Community project, not affiliated with or endorsed by Nextcloud GmbH. Formerly
nextcloud-task-mcp.
What you can say
| You say | What happens |
|---|---|
| "Add a high-priority task: finish the Q4 report by Thursday 5pm, remind me 2 hours before." | create_task with due date, priority and a VALARM reminder |
| "Add a weekly team sync, Mondays 10:00." | create_event with an RRULE |
| "Block Thursday 9-11 for the report." | create_event_from_task — a linked time block, task and event stay connected |
| "What does my Thursday look like?" | get_agenda — events (recurring ones expanded) and due tasks in one answer |
| "Start a note for the Q4 report, then update just the status section." | create_note, update_note_section |
What Claude wrote shows up in the normal Nextcloud apps, immediately:
Features
- Tasks (VTODO): priorities, tags, reminders, subtasks, recurrence with exception dates, four-state status, batch update/delete/move.
- Calendars and events (VEVENT): recurring events, attendees and RSVP, free/busy, sharing, ICS import/export, birthdays, batch operations, trash bin.
- Timeboxing: turn a task into a calendar block and keep both linked.
- Notes: create, search, append, replace a passage or a single Markdown section.
- Combined day agenda: events and due tasks together.
- Safe by default: OAuth 2.1 with a password consent page,
https://enforced for Nextcloud, clean error messages instead of stack traces. - 51 tools in total, documented in the tool reference.
Compatibility
| Client | Status |
|---|---|
| Claude (claude.ai web) as a custom connector | Supported, connector and consent flow tested against claude.ai |
| Claude mobile and Cowork | Use the same connector as web; not tested separately |
Claude Desktop via mcp-remote | Documented in the deployment guide |
| Other MCP clients and model providers | Not tested yet, planned |
The server speaks standard Streamable HTTP MCP with OAuth 2.1 (Dynamic Client
Registration + PKCE), so other clients may work. The OAuth redirect allow-list
defaults to claude.ai and claude.com; other clients need
MCP_OAUTH_ALLOWED_REDIRECT_DOMAINS set. Reports from other clients are welcome.
Quick start
Requires Python 3.10+ and a Nextcloud with the Calendar/Tasks and Notes apps.
uv tool install nextcloud-organizer-mcp # or: pipx install nextcloud-organizer-mcp
Create an app password under Settings → Security → Devices & sessions (never your account password), then set:
export NEXTCLOUD_BASE_URL=https://cloud.example.com
export NEXTCLOUD_USERNAME=your-username
export NEXTCLOUD_APP_PASSWORD=your-app-password
export PUBLIC_BASE_URL=https://your-host.ts.net # the URL clients use
export MCP_OAUTH_PASSWORD=a-long-random-password # required unless local
nextcloud-organizer-mcp # listens on 127.0.0.1:8000, path /mcp
From a checkout instead: uv sync && cp .env.example .env, edit .env, then
uv run nextcloud-organizer-mcp. Every setting is documented in
.env.example. NEXTCLOUD_BASE_URL must be https:// unless it
points at a local address.
Then expose the server (the deployment guide uses Tailscale
Funnel for TLS) and add it in Claude under Settings → Connectors → Add custom
connector with the URL <PUBLIC_BASE_URL>/mcp. Leave Client ID and Secret blank
and enter your MCP_OAUTH_PASSWORD on the consent page that opens. Details:
Authentication.
How it works
Claude ── HTTPS + OAuth 2.1 ──► your server (this project) ── CalDAV / Notes API ──► Nextcloud
- One CalDAV connection is opened at startup and reused for every request.
- No tool or CalDAV logic runs until a request carries a valid access token.
- The server binds to a local HTTP port and does not handle TLS itself.
- Timestamps use
MCP_DEFAULT_TIMEZONE(defaultEurope/Berlin); naive inputs are interpreted in it.
Documentation
- Deployment guide — Ubuntu LXC + Tailscale + systemd + Claude connector setup
- Authentication — OAuth model, consent page, local security patches
- Tool reference — all tools with parameters, examples and error messages
- Architecture — module layout, request flow, design decisions
- Contributing — dev setup, checks, branches (
mainreleased,devactive) - Changelog · Security policy