name: dde-ext-brainstorm
description: "DDE subordinate extension. Multi-solution ideation and tradeoff analysis before plan/implementation. Advisory-only, write-gated by DDE."

DDE Extension: Brainstorm

Skill Version: v0.1

Authority Chain

• Commander: dde-bootstrap
• Write gate: dde-code-guard
• Completion gate: dde-task-closer
• This skill is advisory-only and cannot modify files directly.

When to Use

Use this skill when:
- User asks for: brainstorm, ideation, options, tradeoff, alternatives
- User asks for: 头脑风暴, 方案对比, 思路发散, 可行性讨论, 怎么选方案
- Requirement has multiple feasible paths and needs decision support before implementation
- DDE workflow explicitly selects ideation mode

Do Not Use When

• User explicitly requests direct file modifications now
• Task is deterministic mechanical edit with no decision branches
• A final approved plan already exists and user asks to execute immediately

Hard Constraints

1. Advisory-only: no writes to code/docs/skills in this skill.
2. No requirement authority takeover: Layer 0-4 remains source of truth.
3. If a proposed direction conflicts with Layer docs, emit RFC_REQUIRED and stop for DDE RFC flow.
4. If user chooses a direction that requires edits, emit handoff only and return control to dde-code-guard.

Workflow

Phase 1: Problem Framing

• Restate objective in 1-3 lines.
• List constraints (performance, safety, timeline, compatibility).
• Mark unknowns and assumptions explicitly:
• ASSUMPTION: ...

Phase 2: Option Generation

Generate at least 2 options (prefer 3):
- Option A: conservative / low-risk
- Option B: balanced / default
- Option C: aggressive / high-upside (optional)

For each option include:
- Core idea
- Required changes (high-level)
- Dependencies/tools needed
- Risks/failure modes
- Cost (time/complexity)
- Expected benefit

Phase 3: Tradeoff Matrix

Provide side-by-side matrix scored 1-5:
- feasibility
- implementation effort
- maintainability
- scalability
- risk level (inverse score: lower risk = higher score)
- alignment with Layer docs

Phase 4: Recommendation

• Recommend one option with rationale.
• Provide fallback option.
• List decision locks (what must stay true for this recommendation to hold).

Phase 5: Decision Gate

Ask user to select:
- SELECTED_OPTION: A|B|C
- or request refinement round.

If selection implies requirement/document change:
- emit RFC_REQUIRED and stop for DDE RFC flow.

If selection implies code/doc writes without requirement conflict:
- emit DDE_EXTENSION_HANDOFF_REQUIRED and transfer to dde-code-guard.

Phase 6: Decision Artifact Contract

When user confirms selected option, produce a DDR draft (without writing files in this skill) using this target convention:
- docs/decisions/DDR-YYYYMMDD-<topic>.md
- Template source priority:
1. Project instance: docs/decisions/DDR_TEMPLATE.md
2. Skill template fallback: templates/DDR_TEMPLATE.md

DDR required fields:
- Decision Question
- Options Considered
- Selected Option
- Why Selected
- Impacted Files

Output Contract (Mandatory)

Output in this exact structure:
1. BRAINSTORM BRIEF
2. ASSUMPTIONS
3. OPTIONS
4. TRADEOFF MATRIX
5. RECOMMENDATION
6. DECISION REQUEST
7. HANDOFF STATUS

Where HANDOFF STATUS is one of:
- NO_WRITE_NEEDED
- RFC_REQUIRED
- DDE_EXTENSION_HANDOFF_REQUIRED

Handoff Block Format

When handoff is required, append:

DDE_EXTENSION_HANDOFF_REQUIRED

Fields:
- Reason
- Selected option
- Target files (if known)
- Expected effect
- Risk notes
- Rollback note (high-level)