google-tasks-mcp

An MCP server for Google Tasks with the full API surface: task-list CRUD, task CRUD, move/reorder, and a diff_tasks change-harvester that tells you what happened since your agent last looked.

Built for agents that maintain a task mirror (project lists your assistant keeps in sync, completions you tick on your phone that the agent picks up later), but it works fine as a general Tasks connector.

Why another one

The existing options each miss something this use case needs:

• zcaceres/gtasks-mcp, the most-cited one, has no task-list operations at all: you can't create, rename, or delete lists, which rules out per-project lists entirely. The gtasks-mcp npm name is also a tombstone (the package was unpublished).
• arpitbatra123/mcp-googletasks covers the full surface but isn't on npm, so it's clone-and-build, and auth means pasting an OAuth code back through a tool call.
• google_workspace_mcp does everything, plus all of Workspace, plus an OAuth 2.1 setup and a native-build gotcha on Windows. Overkill if you only want Tasks.

None of them deal with the API's nastiest quirk: tasks completed in the Google Tasks apps become hidden, so a naive query silently misses exactly the completions a sync agent needs to see. diff_tasks exists because of that quirk.

Install

# 1. One-time auth (see Google Cloud setup below first)
npx google-tasks-mcp auth

# 2. Register with your MCP client, e.g. Claude Code:
claude mcp add -s user gtasks -- npx google-tasks-mcp

Any MCP-capable client works; the server speaks stdio.

Google Cloud setup (one-time, ~15 minutes)

The Tasks API requires your own OAuth client. No verification, no billing.

1. console.cloud.google.com → create a project.
2. APIs & Services → Library → enable Google Tasks API.
3. Google Auth Platform (consent screen): User type External (Internal is Workspace-only). App name + your email. Scope: https://www.googleapis.com/auth/tasks (classified sensitive, not restricted: no security audit needed).
4. Credentials → Create credentials → OAuth client ID → Desktop app → download the JSON.
5. Save it as ~/.config/google-tasks-mcp/client_secret.json (or point GTASKS_MCP_CREDENTIALS at it).
6. The trap everyone hits: while the consent screen's publishing status is "Testing", refresh tokens expire every 7 days and you will re-auth weekly. Set publishing status to In production (skip verification; you'll click through a one-time "Google hasn't verified this app" interstitial: Advanced → Continue). Tokens then persist indefinitely.
7. Run npx google-tasks-mcp auth: a browser opens, you approve, the refresh token lands in ~/.config/google-tasks-mcp/token.json. Done forever (revoking access or 6 months of disuse are the only expiries).

Environment variables

Variable	Default	Purpose
GTASKS_MCP_DIR	~/.config/google-tasks-mcp	Config directory
GTASKS_MCP_CREDENTIALS	<dir>/client_secret.json	OAuth client file
GTASKS_MCP_TOKEN	<dir>/token.json	Cached refresh token

Tools

Task lists: list_tasklists, get_tasklist, create_tasklist, update_tasklist, delete_tasklist

Tasks: list_tasks (filters: completed/hidden/deleted, updatedMin, due bounds), get_task, create_task, update_task, complete_task, delete_task, move_task (reorder, re-parent, or move across lists)

Sync: diff_tasks(since, [tasklist]) returns everything that changed after an RFC3339 timestamp, grouped per list into completed / active / deleted. It sweeps every list unless you name one.

Design notes (API sharp edges, handled)

• Due dates are date-only. The API silently discards the time portion, and naive RFC3339 values can land a day off. Pass YYYY-MM-DD; the server normalizes to UTC midnight.
• App-completed tasks go hidden. Ticking a task in the Google Tasks app sets hidden: true; a plain list call never sees it again. diff_tasks always queries with showCompleted + showHidden + showDeleted, so nothing is missed.
• No sync tokens. Unlike the Calendar API, Tasks has no incremental sync token. diff_tasks uses updatedMin; keep a snapshot on your side and pass its timestamp.
• position is read-only. Reordering only works through move_task (parent + previous). This includes subtask nesting.
• There is deliberately no clear_completed tool. The API's tasks.clear wipes completed tasks from a list, which permanently destroys the evidence diff_tasks depends on. An LLM should not be able to call that casually. If you truly need it, the Tasks apps expose it in their UI.

Development

git clone https://github.com/justerlex/google-tasks-mcp
cd google-tasks-mcp
npm install
npm run build
node dist/index.js auth   # one-time
node dist/index.js        # stdio server

One TypeScript file, ~450 lines: src/index.ts.

License

MIT