You built the product. Now someone has to write the homepage, fix the SEO, make the launch video and post on LinkedIn. These skill packs let your coding agent do that work, built on the product itself instead of generic templates.

We ranked the 8 most popular marketing packs by GitHub stars (October 2026) and ran most of them. Every SEO, copy and AI-search skill ran on the same real site, buttondown.com , a small newsletter platform. That way you can compare what each one found.

OpenMontage turns your agent into a video production team. You describe the video and it runs a pipeline: research, script, scenes, footage, voiceover, music, captions, edit. It stops for your approval at each creative step. A live board shows what's happening and what each step costs.

For a startup, the useful pipelines are:

This 60-second product film is one of the project's own demos, made from five product photos:

Use it when you need narrated or generated video. Generated footage costs money per clip: the project's demos ran from $1.33 to about $5 each. Without paid providers you still get a free voiceover and archive footage.

HyperFrames, from HeyGen, makes video from web pages. The agent builds each scene in HTML, so a launch video can use your real product screens instead of stock footage. That's the difference between a video about your product and a video about any product.

We made the Paralect Agent launch video with it, from the app's own screens:

For a smaller test, we gave it one paragraph describing a chart. Three minutes later we had a 12-second video, with no hand edits:

The three skills a startup will use:

Use it for every launch and every feature worth a post. The video is only as good as the screens and the brief you give it: a vague prompt gets a video like everyone else's.

humanizer strips the signs of AI writing from your text without changing what it says. It's built on Wikipedia's guide to spotting AI writing and checks 26 patterns: "it's not X, it's Y", "Let that sink in", "Here's the thing", hollow closing lines.

We gave it a typical AI blurb: "revolutionizes the way modern teams collaborate… It's not just a tool, it's a game-changer… Are you ready?" In 17 seconds it rewrote the blurb and listed every phrase it cut, and why.

The most useful part came at the end. The copy got short because the original had almost no facts, so it asked for the product's real integrations and insights. That's the actual problem with most AI copy, and the skill says so.

Use it on every piece of copy an agent writes for you. Give it two or three paragraphs of your own writing and it will match your voice.

Corey Haines' library of 50 skills is the most installed marketing pack on skills.sh. Describe your product, audience and positioning once, and every skill uses it. The ones to start with:

We ran seo-audit on paralect.com, and it changed our roadmap. It checked all 675 pages and found:

We shipped server rendering the next day.

Then we ran copywriting on Buttondown's homepage. In 27 seconds it pointed out that the headline asks a question ("Why is running a newsletter so hard?") the page never answers. It wrote three alternatives using only claims the site makes, and it refused to call the migration "free" because the site doesn't say so.

Start here. It has the widest coverage of any pack on this list.

claude-seo sends 11 specialist agents at your site at once: technical, content, schema, performance, mobile, AI search, backlinks and more. It merges what they find into one scored report. Before reporting, it re-checks its own most serious claims and drops the ones it can't reproduce.

On buttondown.com it took 3.5 minutes and about $2.60 of usage at API prices. The score was 70/100, and the findings were specific:

seo-audit or claude-seo? Use seo-audit while the basics are broken. Switch to claude-seo when the site is technically clean and the question is what to build next. It also gives you a 0–100 score and a week-by-week plan.

More people now ask ChatGPT or Perplexity "what's the best newsletter tool?" instead of Googling it. geo-seo-claude checks whether AI assistants can read, trust and quote your site. That means:

The quick check on buttondown.com took 44 seconds and estimated a score of about 68/100. What it found:

Use it once your Google basics are fixed. Each finding is a small fix that decides whether AI quotes your price or a competitor's.

Twelve skills for LinkedIn: posts, comments, replies, hooks, a content plan and profile fixes. They draft in your voice, and nothing gets published until you approve it.

We asked for a launch post for a Paralect Agent feature. In 33 seconds we had a full draft. It opens on a number, explains the old way and the new way, admits a limit, and ends with a question. The best part: it didn't make up numbers . It left a blank for the stat it didn't have, and a slot for one honest example of what's still rough.

Use it if LinkedIn is where your buyers are. Feed it a few of your past posts first, so it learns your voice.

Eric Siu runs the growth agency Single Grain. This pack is his playbook, written as Python scripts with a skill on top:

We tried the conversion audit on two sites, and it crashed on both. Treat it as working code to adapt, not something that runs out of the box. Most parts also need API keys for Search Console, Ahrefs and similar tools.

Use it if you have a developer who'll adapt it. Otherwise, marketingskills covers the same ground with no setup.