/shape

Position in workflow:

1. superpowers:brainstorming → explores what, clarifies requirements
2. /shape (this) → applies patterns, defines right things to do
3. superpowers:writing-plans → detailed implementation steps

When invoked, execute this workflow. Do not skip phases.

Phase 1: Confirm Scope

If brainstorming already happened, summarize:

• Problem being solved
• What's in/out of scope
• Who can use this

If not, ask these questions before proceeding.

Phase 2: Discover Applicable Skills

Check each vanilla-rails skill. For each, state whether it applies:

Always apply:

• work-breakdown - How to split into PRs
• testing - Test patterns
• style - Code style conventions
• naming - Naming conventions

Apply if relevant:

• routing - Adding routes, nesting, namespaces?
• data-modeling - Adding tables, migrations, schema decisions?
• delegated-types - 5+ content types comingling in feeds/timelines?
• models - Adding model behavior, state tracking, concerns?
• controllers - Adding endpoints, state changes, resources?
• views - ERB templates, partials, Turbo Streams?
• jobs - Background processing needed?
• hotwire - Dynamic UI updates?
• writing-affordances - 3+ related methods or prefix clusters?

Say: "These skills apply: [list]. Loading each to apply patterns."

Phase 3: Apply Patterns

For each applicable skill, invoke it and document the decision:

**data-modeling:** UUID primary key, account_id, state-as-records
**models:** State as records → `has_one :pin`, not `pinned: boolean`
**models:** Concern as adjective → `Card::Pinnable`
**controllers:** Resource extraction → `resource :pinning`
**naming:** Resource noun → `Pin` (create = pin, destroy = unpin)

Ask the user to confirm or adjust decisions.

Phase 4: Break Down Work

Using work-breakdown patterns, propose PRs:

PR 1: "Add pinning to cards" (migration + model + concern + tests) - 4 files
PR 2: "Add UI for pinning cards" (controller + views + tests) - 4 files
PR 3: "Sort pinned cards first" (scope + view + tests) - 3 files

Check: Does any PR title have "and"? Split it.

Phase 5: Output Shaping Document

Write to docs/shaping/YYYY-MM-DD-feature-name.md:

# [Feature] Shaping

## Scope
- Problem: [what problem this solves]
- In scope: [list]
- Out of scope: [list]
- Users: [who can use this]

## Pattern Decisions
[from Phase 3 - which skills applied and how]

## PRs
[from Phase 4 - ordered list of PRs with file counts]

## Open Questions
[any unresolved items]

Phase 6: Handoff to Planning

Ask: "Ready to create implementation plan?"

If yes, invoke superpowers:writing-plans with the shaping document as context.

The writing-plans skill will create detailed, step-by-step implementation tasks for each PR.

Skill Reference

Remember: This is a command. Execute each phase in order. Do not skip to code.