AI Product Index / llms.txt published

llms.txt published

It is the first file an arriving agent fetches after robots.txt, and the only one whose entire purpose is to tell a model what you are. Absent, the agent has to infer your site from HTML written for humans.

15
of 122 points
12.3%
of the total grade
2025
checklist generation

Does this apply to your site?

This check concerns site information and access. Consider your intended audience and publishing policy before making a change.

This score measures coverage of a published technical checklist. It does not measure AI visibility, referrals, content understanding or successful agent tasks. Optional service interfaces may not apply to your site; missing them still affects this fixed checklist.

How to address it when relevant

Publish /llms.txt: an H1 with the site name, a > blockquote summary, then linked sections of the pages agents should read.

Example to adapt

Replace {{ORIGIN}} with your own origin — or call the paid endpoint, which substitutes it for you and tells you which checks failed. Review all placeholder names, paths, prices and capabilities before publishing; origin substitution does not verify them.

# /llms.txt  — publish at {{ORIGIN}}/llms.txt

# Your Product Name

> One sentence on what this is and who it is for.

## Docs
- [Getting started]({{ORIGIN}}/docs/start): what it says on the tin.
- [API reference]({{ORIGIN}}/docs/api): endpoints, auth, limits.

## Contact
- [Email](mailto:you@example.com)

Check your own site

Free, no signup, same endpoint that produced every grade on the leaderboard:

curl "https://index.percall.dev/api/score?url=https://your-site.example"

It returns the letter grade and every check by name with pass/fail. The $0.05 call at POST /api/audit adds why each one failed and a snippet with your origin already in it.

The rest of the checklist

12 more 2025 checks, and 7 from the other generation.