prototype

Phase 1: Define the Question

Resolve the review mode (once, store for all gate spawns this run):

1. If --review [full|lean|solo] was passed → use that
2. Else read production/review-mode.txt → use that value
3. Else → default to lean

See .claude/docs/director-gates.md for the full check pattern.

Read the concept description from the argument. Identify the core question this prototype must answer. If the concept is vague, state the question explicitly before proceeding — a prototype without a clear question wastes time.

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Phase 2: Load Project Context

Read CLAUDE.md for project context and the current tech stack. Understand what engine, language, and frameworks are in use so the prototype is built with compatible tooling.

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Phase 3: Plan the Prototype

Define in 3-5 bullet points what the minimum viable prototype looks like:

• What is the core question?
• What is the absolute minimum code needed to answer it?
• What can be skipped (error handling, polish, architecture)?

Present this plan to the user before building. Ask for confirmation if scope seems unclear.

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Phase 4: Implement

Ask: "May I create the prototype directory at prototypes/[concept-name]/ and begin implementation?"

If yes, create the directory. Every file must begin with:

// PROTOTYPE - NOT FOR PRODUCTION
// Question: [Core question being tested]
// Date: [Current date]

Standards are intentionally relaxed:

• Hardcode values freely
• Use placeholder assets
• Skip error handling
• Use the simplest approach that works
• Copy code rather than importing from production

Run the prototype. Observe behavior. Collect any measurable data (frame times, interaction counts, feel assessments).

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Phase 5: Generate Prototype Report

Draft the report:

## Prototype Report: [Concept Name]

### Hypothesis
[What we expected to be true -- the question we set out to answer]

### Approach
[What we built, how long it took, what shortcuts we took]

### Result
[What actually happened -- specific observations, not opinions]

### Metrics
[Any measurable data collected during testing]
- Frame time: [if relevant]
- Feel assessment: [subjective but specific -- "response felt sluggish at
  200ms delay" not "felt bad"]
- Player action counts: [if relevant]
- Iteration count: [how many attempts to get it working]

### Recommendation: [PROCEED / PIVOT / KILL]

[One paragraph explaining the recommendation with evidence]

### If Proceeding
[What needs to change for a production-quality implementation]
- Architecture requirements
- Performance targets
- Scope adjustments from the original design
- Estimated production effort

### If Pivoting
[What alternative direction the results suggest]

### If Killing
[Why this concept does not work and what we should do instead]

### Lessons Learned
[Discoveries that affect other systems or future work]