# Get per-platform composer rules with the PostEverywhere API

**Source:** https://posteverywhere.ai/docs/api/get-platform-rules

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# Get per-platform composer rules with the PostEverywhere API

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.

Guide: [Media requirements by platform](https://posteverywhere.ai/docs/media-requirements)

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## Responses

- 200Map of platform → rules
- 401
- 500
[← All endpoints](https://posteverywhere.ai/docs/api/reference)