# using-list-subsets

> Claude/Codex skill by [@gopigment](https://omgskills.com/library/gopigment/index.md) · 23 stars · Updated 2026-10-23

Execution skill. Use when creating, modifying, or reasoning about List Subsets — mirror dimensions, same-dimension-on-two-axes, cohort modeling, restricted dropdowns, iterative performance optimization, or any request involving subsets.

## Install

```sh
git clone https://github.com/gopigment/ai-plugins /tmp/ai-plugins && ln -s /tmp/ai-plugins/skills/using-list-subsets ~/.claude/skills/using-list-subsets
```

## From README

Using List Subsets A subset is a selected group of items from a parent dimension list, usable as its own dimension in metric structure. Use only when they deliver clear modeling or performance benefits. Subset Mental Model A subset behaves as a separate dimension in structures and formulas: Metrics dimensioned by the subset and by the parent are different shapes — not interchangeable without explicit mapping. Subsets inherit items, properties, order, and sharing behavior from the parent list. Deselecting an item from a subset permanently deletes associated datapoints in metrics dimensioned by that subset. Affects all scenarios; not reversed if re-added. Decision Checklist Go through these five gates before recommending a subset: Security or filtering goal? Use Access Rights or view filters/Boolean properties. Do not propose subsets. Smaller input list? If membership changes and there is no iterative/performance need, prefer a separate regular list.

## Links

- HTML page: https://omgskills.com/library/gopigment/ai-plugins/skills/using-list-subsets/
- GitHub: https://github.com/gopigment/ai-plugins
- Author: [@gopigment](https://omgskills.com/library/gopigment/index.md)

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