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PostOnce’s skills teach your AI assistant to write posts that fit each platform, plan a content calendar, write hooks and pick video formats. They’re free and open source on GitHub. Installing a skill only adds instructions. To publish, also connect your assistant to PostOnce.

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The skills

hook-vault and viral-formats work without a PostOnce account. You can also browse the same libraries on the web: Hook vault and Viral formats.

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Install

Install the PostOnce plugin. It adds all five skills and the PostOnce connection.
  1. Create an API key in Settings › API keys and make it available to Claude Code as the POSTONCE_API_KEY environment variable. API keys need a paid plan (Connect an AI assistant).
  2. Install the plugin:
  1. Restart Claude Code and ask: “Show my connected PostOnce accounts.”
Step-by-step, including how to check for an existing PostOnce setup: Claude Code integration.

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How they work together

1

Pick a format

“Give me 3 video ideas for my bakery that I can film on my phone.” viral-formats suggests formats with real examples and scripts the one you choose.
2

Write the hook

“Write 3 hooks for this video.” hook-vault fills proven templates with your details and shows the post each one came from.
3

Post it everywhere

“Post this to all my accounts tomorrow at 9am.” post-everywhere writes a version for each platform and schedules them through PostOnce.
4

Plan the next weeks

“Plan 2 weeks of posts from my last 3 blog posts.” content-calendar drafts and schedules the run.
Ask for a draft first if you want to check posts before they go out. Drafts appear in Posts › Drafts.

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Platform plugins

For deeper writing help on one platform, such as carousels, video scripts, X threads or YouTube thumbnails, see that platform’s plugin on GitHub under postoncehq.

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Questions

No. They’re free and MIT-licensed. Publishing needs a PostOnce account, which you can try free for 7 days without a card (Plans and billing).
Yes. Each skill is a folder with a SKILL.md file of plain instructions. Change it to match your voice or rules. If you installed the plugin, copy the skill into your own skills folder under a new name first, so plugin updates don’t overwrite your changes.
No. They run inside your assistant. Only posts you ask it to publish go to PostOnce and the platforms you choose.

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Still stuck?

Search this help center with ⌘ K, or email support@postonce.to from the address you use for PostOnce. Include the platform, the approximate time, and the exact message you saw. Never send passwords, access tokens, API keys, or card details. Something missing from PostOnce? Request a feature or check the roadmap.
Last modified on October 16, 2026