{"platforms":{"tiktok":{"canPost":true,"note":"video.publish granted"},"facebook":{"canPost":true,"note":"Page feed / photos / videos via Graph"},"instagram":{"canPost":true,"note":"Needs public media_url (Graph container publish)"},"linkedin":{"canPost":true,"note":"Composio; set LINKEDIN_AUTHOR_URN if author resolve fails"},"youtube":{"canPost":true,"note":"Composio YOUTUBE_UPLOAD_VIDEO; needs public video URL"},"x":{"canPost":false,"note":"No user write token"}}}