PostFast — 11-Platform Social Media Scheduler

PostFast gives your agent a single API to schedule and automate posts across 11 social media platforms: TikTok, Instagram, Facebook, X (Twitter), YouTube, LinkedIn, Threads, Bluesky, Pinterest, Telegram, and Google Business Profile.

This skill covers the complete workflow agents need: discovering connected account IDs, scheduling text posts, handling the 3-step media upload flow (signed S3 URL → PUT → post), cross-posting to multiple platforms in one call, managing drafts, retrieving post analytics, and using platform-specific controls (TikTok privacy, Instagram Reels, YouTube Shorts, LinkedIn document carousels, and more).

Includes 14 documented critical gotchas (the auth header alone trips up most first-time integrators), platform-specific controls reference, media size limits by platform, and rate limit guidance including the 5-post/day X API cap.

Ideal for agents that need autonomous social media presence — content bots, marketing automation, multi-channel campaign schedulers, and any agent that publishes content.