Todoist API

Todoist API Skill

Interact with the Todoist REST API v2 via curl and jq.

Authentication

Resolve the API token in order:

1. Environment variable TODOIST_API_TOKEN
2. User-provided token in conversation
3. Ask the user (token is at: Todoist Settings → Integrations → Developer)

[ -n "$TODOIST_API_TOKEN" ] && echo "Token available" || echo "Token not set"

All requests use Bearer auth:

curl -s -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/ENDPOINT"

POST requests add Content-Type:

curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"key": "value"}' \
  "https://api.todoist.com/rest/v2/ENDPOINT"

Base URL

https://api.todoist.com/rest/v2/

Confirmation Requirement

Before executing any destructive action (DELETE, close, update, archive), ask the user for confirmation. A single confirmation covers a logical group of related actions.

Destructive: delete, close/complete, update, archive. Read-only (GET): no confirmation needed.

Priority Mapping

⚠️ The API and UI use inverted priority numbers:

When creating/updating tasks, use the API value (4 = urgent). When using filter queries, use the UI label (p1 = urgent).

Task Links (v2 IDs)

⚠️ The REST API url field uses deprecated numeric IDs. Todoist deprecated /app/task/<numeric_id> URLs (end of 2025). The new format uses alphanumeric v2 IDs.

New URL format: https://app.todoist.com/app/task/<v2_id>

The REST API v2 does NOT return v2_id. Use the Sync API v9 to get it:

Get v2_id for a single task

curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"item_id": "TASK_ID"}' \
  "https://api.todoist.com/sync/v9/items/get" | jq '.item.v2_id'

Works with both numeric IDs and v2_ids as input.

Get v2_ids for all tasks (bulk)

curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"sync_token": "*", "resource_types": ["items"]}' \
  "https://api.todoist.com/sync/v9/sync" | jq '[.items[] | {id, v2_id, content}]'

Build a task link

# After getting v2_id from Sync API:
TASK_ID="9971910530"
V2_ID=$(curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d "{\"item_id\": \"$TASK_ID\"}" \
  "https://api.todoist.com/sync/v9/items/get" | jq -r '.item.v2_id')
echo "https://app.todoist.com/app/task/$V2_ID"

Efficient bulk pattern (REST + Sync combo)

When listing multiple tasks, do ONE Sync call for the v2_id map instead of N individual lookups:

# 1. Get tasks via REST API (for filtering)
TASKS=$(curl -s -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/tasks?filter=today")

# 2. Build v2_id lookup from Sync API (one call)
V2_MAP=$(curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"sync_token": "*", "resource_types": ["items"]}' \
  "https://api.todoist.com/sync/v9/sync" | jq '[.items[] | {(.id): .v2_id}] | add')

# 3. Merge: replace URLs with v2 format
echo "$TASKS" | jq --argjson map "$V2_MAP" '
  [.[] | . + {link: "https://app.todoist.com/app/task/\($map[.id])"}]
'

When presenting task links to the user, always use v2_id URLs. Never use the url field from the REST API directly.

Task Response Object

The REST API returns tasks with this structure:

{
  "id": "123456789",
  "content": "Task name",
  "description": "Additional details",
  "comment_count": 0,
  "is_completed": false,
  "order": 1,
  "priority": 1,
  "project_id": "987654321",
  "section_id": null,
  "parent_id": null,
  "labels": [],
  "creator_id": "111",
  "created_at": "2024-01-15T10:30:00.000000Z",
  "assignee_id": null,
  "assigner_id": null,
  "url": "https://app.todoist.com/app/task/123456789",
  "duration": null,
  "deadline": null,
  "due": {
    "date": "2024-01-20",
    "string": "every monday",
    "lang": "en",
    "is_recurring": true
  }
}

Note: The url field uses deprecated numeric IDs. See "Task Links (v2 IDs)" above for the correct URL format.

The due object

due is null if no due date is set.

The deadline field

A hard deadline separate from due. When both are set, due is the soft/scheduled date and deadline is the hard cutoff. Can be set via deadline_date (YYYY-MM-DD) or deadline_datetime (RFC3339) when creating/updating tasks.

Endpoints Reference

Tasks

Task filters (query params for GET /tasks):

• project_id — filter by project
• section_id — filter by section
• label — filter by label name
• filter — Todoist filter query (e.g. today, overdue). See references/filters.md

Task creation/update fields:

• content (required for creation) — task text
• description — additional details
• project_id, section_id, parent_id — organization
• priority — 1 (normal) to 4 (urgent). See Priority Mapping above
• due_string — natural language ("tomorrow", "every monday")
• due_date — YYYY-MM-DD
• due_datetime — RFC3339
• deadline_date — YYYY-MM-DD hard deadline
• deadline_datetime — RFC3339 hard deadline
• labels — array of label names
• assignee_id — for shared projects
• duration, duration_unit — estimated time

Projects

Project fields: name (required), parent_id, color (e.g. "berry_red", "blue"), is_favorite, view_style ("list" or "board")

Sections

Section fields: name (required), project_id (required for creation), order

Labels

Label fields: name (required), color, order, is_favorite

Comments

Comment query params: task_id or project_id (one required for listing) Comment fields: content (required, markdown supported), task_id or project_id (one required for creation)

Pagination

Most REST v2 endpoints (tasks, projects, sections, labels) return flat JSON arrays — no pagination needed.

Pagination with cursors applies only to specific endpoints like completed tasks (API v1). See references/completed-tasks.md for the cursor-based pagination pattern.

Common Patterns

Create a task with due date

curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"content": "Buy milk", "due_string": "tomorrow", "priority": 4}' \
  "https://api.todoist.com/rest/v2/tasks"

Note: priority: 4 = urgent (P1 in UI).

Get today's tasks

curl -s -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/tasks?filter=today" | jq '.'

Get overdue tasks

curl -s -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/tasks?filter=overdue" | jq '.'

Complete a task

curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/tasks/TASK_ID/close"

List all tasks in a project

curl -s -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/tasks?project_id=PROJECT_ID" | jq '.'

Error Handling

response=$(curl -s -w "\n%{http_code}" \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  "https://api.todoist.com/rest/v2/tasks")

http_code=$(echo "$response" | tail -1)
body=$(echo "$response" | sed '$d')

if [ "$http_code" -ge 200 ] && [ "$http_code" -lt 300 ]; then
  echo "$body" | jq '.'
else
  echo "Error: HTTP $http_code"
  echo "$body"
fi

Idempotency

For safe retries on writes, include X-Request-Id (max 36 chars):

curl -s -X POST \
  -H "Authorization: Bearer $TODOIST_API_TOKEN" \
  -H "Content-Type: application/json" \
  -H "X-Request-Id: $(uuidgen)" \
  -d '{"content": "New task"}' \
  "https://api.todoist.com/rest/v2/tasks"

Completed Tasks

REST v2 /tasks returns only active tasks. For completed task history, see references/completed-tasks.md.

Additional Reference

• references/completed-tasks.md — completed task history (API v1 endpoints, cursor pagination)
• references/filters.md — Todoist filter query syntax

Source: aneym/agent-skills — distributed by TomeVault.