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PostMCP/ai

Write, schedule and publish

The composer writes one post per selected profile, so each delivery can be edited, retried or cancelled on its own. What you see in the queue is that list.

On this page
  1. The composer
  2. Media limits
  3. Carousels
  4. Managing the queue
  5. Calendar
  6. What a post costs

The composer

  1. 1
    Open Write Post and select target profiles
    Connected profiles appear as chips. Select every profile that should receive the post. Nothing is sent to profiles you leave unselected.
  2. 2
    Write the copy
    One text is shared across networks by default. Character limits are checked per network before you publish, and you can have AI write a native draft per network or generate an image inside the composer.
  3. 3
    Attach media
    Upload an image or video, paste a hosted URL, or generate an image with AI. Add more images to publish a carousel — drag the thumbnails to set the order. Limits are listed below.
  4. 4
    Choose Continue to Schedule
    Then either Publish Immediately or pick a date and time and choose Schedule Broadcast.

Media limits

Images can be up to 25 MB on every network. Video limits follow each network:

Video size and duration limits per network
NetworkMax sizeMax duration
X (Twitter)512 MB2 min 20 s
YouTube Shorts256 MB3 min
LinkedIn200 MB30 min
Bluesky50 MB60 s
Facebook, Instagram, Threads50 MBNetwork limit applies

Carousels

Attach more than one file and the post goes out as a carousel on Instagram and Threads, a multi-photo post on Facebook and LinkedIn, and a gallery of up to four on X and Bluesky. The first file is the cover and the order you set is the order the network shows. Through the API and MCP tools, pass the set as mediaUrls.

How many files each network takes in one post
NetworkFiles per postVideo among several?Publishes as
Instagram2–10YesCarousel
Threads2–20YesCarousel
FacebookUp to 10NoMulti-photo post
LinkedInUp to 20NoMulti-image post
X (Twitter)Up to 4NoGallery on one post
BlueskyUp to 4NoGallery on one post
YouTube Shorts1—One video per upload

Managing the queue

All Posts lists every post with Scheduled, Published and Failed filters. From a post card you can:

  • Edit: change copy, media, targets or the scheduled time before it goes out.
  • Publish Immediately: send a scheduled post now, or retry a failed one. Profiles that already received it are skipped.
  • Cancel: remove a scheduled post from the queue. Nothing is charged.
  • Release: free a post stuck mid-publish so it can be retried. Use this only if a post has shown as publishing for several minutes.

Removing a post that already published deletes your record of it. The post stays live on the network; delete it there if you need it gone.

Calendar

Calendar shows the same posts by month, week or day. Press M, W or D to switch views. Drag a scheduled post to a new slot to reschedule it; published posts are locked in place.

What a post costs

Publishing spends credits from the workspace owner’s balance. Each profile a post is delivered to costs one credit, except X, which costs five. A post whose text contains a link carries a one-off surcharge of 50 credits. The composer shows the total before you confirm, and the preflight_post MCP tool reports it to an AI client. Drafts, cancelled posts and failed deliveries are not charged.