mode:

``bash npx @softeria/ms-365-mcp-server --http ``

1. In Open WebUI, go to Admin Settings → Tools (/admin/settings/tools) → Add Connection:

• Type: MCP Streamable HTTP
• URL: Your MCP server URL with /mcp path
• Auth: OAuth 2.1

1. Click Register Client.

> Note: Dynamic client registration is enabled by default in HTTP mode. Use --no-dynamic-registration to disable it. If using a custom Azure Entra app, the platform type for your redirect URI depends on whether the app has a client secret: with a secret use "Web", without one use "Mobile and desktop applications" (never "Single-page application").

Quick test setup using the default Azure app (ID ms-365 and localhost:8080 are pre-configured):

docker run -d -p 8080:8080 \
  -e WEBUI_AUTH=false \
  -e OPENAI_API_KEY \
  ghcr.io/open-webui/open-webui:main

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

Then add connection with URL http://localhost:3000/mcp and ID ms-365.

> Running in Docker behind a reverse proxy? Set --public-url https://your-domain.com so the OAuth authorize URL handed to the user's browser is reachable from outside the container network. See [docs/deployment.md](docs/deployment.md) for the full guide.

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:

``bash 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:

1. Create Azure AD App Registration:

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

1. 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).

1. 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)

1. Get Credentials:

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

1. Configure Environment Variables:

Create a .env file in your project root: ``env MS365_MCP_CLIENT_ID=your-azure-ad-app-client-id-here MS365_MCP_CLIENT_SECRET=your-secret-here # Optional for public apps 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.

Multi-Account Support

Use a single server instance to serve multiple Microsoft accounts. When more than one account is logged in, an account parameter is automatically injected into every tool, allowing you to specify which account to use per tool call.

Login multiple accounts (one-time per account):

# Login first account (device code flow)
npx @softeria/ms-365-mcp-server --login
# Follow the device code prompt, sign in as personal@outlook.com

# Login second account
npx @softeria/ms-365-mcp-server --login
# Follow the device code prompt, sign in as work@company.com

List configured accounts:

npx @softeria/ms-365-mcp-server --list-accounts

Use in tool calls: Pass "account": "work@company.com" in any tool request:

{ "tool": "list-mail-messages", "arguments": { "account": "work@company.com" } }

Behavior:

• With a single account configured, it auto-selects (no account parameter needed).
• With multiple accounts and no account parameter, the server u

…

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Softeria
• Source: Softeria/ms-365-mcp-server
• License: MIT

Install and usage instructions live in the source repository linked above.