lemma-describe

name	lemma-describe
description	Use for complex descriptive decompositions such as cohorts, funnels, segment comparisons, and what-changed investigations. Skip bounded lookups, joins, rankings, counts, averages, and aggregates.

Describe and answer

When to use

Use this skill when a descriptive question needs a multi-step decomposition or competing explanations. The root contract covers bounded calculations.

Deliver

Return the requested number, list, table, or diagnostic with its observation unit or denominator, population, and time boundary. Put the complete result in chat and stop when it and its material caveats are supported.

Check

• Confirm the relevant schema, units, grain, and definitions from the source.
• Check duplicates, missing values, and denominator changes that could alter the result.
• For comparisons, align populations and periods. For changes, distinguish volume from rate or mix.
• Test one alternative interpretation when wording or semantics are ambiguous.

Use lemma-wrangle only when a reconciliation conflict prevents calculation. Do not fit a model or imply causality from a slice.

For complex decompositions, read references/deep-guide.md.