Trello API
Trello's REST API for managing boards, lists, cards, members, and attachments in Trello's visual kanban-style project management platform.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
OAuth1 and API key+token auth. Atlassian-owned. SOC2, ISO27001. API key has broad access — use OAuth for user-scoped access in multi-user scenarios. Rate limits not well-documented.
⚡ Reliability
Best When
An agent needs to manage a simple kanban workflow in Trello, particularly for creating cards and moving them through columns.
Avoid When
You need complex project management features, team reporting, or are managing large projects with many dependencies.
Use Cases
- • Creating and moving cards between lists from agent workflows
- • Reading board state for automated status reporting
- • Adding labels and due dates to cards via automation
- • Creating cards from external events (emails, webhooks, etc.)
- • Archiving completed cards and managing board cleanup
Not For
- • Complex project management with dependencies and timelines (use Asana/Jira)
- • Large team coordination with advanced workflow automation
- • Agile sprint management (use Jira instead)
- • Teams needing Gantt charts or advanced reporting
Interface
Authentication
API key + token pair for authentication. Key from developer console, token generated via OAuth flow or manually. Simple and agent-friendly. Tokens can be read-only or read-write.
Pricing
Free plan is very capable for basic Trello use. API access on all plans. Premium adds views like Calendar and Timeline.
Agent Metadata
Known Gotchas
- ⚠ No official SDK — agents must use raw HTTP
- ⚠ Authentication requires both API key AND token as query parameters
- ⚠ Webhook registration requires publicly accessible callback URL
- ⚠ Some endpoints return HTML error pages instead of JSON on certain errors
- ⚠ Card attachments require multipart form upload — complex for agents
- ⚠ No pagination on some list endpoints — large boards return all cards at once
Alternatives
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Scores are editorial opinions as of 2026-03-07.