For Microsoft To Do

🇫🇷 Version française : README.fr.md

MCP server to drive Microsoft To Do from Claude Code, Claude Desktop, or any MCP-compatible client.

Works with any Microsoft account: personal (outlook.com, hotmail.com, live.com), Office 365 personal or business, Microsoft 365. Zero Azure setup required on the user side — just sign in via device code flow.

npm license

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🚀 End-user installation

Prerequisites (all clients)

• Node.js 20+ (nodejs.org)
• A Microsoft account (free or paid)

No Azure account required, no App Registration to create, nothing to compile.

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🟦 Claude Code (CLI)

Install (one command):

claude mcp add --transport stdio microsoft-todo -- npx -y @mag-cie/mcp-microsoft-todo

If you have a personal Microsoft account (outlook.com, hotmail.com, live.com, msn.com, Office 365 personal), add MS_TENANT=consumers:

claude mcp add --transport stdio microsoft-todo --env MS_TENANT=consumers -- npx -y @mag-cie/mcp-microsoft-todo

Verify it's wired up:

claude mcp list

First use — recommended: pre-auth in a terminal first to avoid the "stuck on first MCP call" issue (where the device code is printed to MCP stderr but Claude Code doesn't surface it):

# macOS / Linux
MS_TENANT=consumers npx -y @mag-cie/mcp-microsoft-todo@latest --auth

# Windows PowerShell
$env:MS_TENANT="consumers"; npx -y @mag-cie/mcp-microsoft-todo@latest --auth

You'll see:

To sign in, use a web browser to open the page https://www.microsoft.com/link and enter the code XXXXXXXXX

Visit the URL, enter the code, sign in. The token is cached in ~/.mcp-microsoft-todo/token-cache.json and refreshed automatically — you'll never have to do this again. Now go to Claude Code and any prompt that calls a tool will work instantly.

Skip the pre-auth step if you're feeling lucky — the MCP will trigger the device code flow on first call too. The code goes to the Claude Code MCP log file (look in %USERPROFILE%\.claude\logs\ on Windows or ~/.claude/logs/ elsewhere).

Update to the latest version:

claude mcp remove microsoft-todo
claude mcp add --transport stdio microsoft-todo -- npx -y @mag-cie/mcp-microsoft-todo@latest

The -y flag of npx auto-accepts the download. Without @latest, npx may serve a stale cached version.

Uninstall:

claude mcp remove microsoft-todo
# Purge the token cache:
rm -rf ~/.mcp-microsoft-todo

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🟪 Claude Desktop (app)

1. Locate the config file:

OS	Path
Windows	%APPDATA%\Claude\claude_desktop_config.json
macOS	~/Library/Application Support/Claude/claude_desktop_config.json
Linux	~/.config/Claude/claude_desktop_config.json

On Windows, you can open it directly with:

notepad $env:APPDATA\Claude\claude_desktop_config.json

If the file doesn't exist, create it with an empty JSON object {} then edit.

2. Add the config:

{
  "mcpServers": {
    "microsoft-todo": {
      "command": "npx",
      "args": ["-y", "@mag-cie/mcp-microsoft-todo"]
    }
  }
}

For a personal Microsoft account, add env:

{
  "mcpServers": {
    "microsoft-todo": {
      "command": "npx",
      "args": ["-y", "@mag-cie/mcp-microsoft-todo"],
      "env": { "MS_TENANT": "consumers" }
    }
  }
}

To localize the compact-format strings (optional, see Localization):

{
  "env": { "MS_TENANT": "consumers", "MCP_LOCALE": "fr" }
}

3. Restart Claude Desktop COMPLETELY (not just close the window):

• Windows: right-click systray icon → Quit, then relaunch
• macOS: ⌘+Q then relaunch

4. Verify it's wired up:

In Claude Desktop, look at the 🔌 plug or 🔧 tools icon at the bottom right of the input area — you should see microsoft-todo listed.

5. First auth — recommended pre-auth in a terminal:

# macOS / Linux
MS_TENANT=consumers npx -y @mag-cie/mcp-microsoft-todo@latest --auth

# Windows PowerShell
$env:MS_TENANT="consumers"; npx -y @mag-cie/mcp-microsoft-todo@latest --auth

You'll see the device code immediately in the terminal. Visit the URL, enter the code, sign in. Token cached. Now Claude Desktop will reuse this cache — no need to fish in the logs.

Without --auth, the device code goes to the Claude Desktop MCP log file:

• Windows: %APPDATA%\Claude\logs\mcp-server-microsoft-todo.log
• macOS: ~/Library/Logs/Claude/mcp-server-microsoft-todo.log

Update: edit the version in args (@mag-cie/mcp-microsoft-todo@latest), restart Claude Desktop. Or let npx do its thing (npx cache ~24h).

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🟧 Cursor / Continue / other stdio MCP clients

Any MCP client that supports the stdio transport works the same way. Generic format:

command: npx
args: -y @mag-cie/mcp-microsoft-todo
env: MS_TENANT=consumers (if personal account)

Adapt to the client's config format (often JSON or TOML similar to Claude Desktop).

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💡 Example prompts

Once installed, just ask Claude in natural language. Sample prompts that exercise the main tools:

Prompt	Tool(s)
"Show me all my To Do lists"	list_task_lists
"What do I have to do today?"	summarize_today
"Show me my overdue tasks"	list_overdue_tasks
"List tasks tagged 'work'"	list_tasks_by_category
"Find any task containing 'invoice'"	search_tasks
"Add a daily recurring 'Workout' task"	create_task (with recurrence)
"Mark these 5 tasks as done"	batch_complete_tasks
"Move 'Buy bread' from Personal to Shopping"	move_task
"Add a 'recipe' subtask to the cake task"	create_checklist_item
"Tag all my Magaria tasks as 'urgent'"	bulk_update_categories
"Export my work tasks as iCalendar"	export_tasks_ics
"Attach a project_id metadata to this task"	set_extension

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🆘 Auth troubleshooting

Symptom	Solution
"This page isn't right" page after sign-in	Add MS_TENANT=consumers (personal accounts only)
Browser opens with the wrong Microsoft account	Use an InPrivate/Incognito window for the sign-in
invalid_scope or Tasks.ReadWrite.Shared error	Purge the token cache and re-auth: rm -rf ~/.mcp-microsoft-todo
Node.js not found or npx not found	Install Node 20+ from nodejs.org. On Windows, verify it's in PATH (relaunch your terminal after install)
Token expired, refresh fails	Purge the cache and re-auth
Device code never appears	Verify the server is spawning — Claude Code: claude mcp list; Claude Desktop: tools icon at the bottom. If absent, check the npx PATH in the config
MS_CLIENT_ID not configured	You're using a dev fork — export MS_CLIENT_ID or use the official npm version

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🛠 Available tools (28)

Safety column legend: read = read-only, write = mutates state (non-idempotent create), update = idempotent mutation (safe to retry), delete = destructive (data loss). See Safety annotations below for details.

Lists & tasks

Tool	Safety	Description
list_task_lists	read	All your To Do lists
list_tasks	read	Tasks of a list (OData filter, $orderby, paginate)
get_task	read	Detail of a task by ID
create_task	write	Create a task (title, body, importance, due date, categories, recurrence, reminder)
update_task	update	Update title, status, due date, recurrence, reminder…
complete_task	update	Mark as completed
delete_task	delete	Delete permanently
move_task	delete	Move a task from one list to another (source task is deleted)
search_tasks	read	Cross-list search by title
summarize_today	read	Summary of tasks due today + overdue
list_all_tasks	read	Every task across every list in one round-trip (uses Graph $batch)

Batch operations (saves API calls)

Tool	Safety	Description
batch_create_tasks	write	Create up to 100 tasks in a single Graph $batch HTTP call
batch_complete_tasks	update	Mark up to 100 tasks as completed in one call
batch_delete_tasks	delete	Delete up to 100 tasks in one call

Sub-tasks (checklist items)

Tool	Safety	Description
list_checklist_items	read	Sub-items of a task
create_checklist_item	write	Add a sub-item
update_checklist_item	update	Rename / check / uncheck
delete_checklist_item	delete	Delete a sub-item

Linked resources (external URLs attached to a task)

Tool	Safety	Description
list_linked_resources	read	List the linked resources of a task
create_linked_resource	write	Attach a URL or external reference
delete_linked_resource	delete	Delete a linked resource

Open extensions (custom JSON metadata)

Tool	Safety	Description
list_extensions	read	List the open extensions of a task
set_extension	update	Upsert: create or update an extension (project_id, external_ref, etc.)
delete_extension	delete	Delete an extension

Cross-list helpers

Tool	Safety	Description
list_overdue_tasks	read	All overdue tasks, aggregated across all lists
list_tasks_by_category	read	All tasks with a given category, cross-lists
bulk_update_categories	update	Add/remove categories on many tasks in 2 batch phases

Export

Tool	Safety	Description
export_tasks_ics	read	iCalendar export (VTODO + RRULE + VALARM) for import into Google Cal / Apple Cal / Outlook / Thunderbird

Output format

By default, tools return a compact text format (one line per item) to save LLM tokens. Legend:

• [!] high importance, [?] low (nothing if normal)
• [v] completed, [>] in progress, [w] waiting, [d] deferred (nothing if not started)
• due:, rem:, rec:, cat:, body: fields shown only when populated

To get the full Graph JSON, pass verbose: true to any read tool.

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🔐 Safety annotations

Every tool exposed by this server carries the MCP tool annotations defined by the Model Context Protocol spec (2025-06-18):

Annotation	Meaning
readOnlyHint	The tool only fetches data; running it has no side effects on Microsoft Graph
destructiveHint	The tool deletes data or otherwise causes data loss that cannot be undone
idempotentHint	Running the tool repeatedly with the same arguments yields the same end state (safe to retry)
openWorldHint	The tool talks to an external system (Microsoft Graph) — always true here
title	Human-readable display name for MCP clients

These hints are advisory — the server itself enforces nothing — but MCP clients (Claude Code, Claude Desktop, Cursor, …) can use them to:

• Auto-approve readOnlyHint: true calls without prompting (faster UX for read-heavy workflows)
• Show a confirmation dialog before destructiveHint: true calls (e.g. delete_task, batch_delete_tasks, move_task)
• Retry on transient failures only when idempotentHint: true
• Display the friendly title instead of the snake_case name

The full mapping is in src/index.ts (ANNOTATIONS constant). Summary by safety class (see also the per-tool Safety column above):

• read (15 tools): all list_*, get_*, search_*, summarize_*, export_* — readOnlyHint: true
• write (4 tools): create_*, batch_create_tasks — destructiveHint: false, idempotentHint: false
• update (5 tools): update_*, complete_*, set_extension, bulk_update_categories, batch_complete_tasks — destructiveHint: false, idempotentHint: true
• delete (5 tools): delete_*, batch_delete_tasks, move_task — destructiveHint: true, idempotentHint: true

move_task is classified as delete because it deletes the source task (a new task is created in the target list with a different id).

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🌍 Localization

The MCP works in any language out of the box — Claude reads the data the server returns and replies to the user in whatever language they prompted in. Try "List my tasks", "Liste mes tâches", "Zeig meine Aufgaben", "我的任务" — all work.

Optionally, you can localize the compact-format short labels returned by the server itself (No tasks., Due today:, Overdue:, Task X deleted., etc.) — this is a marginal improvement (saves a few tokens, slightly cleaner LLM context). Set MCP_LOCALE in your env:

Locale	Code
English (default)	en
Français	fr
Español	es
Deutsch	de

Resolution order: MCP_LOCALE → LC_ALL → LANG → fallback en. Only the first 2 chars are inspected (so fr_FR.UTF-8 works). Unsupported locale → falls back to en.

{
  "mcpServers": {
    "microsoft-todo": {
      "command": "npx",
      "args": ["-y", "@mag-cie/mcp-microsoft-todo"],
      "env": { "MCP_LOCALE": "fr" }
    }
  }
}

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🔒 Security & privacy

• The Microsoft token is stored only on your machine in ~/.mcp-microsoft-todo/token-cache.json
• No data transits through MAG&Cie servers
• Revoke access at any time at https://account.live.com/consent/Manage
• To purge the local token: rm -rf ~/.mcp-microsoft-todo

Graph permissions requested: Tasks.ReadWrite, Tasks.ReadWrite.Shared, offline_access.

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🧑‍💻 Developer setup (fork / contribution)

If you fork or want to develop locally with your own Azure AD App Registration:

1. Azure AD App Registration (maintainer/fork side only)

1. https://portal.azure.com → Microsoft Entra ID → App registrations → New registration
2. Name: mcp-microsoft-todo (free choice)
3. Supported account types: Accounts in any organizational directory and personal Microsoft accounts
4. Redirect URI: leave empty
5. Register
6. Note the Application (client) ID
7. Authentication tab → Allow public client flows: Yes
8. Authentication tab → Add a platform → Mobile and desktop applications → check https://login.microsoftonline.com/common/oauth2/nativeclient
9. API permissions tab → Add a permission → Microsoft Graph → Delegated → add Tasks.ReadWrite, Tasks.ReadWrite.Shared, and offline_access. Grant admin consent if on a corporate tenant.

2. Build and local auth

git clone https://github.com/MAG-Cie/mcp-microsoft-todo
cd mcp-microsoft-todo
npm install
npm run build
export MS_CLIENT_ID="<your-client-id>"   # PowerShell: $env:MS_CLIENT_ID="..."
export MS_TENANT="common"
npm run auth

The token cache will be written to ~/.mcp-microsoft-todo/token-cache.json.

3. Wire up Claude Code (local build)

# Windows PowerShell
$env:MS_CLIENT_ID="<your-client-id>"
claude mcp add --transport stdio microsoft-todo -- node "C:\path\to\mcp-microsoft-todo\dist\index.js"

# macOS / Linux
export MS_CLIENT_ID="<your-client-id>"
claude mcp add --transport stdio microsoft-todo -- node /path/to/mcp-microsoft-todo/dist/index.js

⚠️ Env vars must be visible at spawn time. On Windows with fnm, verify the PowerShell session that launches claude has MS_CLIENT_ID exported.

4. Run tests

npm test           # one-shot
npm run test:watch # watch mode

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⬆️ Upgrading from earlier versions

From	To	Action required
0.x	0.4.0+	Re-auth required: token cache lacks the new Tasks.ReadWrite.Shared scope. Run rm -rf ~/.mcp-microsoft-todo then trigger any tool to re-auth via device code.
0.x	0.5.0+	No breaking change — new tools added. Token compatible.
any	1.0.0+	Stable API marker. Future minor versions guarantee no breaking change to tool names, args, or return formats (compact + verbose).

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🗺 Roadmap

• v0.1 — stdio + 6 CRUD tools
• v0.2 — distributable npm package, baked-in client ID
• v0.3 — recurrence + reminders + checklists + linkedResources + search + move + summarize_today + retry/error robustness + vitest tests + compact format (verbose opt-in)
• v0.4 — auto pagination + $batch operations + Tasks.ReadWrite.Shared scope (read shared lists)
• v0.5 — open extensions + cross-list helpers (overdue, by category, bulk update) + iCalendar export
• v1.0 — stable milestone: GitHub Actions CI + extended tests + snapshot tests + README polish

Possible future versions:

• v1.1 — file attachments (Graph beta)
• v1.2 — auto-pagination follow-on for summarize_today / search_tasks / list_overdue_tasks
• v2.0 — remote HTTP/SSE transport for Claude.ai custom connectors (multi-user OAuth)

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📄 License

MIT — © MAG&Cie