modelith

Build or update a domain model by conversation. Use when the user wants to add or change an entity, relationship, attribute, action, invariant, or scenario in a *.modelith.yaml file, or describes product concepts they want captured in the model. Drafts the YAML, asks clarifying questions where a definition is fuzzy, runs the linter, and regenerates the committed Markdown. For a read-only check that explains findings without editing, use domain-model-lint instead.

Load a domain model into the working context before a coding task. Use at the start of a session that will touch product concepts, when the user says "use the domain model" or "load the model," or before implementing a feature in a repo that has a *.modelith.yaml. Makes the agent reason in the team's vocabulary — entity names, relationships, and invariants.

Run modelith lint on a domain model and explain the findings — a read-only review pass. Use when the user asks to check, validate, or review a *.modelith.yaml file, or wants to know what is missing or inconsistent. Turns the linter output into a prioritized, actionable summary. To actually change the model (add or edit entities, fix the gaps), use domain-model-author.