> For the complete documentation index, see [llms.txt](https://docs.kula.digital/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kula.digital/skills/library.md).

# The built-in library

Every studio starts with a curated set of **free** skills we build and keep up to date. You don't install them — they're already there the moment your data is connected, and you'll find them in your **Skills** page.

## What ships free today

* **At-Risk Members** — finds members whose attendance has quietly slipped and ranks who's worth a personal check-in this week.
* **Retention Cohorts** — for your recurring (subscription) memberships, tracks how each join cohort holds on over time, calls out where the drop-off cliffs are, and renders it as an interactive retention report you can open and explore.
* **Data Health** — tells you at a glance whether your studio's data is current, which connectors are behind, and what to do about it — so you can trust the answers the other skills give you.
* **Eval Runner** — a behind-the-scenes skill that checks the quality of skills against known examples. Most owners never touch it directly; it's what keeps the others honest.

We add to and improve this free library over time — improvements arrive automatically, no action needed from you.

## How to run one

Just ask your AI assistant for it in plain English:

> *"Run the at-risk members skill for the last 30 days and draft outreach for the top five."*

> *"Show me membership retention cohorts by join month for the last year."*

You can also pick a skill from the list of ready prompts your assistant shows. Either way, answer any questions it asks along the way, and read what comes back.

## Make them yours

If you find yourself tweaking a built-in skill the same way every time — a particular time window, your own definition of "at risk", your studio's language — you can save *your* version. See [Build your own & share with your team](/skills/build-your-own.md).