Vikunja Skill

Connects an OpenClaw agent to any Vikunja instance via its REST API (/api/v1). Uses an API token for authentication — no session management needed.

Configuration (required env vars)

The agent must confirm both vars are set before making any request. If missing, tell the user exactly which var is absent and where to create the token (Settings → API Tokens in the Vikunja web UI).

Important API conventions

Vikunja uses non-standard HTTP verbs:

• PUT = create a new resource
• POST = update an existing resource
• GET = read / list
• DELETE = delete

All requests:

• Header: Authorization: Bearer <VIKUNJA_API_TOKEN>
• Header: Content-Type: application/json
• Base: ${VIKUNJA_BASE_URL}/api/v1

Paginated list endpoints accept ?page=N&per_page=50&s=<search>. Response headers x-pagination-total-pages and x-pagination-result-count tell you if more pages exist.

Supported operations

See references/endpoints.md for the full endpoint reference.

Projects

• List all projects the user has access to
• Create a new project
• Get a single project by ID

Tasks

• List tasks (all, or filtered by project)
• Get a single task by ID
• Create a task in a project
• Update a task (title, description, priority, due date, percent done)
• Mark a task as done ("done": true)
• Delete a task

Labels

• List all available labels
• Create a label
• Add a label to a task
• Remove a label from a task

Assignees

• Add a user as assignee to a task
• Remove an assignee from a task
• List task assignees

Reminders

• Add a reminder to a task (absolute datetime or relative offset)
• Remove a reminder from a task
• Reminders are part of the task object — use the task update flow

Task Relations

• Create a relation between two tasks (precedes, follows, blocked_by, subtask, etc.)
• Delete a relation
• When creating a new task with a known relation, use related_tasks inline in the body — no separate call needed
• When adding relations to already-existing tasks, use PUT /tasks/{id}/relations

Workflow guidelines

1. Resolve names to IDs first. If the user says "add a task to my Work project", list projects and find the ID for "Work" before creating the task.
2. Confirm destructive actions. Before deleting a task or project, confirm with the user.
3. Show structured output. When listing tasks, present title, due date, priority, labels, and done status. Format dates in a human-readable way.
4. Handle pagination. If x-pagination-total-pages > 1, fetch subsequent pages or inform the user that results are truncated.
5. Error handling. On HTTP 4xx/5xx, surface the message field from the JSON response to the user. On 401, remind them to check VIKUNJA_API_TOKEN.

Example interactions

• "What tasks are due this week?" → GET /tasks/all with filter, format results
• "Create a task 'Deploy new release' in my Homelab project due Friday" → resolve project ID, then PUT /projects/{id}/tasks
• "Mark task 42 as done" → POST /tasks/42 with {"done": true}
• "Add the 'urgent' label to task 17" → resolve label ID, PUT /tasks/17/labels
• "Assign me to task 5" → look up current user via GET /user, PUT /tasks/5/assignees
• "Set a reminder for task 8 in 2 hours" → compute absolute datetime, POST /tasks/8

Read references/endpoints.md for exact request/response shapes.