Design Exploration

Turn ideas into fully-formed designs through collaborative dialogue before writing code.

The Iron Law

NO IMPLEMENTATION WITHOUT DESIGN AGREEMENT FIRST

If you haven't validated the design, you cannot write production code.

When to Use

• MUST: Before creating new features
• MUST: Before building new components
• MUST: Before significant behavior changes
• SHOULD: Before complex refactoring
• SHOULD: When requirements are ambiguous

The Process

Phase 1: Understand Context

• MUST: Check current project state (files, docs, recent commits)
• MUST: Understand what exists before proposing changes
• SHOULD: Review related code to understand patterns

Phase 2: Clarify Intent

• MUST: Ask questions one at a time (not multiple questions per message)
• MUST: Prefer multiple choice when possible
• MUST: Focus on: purpose, constraints, success criteria
• NEVER: Assume requirements without asking
• NEVER: Skip clarification because "it seems obvious"

Phase 3: Explore Approaches

• MUST: Propose 2-3 different approaches with trade-offs
• MUST: Lead with your recommendation and explain why
• SHOULD: Present trade-offs: complexity, performance, maintainability
• NEVER: Present only one option

Phase 4: Present Design

• MUST: Break design into sections (200-300 words each)
• MUST: Ask after each section if it looks right
• MUST: Cover: architecture, components, data flow, error handling, testing
• SHOULD: Be ready to backtrack and clarify
• NEVER: Present entire design in one massive dump

Phase 5: Document and Proceed

• MUST: Write validated design to docs/plans/YYYY-MM-DD-<topic>-design.md
• MUST: Commit the design document
• SHOULD: Ask "Ready to set up for implementation?"

Question Patterns

Good: Multiple Choice

How should we handle authentication?

1. JWT tokens (stateless, scalable)
2. Session cookies (simpler, server-managed)
3. OAuth delegation (external provider)

Which fits your needs?

Good: Focused Open-Ended

What should happen when a user's session expires mid-operation?

Bad: Multiple Questions

What auth method? How should errors be handled? What about rate limiting?

Bad: Leading Questions

You want JWT tokens, right?

YAGNI Ruthlessly

• MUST: Remove unnecessary features from all designs
• MUST: Challenge "nice to have" features
• SHOULD: Ask "Do we need this for v1?"
• NEVER: Add features "while we're at it"
• NEVER: Design for hypothetical future requirements

Design Document Template

# [Feature Name] Design

**Goal:** [One sentence]

**Constraints:**
- [List constraints]

## Architecture

[2-3 sentences + diagram if helpful]

## Components

### [Component 1]
- Purpose:
- Inputs:
- Outputs:
- Error cases:

## Data Flow

[Sequence or flow description]

## Error Handling

| Error | Response |
|-------|----------|
| ... | ... |

## Testing Strategy

- Unit: [what]
- Integration: [what]
- Edge cases: [list]

## Open Questions

- [ ] [Any unresolved decisions]

Red Flags - STOP

If you catch yourself:

• Starting to write code before design is validated
• Presenting entire design at once
• Asking multiple questions in one message
• Not offering alternative approaches
• Adding features "just in case"

STOP. Return to the appropriate phase.

Integration