Primary limits (captions / post text)
Secondary limits (titles / descriptions)
Multi-platform posting
When posting to multiple platforms, each platform is validated independently. A caption valid for LinkedIn (3,000) may fail on Bluesky (300):422 for Bluesky even if LinkedIn would succeed.
Example: platform-specific text
default_text to 300 chars or add a shorter override in a pre-processing step.
Error format
Quick reference by use case
Related
Platforms overview
All eight platforms
HTTP errors
422 validation errors