Trello Api

Trello's REST API is simple and well-documented — boards contain lists, lists contain cards, and cards are the primary data objects with labels, checklists, due dates, members, and attachments. For agents: create cards from product events (support ticket created, build failed), move cards between lists as status changes, add comments for audit trails, and query board state for reporting dashboards. Webhook subscriptions push card lifecycle events. Free tier covers all basic use cases. Confidence is docs-derived.

REST API at api.trello.com/1. Resources: boards, lists, cards, members, labels, checklists. GET /1/boards/{boardId} retrieves board details. GET /1/boards/{boardId}/lists retrieves lists. GET /1/boards/{boardId}/cards retrieves all cards. POST /1/cards creates a card ({idList, name, desc, due, idLabels, idMembers}). GET /1/cards/{cardId} retrieves card details. PUT /1/cards/{cardId} updates card (idList to move between lists, name, desc, due, closed). POST /1/cards/{cardId}/actions/comments adds comment ({text}). GET /1/boards/{boardId}/members retrieves board members. POST /1/webhooks creates webhook ({callbackURL, idModel: boardId, description}). Checklist: POST /1/checklists creates checklist; POST /1/checklists/{id}/checkItems adds item.

API key + token auth: append ?key={api_key}&token={user_token} to all requests. API key from trello.com/app-key. User token: OAuth1 flow (GET https://trello.com/1/authorize?expiration=never&scope=read,write&response_type=token&key={key}). HTTPS enforced. No OAuth2. Webhook auth: Trello sends a Content-Type: application/json POST — implement signature validation via x-trello-webhook header (HMAC-SHA256). Power-Ups (Trello apps): separate OAuth2 flow for third-party apps.

Standard HTTP status codes with plain-text or JSON error messages. 401 for invalid API key or token. 404 for unknown board/list/card ID. Webhook delivery: Trello retries on failure. Card move: update idList with target list ID. List order: pos field (float) controls card ordering within list. Due dates: ISO 8601 string in due field. Label colors: limited set (green, yellow, orange, red, purple, blue, sky, lime, pink, black). Trello uptime at trello.status.atlassian.com. Rate limiting: 300 req/10s per token (standard).

developer.atlassian.com/cloud/trello covers REST API reference, webhook guide, and Power-Up development documentation. Getting started: create Trello account (free), get API key from trello.com/app-key, authorize token — first card creation in under 5 minutes. No official SDK — REST is simple for direct use. API documentation is straightforward. Community via Atlassian Developer Community and Stack Overflow (trello tag). Clean, simple API for Kanban workflow automation.