Tell your agent which video to post. It finds the file, transcribes it, writes the caption, and publishes to every platform you connect. Setup takes about five minutes, and the whole skill is on this page for you to copy.
The Problem: You Film Once And Post Five Times
You shoot one video. Then you post it five times.
Upload to TikTok, rewrite the caption, switch apps. Upload to Instagram, rewrite again. Then YouTube, X, LinkedIn. By the fourth platform you are worn down, and by the fifth, half your videos never go out. They sit on your drive while you tell yourself you will get to them.
Distribution is where content dies for most business owners. Not the filming, the posting. The good take is finished and saved, and the only reason it never reached anyone is that reposting it by hand five times felt like a chore you would rather skip.
This skill deletes the chore. You point your agent at the video. It handles the rest.
What Is Zernio?
Zernio is the bridge between your agent and your social accounts. You connect TikTok, Instagram, YouTube, X, and LinkedIn once inside Zernio, create one API key, and your agent posts to all of them through that single key. The free account covers the connection and the key. That is the only outside piece you need.
Copy The Skill
Here is the whole thing. It runs in any coding agent. Claude Code, Claude Desktop, or Codex. Paste it in and fill in two fields.
Copy this.
--- name: social-auto-poster description: Post a video to all your connected social platforms with one instruction. Finds the video file, transcribes it, writes a caption, and publishes everywhere via Zernio. --- # Social Auto-Poster > What this does, in one line: tell your agent which video to publish, and it transcribes it, writes a caption, and posts it across every connected social account, from one message. ## BEFORE YOU START: fill these in These are the only things you need to provide. Everything else is automatic. | Fill in | What it is | Example | |---|---|---| | ZERNIO_API_KEY | Your Zernio API key (free account at zernio.com, then API Keys, then Create new key) | zrn_live_a1b2c3… | | VIDEO_FOLDER | The folder your finished videos land in | ~/Downloads | > If you don't have a Zernio key yet, the skill stops on the first run and points you to zernio.com, Connections (sign in to your socials), then API Keys. ## What you need installed - A coding agent (Claude Code, Claude Desktop, or Codex) that runs this skill. - A free Zernio account (zernio.com) with your social accounts connected under Connections. ## How to use it 1. Put this file where your agent looks for skills (a skills/social-auto-poster/ folder), or paste the whole file into a new chat and say "follow this skill". 2. Fill in the two fields above. 3. Then tell your agent: "Post the newest video in my video folder to TikTok and Instagram." ## The workflow (what the agent does) 1. Find the video. Look in VIDEO_FOLDER for the video the user named, or the most recent file if they said "the newest one". Confirm the exact file before posting. 2. First-run setup, once. If Zernio isn't connected: tell the user to go to zernio.com, Connections, and sign into each social account, then zernio.com, API Keys, create a key and paste it as ZERNIO_API_KEY. Verify the key works by listing their connected accounts. 3. Transcribe. Generate a transcript of the video to use as caption source material. 4. Write the caption. Draft a short caption from the transcript. Hook first line, plain language, no filler. Show it to the user for a quick yes before posting. 5. Publish. Send the video and caption to Zernio, targeting the platforms the user named, or all connected platforms if they said "everywhere". Use the user's ZERNIO_API_KEY. 6. Confirm. Report back which platforms it posted to, with the live links. ## If something goes wrong - "No connected accounts": the social accounts aren't linked in Zernio yet. Go to zernio.com, Connections, and sign in to each one. - "Invalid API key": regenerate the key at zernio.com, API Keys, and update ZERNIO_API_KEY. - Wrong video picked: name the exact filename instead of "the newest one". - Caption is off: tell the agent the angle you want. It rewrites before posting.
How To Use It
Save that file where your agent looks for skills, then fill in your Zernio key and the folder your finished videos land in. Connect your accounts once inside Zernio, and you never touch that step again. From then on you write one line, like "post the newest video in my downloads folder to TikTok and Instagram", and walk away.
What You Get Back
01. The right video, confirmed. It names the exact file before it posts, so you never publish the wrong take. Say the filename when you care, or "the newest one" when you trust the folder.
02. A caption written from the video. It transcribes the audio and drafts a hook-first caption. You read it and approve before anything goes live.
03. Every platform in one pass. TikTok, Instagram, YouTube, X, LinkedIn. Whatever you connected, all of it at once.
04. The format adapted per platform. The post gets shaped for where it lands, not copy-pasted identically everywhere.
05. Live links back. It reports which platforms it posted to, with the links, so you can open each one and check.
If the caption comes back wrong, you do not start over. Say: rewrite it, lead with the result, keep it under three lines. It redrafts and shows you again before it posts.
Honest: What This Will Not Do
It needs a free Zernio account with your socials connected. No connection, no post. That is a five-minute setup, done once.
The caption is drafted by AI. Read it before you approve. It writes from the transcript, so a video with no speech gives you a thin caption. Feed it the angle and it rewrites.
It posts what you point it at. "The newest one" grabs the most recent file in the folder, right or wrong. Name the exact filename when precision matters.
Your video and key pass through Zernio, a third-party tool. That is fine for public content you were going to post anyway. Know it before you wire in anything private.
And if you only ever post to one platform, you do not need this. The payoff is cross-platform. One upload, everywhere.
Do This Once
If you only do one thing this week, connect your accounts in Zernio and post one video with the skill. One. Watch it land on every platform from a single message.
If it is not for you, you spent ten minutes and a free signup. If it is, you just deleted the most boring hour of your week, and every video you finish from now on gets seen instead of stuck in a folder.