# Llms Txt Checker

> Validates llms.txt files for AI agent discoverability. Checks structure, format, required fields, and best practices per ai-visibility.org.uk specification. Use when auditing or validating llms.txt files.

- Skill: `spirizeon/llms-txt-checker` (Agent Skill)
- Install (CLI): `npx skillmds@latest add spirizeon/llms-txt-checker`
- Raw SKILL.md: https://api.skillmd.com/api/skills/spirizeon/llms-txt-checker/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: Spirizeon (https://skillmd.com/u/spirizeon)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/spirizeon/llms-txt-checker

---


# llms.txt Checker Skill

Validates llms.txt files against the specification.

## When to Use This Skill

- Validate existing llms.txt
- Check website has proper llms.txt
- Audit structure and content

## Required Elements

| Element | Format |
|----------|--------|
| H1 Title | `# Project Name` |
| Blockquote | `> Brief summary` |
| Absolute URLs | `https://...` |

## Validation Checks

- H1 heading present
- Blockquote present
- Description present
- All URLs absolute
- No marketing hyperbole
- File under 10KB

## Usage

```bash
# Check domain
python3 scripts/llms_txt_checker.py example.com

# Check specific file
python3 scripts/llms_txt_checker.py --file /path/to/llms.txt
```