PostOnce plugins for Claude Code

The Claude Code plugin marketplace for PostOnce's social media MCP servers. Each plugin connects your agent to one platform through its official API and adds the writing skills for that platform.

claude plugin marketplace add postoncehq/plugins
claude plugin install postonce@postoncehq

The first time you use a PostOnce tool, Claude Code asks you to sign in to PostOnce (or run /mcp and pick postonce). No API key needed.

Plugin	What it adds
postonce	Crosspost to all 9 platforms: post-everywhere, content calendar, hook vault and viral formats, plus the publishing workflow
linkedin-mcp	LinkedIn posts, carousels, formatting, headlines and profile copy
instagram-mcp	Instagram captions, carousels, Reel scripts, bios and hashtags
tiktok-mcp	TikTok scripts, hooks, captions and photo slideshows
youtube-mcp	YouTube titles, descriptions, tags, scripts, Shorts and thumbnails
facebook-mcp	Facebook Page posts, Reels and page copy
x-mcp	X (Twitter) posts, threads, formatting and bios
threads-mcp	Threads posts, crossposts and bios
bluesky-mcp	Bluesky posts, bios and custom domain handles
pinterest-mcp	Pinterest pins, descriptions, keywords, boards and blog-to-pins

Every plugin also includes a content calendar skill and the shared postonce publishing skill. Claude (claude.ai and desktop) and ChatGPT users don't need a plugin: add https://postonce.to/mcp as a custom connector instead. See PostOnce integrations.

License

MIT. See LICENSE.