# Post Kit Draft a post for each social platform, checked against its rules. It is free, with no sign-up and no key. ## What does Post Kit do? Turn a topic into posts that already fit each platform, write a 25-second video script for TikTok, YouTube Shorts, Instagram Reels or X video, adapt a post you wrote for another market, and make a short animated launch clip from your own product page. Ask "write posts about our new CLI for X, Bluesky and LinkedIn", "adapt this post for a Japanese audience" or "make a launch video from https://example.com/". The draft tool writes one post for each platform you name (x, bluesky, threads, mastodon, linkedin, instagram, reddit, youtube, pinterest, tiktok) and checks every draft against that platform's rules before returning it: length as the platform counts it (X weights links, emoji and CJK text, Bluesky counts graphemes, Threads counts emoji by bytes), hashtag limits, title length and link limits. A draft that breaks a rule is rewritten once; if it still breaks one, it is returned with the problem named. A checklist with image sizes and the rules' sources comes with every answer. The video script tool writes one short-form script on a fixed clock (hook at 0 to 3 seconds, body at 4 to 20 seconds, call to action by about 25 seconds) with a caption for each of tiktok, youtube_shorts, instagram_reels, x_video. It returns each platform's official video length limit with its source (TikTok 180 s, YouTube Shorts 180 s, Instagram Reels 1200 s, X video 140 s), checks the spoken words against the seconds each part has, and checks every caption against the platform's rules. Drafts and scripts are also checked for AI-content disclosure: when one declares an AI-generated person or voice, the answer names the label that applies on TikTok, YouTube, Instagram or X and links the platform's own policy. Post Kit does not write for persona farms, cloned voices of real people or fake-identity accounts, and it only flags: whether and how to label the video stays with the person posting. The localise tool adapts a post you wrote for another language and culture: tone, idioms, examples, units and formats, not a literal translation. It lists what it changed, and can check the result against a platform's limits. The launch video tool reads your product page once, honouring robots.txt, and returns a self-contained HTML and CSS animated clip of about 12 seconds: the product name, headline, description, up to three section headings and a call to action. It copies no images and runs no scripts. The TikTok slideshow tool turns one idea into 3 or 4 angles. Each angle is 5 slides (hook, pain, stake, reveal, call to action) as 1080x1920 PNG files, plus a caption and hashtags. Stake is the second pain beat. Copy uses the idea and fixed frames. Images are type and shapes, not photos. For a product or a new account, send your own lines for 3 or 4 angles instead: the slides then show only your lines, with no labels, ready to post, and an optional plan lays out the first 7 to 14 days of posts. One call is one plugin-call. A page at /slides shows the same result. Nothing is published or stored. The cover tool lays out a post cover as layers: a background, the subject, and the title as live text, never pixels. It returns the cover spec JSON with positions for Instagram 1080x1350 and X 1600x900 (or six more sizes), GPT image prompts that keep words out of the picture, an SVG per size, and a canvas link to move the title and export PNGs. Writing and adapting use a small free language model with a fixed daily allowance shared by all users, so at busy times a call may answer that the allowance is used up until 00:00 UTC; the rule checklist is still returned. Nothing is published for you, no account is read, and no post statistics or trends are fetched. Post Kit does not repost other people's content: use it for your own words and your own pages. The text you send is not stored; the only lasting record is a daily count of calls per tool. - Writes one post per platform, up to 6 at a time, for X, Bluesky, Threads, LinkedIn and more - Checks each draft against the platform's length, hashtag, title and link rules; rewrites one that breaks a rule - Counts length the way the platform does: X weighted characters, Bluesky graphemes, Threads emoji bytes - Returns a checklist with image sizes and the source of every rule, dated - Adapts a post you wrote for another language and culture, not a literal translation - Lists what changed for the new market and can check the result against a platform's limits - Writes a 25-second video script (hook 0-3 s, body 4-20 s, call to action by 25 s) with a caption per platform - Returns official video length limits for TikTok, YouTube Shorts, Instagram Reels and X video, each with its source - Flags drafts that declare an AI-generated person or voice and names the label that applies, with the platform policy - Builds a self-contained animated HTML launch clip from your own product page; honours robots.txt - Never publishes, reads accounts, fetches post statistics or trends, or stores your text - Makes 3 or 4 TikTok slideshows of 5 slides, each a 1080x1920 PNG, plus caption and hashtags - Draws your own slide lines for a product account and plans its first 7 to 14 days of posts - Lays out a post cover as layers (background, subject, live title text) for Instagram 1080x1350 and X 1600x900 - Writes structured GPT image prompts that keep words out of the picture and one account style on every cover - Links a canvas to move the title, scale the subject and export PNGs without a new picture ## Who it is for Anyone who asks an AI assistant a question like this one: “Write posts about our launch for X, Bluesky and LinkedIn.” Roles that use it at work: Founder. ## Price Post Kit is free to use. There is no sign-up, no account and no API key. Calls are limited to 60 calls a minute per network and 25000 calls a day per server, shared by all callers. Repeat questions are answered from a cache. ## Which tools does Post Kit offer? It has 6 tools. Your assistant picks the one that fits your question and calls it by name. - `draft_posts`: Draft posts for each platform - `draft_video_script`: Write a short-form video script - `localize_post`: Adapt a post for another market - `launch_video`: Make a launch video clip - `draft_tiktok_slides`: Make TikTok slideshows for one idea - `make_cover`: Make a layered post cover ## How do I connect Post Kit? The MCP server is `https://postkit.openkrill.app/mcp` (streamable HTTP). It needs no key. Claude Code, in one command: ``` claude mcp add --transport http postkit https://postkit.openkrill.app/mcp ``` Hermes Agent, in one command that answers its two setup questions (no key, enable all tools): ``` printf 'n\ny\n' | hermes mcp add postkit --url https://postkit.openkrill.app/mcp ``` Or add these lines to `~/.hermes/config.yaml`, under an existing `mcp_servers:` key if the file has one. Start a new Hermes session after either step. ``` mcp_servers: postkit: url: https://postkit.openkrill.app/mcp ``` Any other agent: give it this page's Markdown address, `https://tools.openkrill.app/tools/postkit.md`, and ask it to connect Post Kit. Paste the address into your assistant once: the [connect steps](https://tools.openkrill.app/#connect) cover Claude, ChatGPT and Cursor, and the [install guides](https://tools.openkrill.app/integrations) show the same steps for each client. ## How does Post Kit compare with other tools? We ran the same 5-input test on Post Kit and 2 other tools, and scored each answer by the rule on the comparison page. The times were taken in different ways, so compare them only roughly. | Tool | Right | Median time | | --- | --- | --- | | Post Kit (ours) | 5 of 5 | 14.2 s | | ChatGPT | 0 of 5 | 23.2 s | | Claude | 5 of 5 | 12.3 s | Source: [Social post drafting tools compared](https://tools.openkrill.app/compare/social-post-drafting-tools) and its [test data](https://tools.openkrill.app/compare/social-post-drafting-tools.json), checked 2026-10-13. ## Questions about Post Kit ### Is Post Kit free? Yes. Post Kit is free to use, with no sign-up, no account and no API key. ### What are the limits on Post Kit? Calls are limited to 60 calls a minute per network and 25000 calls a day per server, shared by all callers. ### How do I connect Post Kit to my AI assistant? Add https://postkit.openkrill.app/mcp to your AI assistant as a remote MCP server (streamable HTTP). It needs no key. ### Where does Post Kit get its data? Post Kit writes with a small free language model that has a fixed daily allowance shared by all users. It checks each draft against the platform's own rules and names their sources. It fetches no post statistics or trends. ### What does Post Kit not do? It publishes nothing for you and reads no account. When the daily allowance is used up, a call says so until 00:00 UTC and still returns the rule checklist. ## Job recipes for agents Step-by-step recipes that walk an agent through 3 jobs with this server's tools: - Draft posts for each platform, with `draft_posts` - Write a short-form video script, with `draft_video_script` - Adapt a post for another market, with `localize_post` [Download the recipes as SKILL.md](https://tools.openkrill.app/skills/postkit-jobs/SKILL.md). Save it as `postkit-jobs/SKILL.md` in your agent's skills folder. A connected MCP client gets the same recipes from `prompts/list` on this server. It is listed under Writing, media and files in the [full tool list](https://tools.openkrill.app/tools). The same facts in plain text are in [llms.txt](https://tools.openkrill.app/llms.txt). Source: the Post Kit listing, version 1.1.0. As of 2026-11-09.