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domain-modeling

Build a project's domain model — challenge terms, pin down a ubiquitous language, write the glossary down. Use when defining domain terminology, naming a concept, resolving terms used inconsistently, or updating the glossary. Don't use for a single architectural decision (/to-adr) or explaining code (/zoom-out).

skills/domain-modeling/SKILL.md

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# Domain Modeling

The *active* discipline of shaping the model — challenging terms, inventing edge-case scenarios, and writing vocabulary down the moment it crystallizes. Merely *reading* a glossary for vocabulary is a one-line habit any skill does; this skill is for when you're changing the model, not consuming it.

## Artifact

Maintain the project's glossary in its existing convention; a legacy `CONTEXT.md` counts. If there is none, create `GLOSSARY.md` at the repo root. A repo with several bounded contexts gets one glossary per context, plus a root `GLOSSARY-MAP.md` that points to each. Call the Skill tool with `to-adr` to record decisions that settle a term, so the *why* is preserved separately from the *what*.

## Ubiquitous language

One term, one meaning, used everywhere — prose, code, docs, and the glossary agree. For each term write:

- A crisp definition.
- An **Avoid** list of the rejected synonyms, so the same concept never travels under two names.