LLMs.txt Skill

A portable agent skill for generating concise, curated llms.txt files for websites.

The goal is maximum useful coverage with minimum links. It does not turn a sitemap into another sitemap-shaped file.

What it does

Given a website, the skill:

Inspects the homepage, navigation, sitemap, and existing llms.txt when available
Finds high-value hub pages, documentation, projects, guides, and core content
Prefers pages that provide broad coverage or unique context
Uses up to 20 high-value links, and often fewer
Avoids duplicate URLs, thin pages, pagination, tracking URLs, and exhaustive indexing
Produces a concise llms.txt

Example

Ask your agent:

Generate an llms.txt for https://hawando.com using the llms-txt skill.

The skill was tested against Hawando.com. Rather than listing every article and project, it selected a small set of pages that cover the site's main areas.

See examples/hawando.com-llms.txt for the generated result.

Install in Codex

This repository is also a Codex marketplace, so you can add it directly:

codex plugin marketplace add altsys/LLMs-txt-skill

Then browse the marketplace and install the llms-txt plugin. The marketplace catalog lives at .agents/plugins/marketplace.json.

After installation, ask Codex:

Generate an llms.txt for https://example.com using the llms-txt skill.

Portable plugin structure

plugin.json
skills/
  llms-txt/
    SKILL.md
.agents/
  plugins/
    marketplace.json
examples/
  hawando.com-llms.txt

The portable plugin manifest is plugin.json, and the reusable workflow lives in skills/llms-txt/SKILL.md.

Philosophy

A useful llms.txt should help an LLM understand and navigate a website without reproducing the entire sitemap.

Maximum useful coverage with minimum links.

License

MIT