domain

name	domain
description	Cook a plan against the project's domain model. Stress-tests terminology, surfaces contradictions with code, and updates CONTEXT.md, UBIQUITOUS_LANGUAGE.md, and ADRs inline as decisions crystallize. Use when planning a feature, refactoring, or any work that touches domain boundaries.
user-invocable	true
argument-hint	[plan or topic to stress-test]

Domain Model Cooking Session

Interview relentlessly about every aspect of this plan until we reach a shared understanding. Walk down each branch of the design tree, resolving dependencies between decisions one-by-one. For each question, provide your recommended answer.

Ask questions one at a time, waiting for feedback before continuing.

If a question can be answered by exploring the codebase, explore the codebase instead of asking.

Discover project context

Before starting, find and read existing domain documentation. Check these locations (in order):

1. docs/CONTEXT_MAP.md — if it exists, this is a multi-context project. Read it to understand bounded contexts and their relationships.
2. docs/UBIQUITOUS_LANGUAGE.md — the shared glossary. Read it to understand canonical terms.
3. docs/contexts/*/CONTEXT.md — per-context documentation. Read the ones relevant to the current plan.
4. CLAUDE.md — project-level context.

If none of these exist, that's fine — create them lazily as decisions are made (see below).

During the session

Identify which context(s) this plan touches

If a context map exists, determine which bounded context(s) the plan falls within. If the plan spans multiple contexts, call that out explicitly — cross-context work needs extra care around contracts and shared kernels.

Challenge against the glossary

When the user uses a term that conflicts with the ubiquitous language, call it out immediately:

"Your glossary defines 'change' as a persisted set of DOM mutations (ChangeSpec). You're using 'change' to mean something different here — which meaning do you intend?"

Sharpen fuzzy language

When the user uses vague or overloaded terms, propose a precise canonical term:

"You're saying 'user data' — do you mean the Visitor (anonymous deviceId), the Profile (identified via identify()), or the Member (org membership)? Those are three different concepts."

Discuss concrete scenarios

When domain relationships are discussed, stress-test them with specific scenarios. Invent edge cases that probe boundaries:

"What happens when an experiment is running on /pricing and someone deploys a change spec to the same page? Do they conflict? Which takes priority?"

Cross-reference with code

When the user states how something works, verify against the code. If you find a contradiction, surface it:

"You said goals are hard-deleted, but the code sets isActive = false — which is the intended behavior?"

Update documentation inline

When a term is resolved or a decision is made, update the relevant file immediately. Don't batch these up.

For terminology changes:

• Update docs/UBIQUITOUS_LANGUAGE.md with the new or refined term
• Update the relevant docs/contexts/<name>/CONTEXT.md if the term is context-specific

For domain model changes:

• Update the relevant CONTEXT.md with new invariants, contracts, or ownership changes
• Update docs/CONTEXT_MAP.md if relationships between contexts changed

For decisions:

• Only create an ADR when ALL THREE conditions are met:
  1. Hard to reverse — the cost of changing your mind later is meaningful
  2. Surprising without context — a future reader will wonder "why did they do it this way?"
  3. Result of a real trade-off — there were genuine alternatives and you picked one for specific reasons
• ADRs go in docs/contexts/<name>/adrs/ (context-specific) or docs/adrs/ (cross-context)
• Use sequential numbering: 001-slug.md
• Keep ADRs minimal: title + 1-3 sentences (context, decision, why). Optional sections (considered options, consequences) only when they add genuine value.

Lazy file creation

If documentation files don't exist yet, create them only when you have something to write:

• First term resolved → create UBIQUITOUS_LANGUAGE.md
• First context-specific decision → create that context's CONTEXT.md
• First cross-context relationship → create CONTEXT_MAP.md
• First ADR-worthy decision → create the adrs/ directory and first ADR

Related skills

• /spec — after cooking, formalize the plan into a spec
• /holistic — zoom out to understand how this plan fits the bigger picture
• /architect — surface architectural friction and design deep module interfaces