npm package: @hurtener/ms-365-mcp-server
Description:  A Model Context Protocol (MCP) server for interacting with Microsoft 365 and Office services through the Graph API
Author: hurtener
Latest version: 1.3.1

# 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:

```json
{
  "value": [
    {
      "id": "1",
      "displayName": "Alice Johnson",
      "mail": "alice@example.com",
      "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,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:

```bash
npx @hurtener/ms-365-mcp-server --toon
```

Via Claude Desktop configuration:

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

Via environment variable:

```bash
MS365_MCP_OUTPUT_FORMAT=toon npx @hurtener/ms-365-mcp-server
```

## Supported Services & Tools

### Personal Account Tools (Available by default)

**Email (Outlook)**  
<sub>list-mail-messages, list-mail-folders, list-mail-folder-messages, get-mail-message, send-mail,
delete-mail-message, create-draft-email, move-mail-message</sub>

**Calendar**  
<sub>list-calendars, list-calendar-events, get-calendar-event, get-calendar-view, create-calendar-event,
update-calendar-event, delete-calendar-event</sub>

**OneDrive Files**  
<sub>list-drives, get-drive-root-item, list-folder-files, download-onedrive-file-content, upload-file-content,
upload-new-file, delete-onedrive-file</sub>

**Excel Operations**  
<sub>list-excel-worksheets, get-excel-range, create-excel-chart, format-excel-range, sort-excel-range</sub>

**OneNote**  
<sub>list-onenote-notebooks, list-onenote-notebook-sections, list-onenote-section-pages, get-onenote-page-content,
create-onenote-page</sub>

**To Do Tasks**  
<sub>list-todo-task-lists, list-todo-tasks, get-todo-task, create-todo-task, update-todo-task, delete-todo-task</sub>

**Planner**  
<sub>list-planner-tasks, get-planner-plan, list-plan-tasks, get-planner-task, create-planner-task</sub>

**Contacts**  
<sub>list-outlook-contacts, get-outlook-contact, create-outlook-contact, update-outlook-contact,
delete-outlook-contact</sub>

**User Profile**  
<sub>get-current-user</sub>

**Search**  
<sub>search-query</sub>

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

**Teams & Chats**
<sub>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, list-chat-members, get-chat-details,
find-chats-by-participant, list-recent-chats, get-chat-context, search-messages, list-channel-members</sub>

**Online Meetings & Transcripts**
<sub>list-online-meetings, list-meeting-transcripts, get-meeting-transcript-content</sub>

**SharePoint Sites**  
<sub>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</sub>

**Shared Mailboxes**  
<sub>list-shared-mailbox-messages, list-shared-mailbox-folder-messages, get-shared-mailbox-message,
send-shared-mailbox-mail</sub>

**User Management**  
<sub>list-users, search-users, resolve-person</sub>

### Canvas-Oriented Custom Tools

This fork includes a custom normalization and resolution layer aimed at Canvas and other chat-first agents. These tools
do not change the raw Graph tool payloads; they add normalized, ranked, path-first responses on top.

**People**

- `search-users`
- `resolve-person`
- `get-user`
- `get-manager`
- `get-direct-reports`
- `search-people-across-surfaces`

**Teams**

- `list-chat-members`
- `get-chat-details`
- `find-chats-by-participant`
- `list-recent-chats`
- `get-chat-context`
- `search-messages`
- `list-channel-members`

**Files**

- `resolve-drive-path`
- `list-folder`
- `search-files`
- `get-file-metadata`
- `get-file-content`
- `get-file-text`
- `get-file-context`
- `create-text-file`
- `update-text-file`
- `edit-text-file`
- `delete-file`

**SharePoint**

- `list-sites`
- `search-sites`
- `list-site-drives`
- `list-document-libraries`
- `search-site-files`
- `search-sharepoint-content`
- `list-sharepoint-pages`
- `list-sharepoint-lists`
- `list-sharepoint-list-items`
- `search-sharepoint-pages`

**Calendar**

- `search-calendar-events`
- `resolve-attendees`
- `find-availability`
- `accept-calendar-event`
- `decline-calendar-event`
- `tentatively-accept-calendar-event`
- `get-calendar-event-details`
- `suggest-meeting-times`
- `create-calendar-event-with-attendees`
- `create-calendar-event-from-availability`
- `reschedule-calendar-event`
- `list-calendars-details`

**Tasks**

- `search-tasks`
- `list-task-lists`
- `list-tasks`
- `get-task-context`
- `complete-task`
- `reopen-task`

**Mail**

- `search-mail`
- `resolve-mail-recipients`
- `list-attachments`
- `get-attachment-content`
- `thread-mail`
- `find-related-mail`
- `search-mail-by-person`
- `get-mail-context`
- `reply-mail`
- `reply-all-mail`
- `forward-mail`
- `draft-mail-reply`
- `draft-mail-reply-all`
- `draft-mail-forward`

**Cross-Surface Search**

- `search-m365-content`

### Custom Tool Scopes

These custom tools request scopes independently from `endpoints.json` so they work with filtered tool sets:

| Tool family                                                                                                                      | Scopes                                                                                                   |
| -------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| People resolution (`search-users`, `resolve-person`, `get-user`, `get-manager`, `get-direct-reports`)                            | `User.Read.All`                                                                                          |
| Teams chat resolution (`list-chat-members`, `get-chat-details`, `list-recent-chats`)                                             | `Chat.Read`                                                                                              |
| Teams participant/message search (`find-chats-by-participant`, `get-chat-context`, `search-messages`)                            | `Chat.Read`, `User.Read.All`, `ChatMessage.Read`, `ChannelMessage.Read.All` as needed                    |
| Teams channel members (`list-channel-members`)                                                                                   | `ChannelMember.Read.All`                                                                                 |
| Files (`resolve-drive-path`, `list-folder`, `search-files`, `get-file-*`)                                                        | `Files.Read`, `Files.Read.All`, `Sites.Read.All`                                                         |
| File writes (`create-text-file`, `update-text-file`, `edit-text-file`, `delete-file`)                                            | `Files.ReadWrite`, `Sites.ReadWrite.All`                                                                 |
| SharePoint (`list-sites`, `search-sites`, `list-site-drives`, `search-site-files`, `search-sharepoint-*`)                        | `Sites.Read.All`                                                                                         |
| Calendar (`search-calendar-events`, `get-calendar-event-details`, `list-calendars-details`)                                      | `Calendars.Read`                                                                                         |
| Meeting resolution (`resolve-attendees`, `find-availability`, `suggest-meeting-times`)                                           | `Calendars.Read`, `User.Read.All`                                                                        |
| Calendar responses (`accept-calendar-event`, `decline-calendar-event`, `tentatively-accept-calendar-event`)                      | `Calendars.ReadWrite`                                                                                    |
| Calendar writes (`create-calendar-event-with-attendees`, `create-calendar-event-from-availability`, `reschedule-calendar-event`) | `Calendars.ReadWrite`, `User.Read.All`                                                                   |
| Tasks (`search-tasks`, `list-task-lists`, `list-tasks`, `get-task-context`)                                                      | `Tasks.Read`                                                                                             |
| Task updates (`complete-task`, `reopen-task`)                                                                                    | `Tasks.ReadWrite`                                                                                        |
| Mail (`search-mail`, `list-attachments`, `get-attachment-content`, `thread-mail`, `find-related-mail`, `get-mail-context`)       | `Mail.Read`                                                                                              |
| Mail recipient/person resolution (`resolve-mail-recipients`, `search-mail-by-person`)                                            | `Mail.Read`, `User.Read.All`                                                                             |
| Mail actions (`reply-mail`, `reply-all-mail`, `forward-mail`, `draft-mail-*`)                                                    | `Mail.ReadWrite`, `User.Read.All` as needed                                                              |
| Cross-surface search (`search-m365-content`)                                                                                     | `Mail.Read`, `Chat.Read`, `ChannelMessage.Read.All`, `Files.Read.All`, `Sites.Read.All`, `User.Read.All` |

### Custom Tool Contracts

All Canvas-oriented custom tools follow these response conventions:

- camelCase field names
- object responses, never raw top-level arrays
- `items` for collections
- deterministic ordering and ranking
- opaque `cursor` / `nextCursor` values
- structured identity objects instead of raw Graph fragments
- MCP-friendly structured errors with `isError: true`
- path-first file operations wherever Microsoft exposes path semantics
- additive `label` fields on normalized entities and search hits
- `previewOnly` on agent-oriented custom mutation wrappers

#### Error Contract

Custom tools return structured JSON errors in the response body:

```json
{
  "error": "ambiguous_match",
  "message": "Multiple users matched the email address.",
  "candidates": [
    {
      "userId": "user-123",
      "label": "Juan Casiraghi <juan@company.com>",
      "rank": 1
    }
  ]
}
```

Standard error codes currently used:

- `not_found`
- `user_not_found`
- `chat_not_found`
- `chat_members_unavailable`
- `insufficient_scope`
- `ambiguous_match`
- `unsupported_operation`
- `unsupported_chat_type`
- `unsupported_scope`
- `invalid_cursor`

For `insufficient_scope` responses, custom tools now include:

- `requiredScopes`
- `missingScopes` when the current token claims make the gap inferable

### Non-Teams Contract Highlights

- Files and SharePoint tools return path-first `driveId` + `itemId` summaries so Canvas does not need Graph IDs up
  front.
- SharePoint file access is path-first and site-aware with this precedence:
  1. explicit `driveId`
  2. explicit `siteId` without `driveId`
  3. fallback to the signed-in user's default drive
- `list-document-libraries` is the preferred app-facing entrypoint for SharePoint document libraries, while
  `list-site-drives` remains as a lower-level alias.
- `get-file-text` and `get-file-context` provide normalized extraction for text-like files, PDFs, and common Office
  documents, while unsupported binary formats return `extractionStatus: "unsupported"`.
- `edit-text-file` applies structured replace/append/prepend/overwrite operations and supports `previewOnly`.
- Calendar tools return enriched organizer, attendee, location, online meeting, and body preview fields through
  `get-calendar-event-details`.
- Availability tools expose `allAttendeesAvailable`, attendee counts, and a heuristic `rankingScore` so agents can
  prefer slots where every required attendee is free.
- `create-calendar-event-from-availability` creates the event in the best fully-available slot by default and only
  falls back to partial availability when `allowPartialAvailability=true`.
- `reschedule-calendar-event` reuses the same availability heuristic to move existing events instead of forcing the
  agent to manually patch times, and it avoids selecting the event's current slot as the "new" schedule.
- Task tools add filtering, counts, and task context on top of the raw To Do endpoints.
- Mail tools now include thread/context wrappers plus direct send and draft wrappers for reply/reply-all/forward.
- `search-m365-content` returns one normalized result surface across mail, chat messages, files, and SharePoint pages.
- All new collection tools return `{ items, nextCursor? }`.

### SharePoint App Surface

The current SharePoint surface is read-oriented and retrieval-first. It is intended for app and agent workflows such as:

- finding a site
- listing document libraries
- browsing folders by path
- searching files within a site
- reading SharePoint-hosted file text and context
- searching SharePoint content and pages
- listing lists and list items for structured data scenarios

Recommended app-facing SharePoint/file entrypoints:

- `list-sites`
- `search-sites`
- `list-document-libraries`
- `list-folder`
- `search-site-files`
- `get-file-text`
- `get-file-context`
- `search-sharepoint-content`
- `list-sharepoint-pages`

Operational list/data follow-ups:

- `list-sharepoint-lists`
- `list-sharepoint-list-items`

This milestone is intentionally read-only for SharePoint pages and lists. File editing remains available through the
existing path-first file tools.

#### SharePoint Examples

Find a site:

```json
{
  "query": "Marketing",
  "limit": 10
}
```

List a site's document libraries:

```json
{
  "siteId": "site-1",
  "limit": 20
}
```

Browse a library folder by path:

```json
{
  "siteId": "site-1",
  "path": "/Shared Documents/Plans",
  "limit": 50
}
```

Search files inside one site and optional path prefix:

```json
{
  "siteId": "site-1",
  "query": "launch plan",
  "path": "/Shared Documents/Plans",
  "limit": 25
}
```

Read SharePoint-backed file text:

```json
{
  "siteId": "site-1",
  "path": "/Shared Documents/Plans/launch.md",
  "maxChars": 20000
}
```

Search SharePoint content and pages:

```json
{
  "siteId": "site-1",
  "query": "launch",
  "limit": 25
}
```

#### `search-users`

Input:

```json
{
  "query": "Juan Casiraghi",
  "limit": 10
}
```

Output:

```json
{
  "items": [
    {
      "userId": "user-123",
      "displayName": "Juan Casiraghi",
      "givenName": "Juan",
      "surname": "Casiraghi",
      "email": "juan@company.com",
      "userPrincipalName": "juan@company.com",
      "jobTitle": null,
      "department": null,
      "matchScore": 0.98,
      "matchReasons": ["displayName_exact"]
    }
  ]
}
```

#### `list-chat-members`

Input:

```json
{
  "chatId": "19:...@thread.v2"
}
```

Output:

```json
{
  "chatId": "19:...@thread.v2",
  "members": [
    {
      "memberId": "membership-1",
      "userId": "user-123",
      "displayName": "Juan Casiraghi",
      "email": "juan@company.com",
      "userPrincipalName": "juan@company.com",
      "roles": ["owner"],
      "membershipType": "owner"
    }
  ]
}
```

#### `get-chat-details`

Input:

```json
{
  "chatId": "19:...@thread.v2",
  "includeMembers": true
}
```

Output:

```json
{
  "id": "19:...@thread.v2",
  "chatType": "oneOnOne",
  "topic": null,
  "lastUpdatedDateTime": "2026-03-12T12:00:00Z",
  "webUrl": "https://teams.microsoft.com/...",
  "memberCount": 2,
  "members": [
    {
      "userId": "user-123",
      "displayName": "Juan Casiraghi",
      "email": "juan@company.com"
    }
  ]
}
```

#### `find-chats-by-participant`

Input:

```json
{
  "email": "juan@company.com",
  "includeGroupChats": true,
  "limit": 10
}
```

Output:

```json
{
  "items": [
    {
      "chat": {
        "id": "19:...@thread.v2",
        "chatType": "oneOnOne",
        "topic": null,
        "lastUpdatedDateTime": "2026-03-12T12:00:00Z",
        "webUrl": "https://teams.microsoft.com/...",
        "memberCount": 2
      },
      "members": [
        {
          "userId": "user-123",
          "displayName": "Juan Casiraghi",
          "email": "juan@company.com"
        }
      ],
      "matchType": "exact_one_on_one",
      "rank": 1,
      "matchReasons": ["participant_exact", "one_on_one", "recent"]
    }
  ]
}
```

#### `list-recent-chats`

Input:

```json
{
  "limit": 20,
  "includeMembers": true
}
```

Output:

```json
{
  "items": [
    {
      "id": "19:...@thread.v2",
      "chatType": "group",
      "topic": "AI Leads",
      "lastUpdatedDateTime": "2026-03-12T12:00:00Z",
      "webUrl": null,
      "memberCount": 4,
      "members": [
        {
          "userId": "user-123",
          "displayName": "Juan Casiraghi",
          "email": "juan@company.com"
        }
      ]
    }
  ],
  "nextCursor": "opaque-cursor"
}
```

If member expansion fails for a specific chat, that item is still returned with:

```json
{
  "members": [],
  "membersUnavailable": true,
  "membersError": "chat_members_unavailable"
}
```

#### `get-chat-context`

Input:

```json
{
  "chatId": "19:...@thread.v2",
  "messageLimit": 10
}
```

Output:

```json
{
  "chat": {
    "id": "19:...@thread.v2",
    "chatType": "oneOnOne",
    "topic": null,
    "lastUpdatedDateTime": "2026-03-12T12:00:00Z",
    "memberCount": 2
  },
  "members": [
    {
      "userId": "user-123",
      "displayName": "Juan Casiraghi",
      "email": "juan@company.com"
    }
  ],
  "recentMessages": [
    {
      "id": "msg-1",
      "from": {
        "userId": "user-123",
        "displayName": "Juan Casiraghi"
      },
      "createdDateTime": "2026-03-12T11:59:00Z",
      "bodyPreview": "deploy prod tonight"
    }
  ]
}
```

#### `search-messages`

Input:

```json
{
  "query": "deploy prod",
  "participantUserId": "user-123",
  "scope": "chats",
  "limit": 20
}
```

Output:

```json
{
  "items": [
    {
      "chatId": "19:...@thread.v2",
      "messageId": "msg-1",
      "chatType": "group",
      "topic": "AI Leads",
      "from": {
        "userId": "user-123",
        "displayName": "Juan Casiraghi"
      },
      "createdDateTime": "2026-03-12T11:59:00Z",
      "bodyPreview": "deploy prod tonight"
    }
  ]
}
```

Only `scope: "chats"` is currently supported.

#### `resolve-person`

Input:

```json
{
  "query": "Juan Casiraghi"
}
```

Output is either a single normalized user object or an `ambiguous_match` / `user_not_found` error.

#### `list-user-presence`

Input:

```json
{
  "userIds": ["user-123", "user-456"]
}
```

Output:

```json
{
  "items": [
    {
      "userId": "user-123",
      "availability": "Available",
      "activity": "Available",
      "statusMessage": null
    }
  ]
}
```

#### `list-channel-members`

Input:

```json
{
  "teamId": "team-123",
  "channelId": "channel-456"
}
```

Output:

```json
{
  "teamId": "team-123",
  "channelId": "channel-456",
  "members": [
    {
      "userId": "user-123",
      "displayName": "Juan Casiraghi",
      "email": "juan@company.com",
      "roles": ["member", "owner"],
      "membershipType": "owner",
      "membershipOrigins": ["direct", "indirect"]
    }
  ]
}
```

For shared channels, duplicate memberships are deduplicated by identity and their origin hints are retained in
`membershipOrigins`.

## Organization/Work Mode

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

```json
{
  "mcpServers": {
    "ms365": {
      "command": "npx",
      "args": ["-y", "@hurtener/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:

![Login example](https://github.com/user-attachments/assets/27f57f0e-57b8-4366-a8d1-c0bdab79900c)

## Examples

![Image](https://github.com/user-attachments/assets/ed275100-72e8-4924-bcf2-cd8e1b4c6f3a)

## Integration

### Claude Desktop

To add this MCP server to Claude Desktop, edit the config file under Settings > Developer.

#### Personal Account (MSA)

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

#### Work/School Account (Global)

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

#### Work/School Account (China 21Vianet)

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

### Claude Code CLI

#### Personal Account (MSA)

```bash
claude mcp add ms365 -- npx -y @hurtener/ms-365-mcp-server
```

#### Work/School Account (Global)

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

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

#### Work/School Account (China 21Vianet)

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

# Windows (use cmd /c wrapper)
claude mcp add ms365-china -s user -- cmd /c "npx -y @hurtener/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 and dynamic registration enabled:

   ```bash
   npx @hurtener/ms-365-mcp-server --http --enable-dynamic-registration
   ```

2. 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

3. Click **Register Client**.

> **Note**: The `--enable-dynamic-registration` is required for Open WebUI to work. If using a custom Azure Entra app, add your redirect URI under "Mobile and desktop applications" platform (not "Single-page application").

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

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

npx @hurtener/ms-365-mcp-server --http --enable-dynamic-registration
```

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

![Open WebUI MCP Connection](https://github.com/user-attachments/assets/dcab71dd-cf02-4bcb-b7db-5725d6be4064)

### Stateless HTTP Sidecars

Pooled HTTP sidecars should use the HTTP transport in stateless bearer-header mode.

- Run the server with `--http`
- Send MCP traffic to `/mcp`
- Include `Authorization: Bearer <Graph access token>` on every request
- Optionally include `x-microsoft-refresh-token: <refresh_token>`
- Do not rely on `MS365_MCP_OAUTH_TOKEN` for sidecar execution
- Sidecar pools may safely reuse the same process across users because auth is request-scoped

Example:

```bash
npx @hurtener/ms-365-mcp-server --http 3000 --org-mode
```

Contract details live in [docs/stateless-http-sidecar.md](./docs/stateless-http-sidecar.md).

### Local Development

For local development or testing:

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

Or configure Claude Desktop manually:

```json
{
  "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 @hurtener/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. HTTP Bearer Auth and OAuth Discovery

When running with `--http`, the server is designed for stateless per-request authentication.

**Stateless sidecar path (recommended):**

- Send requests directly to `/mcp`
- Include `Authorization: Bearer <token>` on every request
- Optionally include `x-microsoft-refresh-token`
- No session stickiness is required
- No `MS365_MCP_OAUTH_TOKEN` is required for sidecar operation

**Generic MCP HTTP client path:**

- The server still advertises OAuth capabilities for clients like Open WebUI
- OAuth discovery, token, authorization, and dynamic registration remain available

#### 2a. OAuth Authorization Code Flow (HTTP mode only)

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

```bash
npx @hurtener/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 without promoting request tokens into shared process auth state
- **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](https://portal.azure.com)
- 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 (optional for public apps)

5. **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 for stdio or process-scoped usage:

```bash
MS365_MCP_OAUTH_TOKEN=your_oauth_token npx @hurtener/ms-365-mcp-server
```

This method:

- Bypasses the interactive authentication flows
- Uses your pre-existing OAuth token for Microsoft Graph API requests
- Does not handle token refresh (token lifecycle management is your responsibility)
- Is not the preferred transport model for stateless HTTP sidecars

> **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):

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

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

**List configured accounts:**

```bash
npx @hurtener/ms-365-mcp-server --list-accounts
```

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

```json
{ "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 uses the selected default or returns a helpful error listing available accounts.
- **100% backward compatible**: existing single-account setups work unchanged.
- The `account` parameter accepts email address (e.g. `user@outlook.com`) or MSAL `homeAccountId`.

> **For MCP multiplexers (Legate, Governor):** Multi-account mode replaces the N-process pattern. Instead of spawning one server per account, a single instance handles all accounts via the `account` parameter, reducing tool duplication from N×110 to 110.

## Tool Presets

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

```bash
npx @hurtener/ms-365-mcp-server --preset mail
npx @hurtener/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)
--cloud <type>    Microsoft cloud environment: global (default) or china (21Vianet)
```

### 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)
--enable-dynamic-registration Enable OAuth Dynamic Client Registration endpoint (required for Open WebUI)
--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)
- `MS365_MCP_BODY_FORMAT=html`: Return email bodies as HTML instead of plain text (default: text)
- `MS365_MCP_CLOUD_TYPE=global|china`: Microsoft cloud environment (alternative to --cloud 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 in stdio/process-scoped BYOT mode
- `MS365_MCP_KEYVAULT_URL`: Azure Key Vault URL for secrets management (see Azure Key Vault section)
- `MS365_MCP_TOKEN_CACHE_PATH`: Custom file path for MSAL token cache (see Token Storage below)
- `MS365_MCP_SELECTED_ACCOUNT_PATH`: Custom file path for selected account metadata (see Token Storage below)

## Token Storage

Authentication tokens are stored using the OS credential store (via keytar) when available. If keytar is not installed or fails (common on headless Linux), the server falls back to file-based storage.

**Default fallback paths** are relative to the installed package directory. This means tokens can be lost when the package is reinstalled or updated via npm.

To persist tokens across updates, set custom paths outside the package directory:

```bash
export MS365_MCP_TOKEN_CACHE_PATH="$HOME/.config/ms365-mcp/.token-cache.json"
export MS365_MCP_SELECTED_ACCOUNT_PATH="$HOME/.config/ms365-mcp/.selected-account.json"
```

Parent directories are created automatically. Files are written with `0600` permissions.

> **Security note**: File-based token storage writes sensitive credentials to disk. Ensure the chosen directory has appropriate access controls. The OS credential store (keytar) is preferred when available.

## Azure Key Vault Integration

For production deployments, you can store secrets in Azure Key Vault instead of environment variables. This is particularly useful for Azure Container Apps with managed identity.

### Setup

1. **Create a Key Vault** (if you don't have one):

   ```bash
   az keyvault create --name your-keyvault-name --resource-group your-rg --location eastus
   ```

2. **Add secrets to Key Vault**:

   ```bash
   az keyvault secret set --vault-name your-keyvault-name --name ms365-mcp-client-id --value "your-client-id"
   az keyvault secret set --vault-name your-keyvault-name --name ms365-mcp-tenant-id --value "your-tenant-id"
   # Optional: if using confidential client flow
   az keyvault secret set --vault-name your-keyvault-name --name ms365-mcp-client-secret --value "your-secret"
   ```

3. **Grant access to Key Vault**:

   For Azure Container Apps with managed identity:

   ```bash
   # Get the managed identity principal ID
   PRINCIPAL_ID=$(az containerapp show --name your-app --resource-group your-rg --query identity.principalId -o tsv)

   # Grant access to Key Vault secrets
   az keyvault set-policy --name your-keyvault-name --object-id $PRINCIPAL_ID --secret-permissions get list
   ```

   For local development with Azure CLI:

   ```bash
   # Your Azure CLI identity already has access if you have appropriate RBAC roles
   az login
   ```

4. **Configure the server**:
   ```bash
   MS365_MCP_KEYVAULT_URL=https://your-keyvault-name.vault.azure.net npx @hurtener/ms-365-mcp-server
   ```

### Secret Name Mapping

| Key Vault Secret Name   | Environment Variable    | Required                  |
| ----------------------- | ----------------------- | ------------------------- |
| ms365-mcp-client-id     | MS365_MCP_CLIENT_ID     | Yes                       |
| ms365-mcp-tenant-id     | MS365_MCP_TENANT_ID     | No (defaults to 'common') |
| ms365-mcp-client-secret | MS365_MCP_CLIENT_SECRET | No                        |

### Authentication

The Key Vault integration uses `DefaultAzureCredential` from the Azure Identity SDK, which automatically tries multiple authentication methods in order:

1. Environment variables (AZURE_CLIENT_ID, AZURE_CLIENT_SECRET, AZURE_TENANT_ID)
2. Managed Identity (recommended for Azure Container Apps)
3. Azure CLI credentials (for local development)
4. Visual Studio Code credentials
5. Azure PowerShell credentials

### Optional Dependencies

The Azure Key Vault packages (`@azure/identity` and `@azure/keyvault-secrets`) are optional dependencies. They are only loaded when `MS365_MCP_KEYVAULT_URL` is configured. If you don't use Key Vault, these packages are not required.

## 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:

```bash
npm run verify
```

### For Developers

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

```bash
npm run generate
```

## Support

If you're having problems or need help:

- Create an [issue](https://github.com/hurtener/ms-365-mcp-server/issues)
- Start a [discussion](https://github.com/hurtener/ms-365-mcp-server/discussions)
- For fork-specific behavior, prefer issues or discussions in this repository.

## Maintainers

This fork builds on the original work by Softeria.

- Original upstream: Softeria / Eirik Brevik
- Fork maintainer: Hurtener
- Implementation and maintenance support: Santiago Benvenuto and OpenAI Codex

## License

MIT © 2026 Hurtener