Get platform composer rules

GET 
/platform-rules

Server-authoritative composer rules for every supported platform: character limits, image/video constraints, and feature support (threads, carousels, reels, alt text). Check before composing for an unfamiliar platform — limits span 300 characters (Bluesky) to 63,206 (Facebook), and some constraints are enforced platform-side only. Served with an ETag; a newly supported platform appears here with no client update. Live since 2026-08-17.

Responses

200

Map of platform → rules

401

Missing/invalid/revoked/expired API key (codes invalid_api_key, api_key_revoked, api_key_expired, api_key_required, auth_failed). Auth-layer 401s omit error.retryable and meta.request_id.

500

Internal error (internal_error and endpoint-specific 5xx codes). Retryable.