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+---
+description: Brainstorm product ideas or experiments from PM, Designer, and Engineer perspectives — for existing or new products
+argument-hint: "[ideas|experiments] [existing|new] <product or feature description>"
+---
+
+# /brainstorm -- Multi-Perspective Ideation
+
+Generate creative product ideas or experiment designs from three perspectives (PM, Designer, Engineer), tailored to whether you're working on an existing product or building something new.
+
+## Invocation
+
+```
+/brainstorm ideas existing Mobile banking app engagement
+/brainstorm ideas new AI-powered meal planning for busy parents
+/brainstorm experiments existing Onboarding flow redesign
+/brainstorm experiments new Marketplace for freelance designers
+/brainstorm                          # interactive mode — asks what you need
+```
+
+## Workflow
+
+### Step 1: Determine Mode
+
+Parse the arguments to identify two dimensions:
+
+1. **What to brainstorm**: `ideas` (feature concepts) or `experiments` (validation tests)
+2. **Product stage**: `existing` (continuous discovery) or `new` (initial discovery)
+
+If either dimension is missing, ask the user. If both are missing, ask:
+- "Are you brainstorming **ideas** for what to build, or **experiments** to validate assumptions?"
+- "Is this for an **existing** product or a **new** product concept?"
+
+### Step 2: Gather Context
+
+Ask the user for context. Be conversational — ask the most critical question first:
+
+**For existing products:**
+- What is the product? Who are current users?
+- What opportunity area or problem space are you exploring?
+- Any constraints (technical debt, platform limitations, team capacity)?
+- What has been tried before?
+
+**For new products:**
+- What is the product concept? What problem does it solve?
+- Who is the target user? What's their current alternative?
+- What stage are you at? (napkin sketch, validated problem, early prototype)
+- What are the riskiest assumptions?
+
+Accept context from uploaded files (PRDs, research docs, strategy decks), pasted text, or conversation.
+
+### Step 3: Generate Output
+
+**If brainstorming ideas** — apply the **brainstorm-ideas-existing** or **brainstorm-ideas-new** skill:
+- Generate ideas from three perspectives: Product Manager (user value, business impact), Designer (UX, delight, accessibility), Engineer (technical innovation, platform leverage, scalability)
+- For each idea: name, description, target user impact, feasibility assessment
+- Rank the top 5 ideas with rationale
+- Flag which ideas could be quick wins vs. strategic bets
+
+**If brainstorming experiments** — apply the **brainstorm-experiments-existing** or **brainstorm-experiments-new** skill:
+- For existing products: suggest A/B tests, prototypes, fake-door tests, wizard-of-oz, concierge experiments, and spikes
+- For new products: create XYZ+S hypotheses and suggest pretotype experiments (landing pages, explainer videos, pre-orders, concierge MVPs)
+- For each experiment: hypothesis, method, success criteria, effort estimate, expected timeline
+- Rank by learning-per-effort ratio
+
+### Step 4: Deepen and Iterate
+
+After presenting initial results, offer:
+- "Want me to **detail** any of these ideas into a fuller spec?"
+- "Should I **identify assumptions** behind the top ideas?" (chains into the `identify-assumptions-existing` or `identify-assumptions-new` skill)
+- "Want to **design experiments** to validate the top ideas?" (chains into experiment mode)
+- "Should I **prioritize** these against your current backlog?" (chains into the `prioritize-features` skill)
+
+## Output Format
+
+### For Ideas:
+```
+## Brainstorm: [Product/Feature Area]
+**Mode**: Ideas for [existing/new] product
+**Context**: [1-2 sentence summary]
+
+### PM Perspective
+1. **[Idea Name]** — [description] | Impact: [H/M/L] | Effort: [H/M/L]
+2. ...
+
+### Designer Perspective
+1. **[Idea Name]** — [description] | Impact: [H/M/L] | Effort: [H/M/L]
+2. ...
+
+### Engineer Perspective
+1. **[Idea Name]** — [description] | Impact: [H/M/L] | Effort: [H/M/L]
+2. ...
+
+### Top 5 Recommendations
+| Rank | Idea | Why | Quick Win? |
+|------|------|-----|------------|
+
+### Next Steps
+[What to do with these ideas]
+```
+
+### For Experiments:
+```
+## Experiment Design: [Product/Feature Area]
+**Mode**: Experiments for [existing/new] product
+
+### Hypotheses
+1. **[Hypothesis]** — XYZ format: [X]% of [Y] will [Z] within [S timeframe]
+
+### Recommended Experiments
+| # | Experiment | Tests Hypothesis | Method | Effort | Timeline |
+|---|-----------|-----------------|--------|--------|----------|
+
+### Experiment Details
+[For each experiment: setup, success criteria, risks, what you'll learn]
+```
+
+## Notes
+
+- For existing products, ground ideas in current user behavior and validated problems
+- For new products, focus on desirability and feasibility risks first
+- If the user uploads a research doc or interview transcript, extract insights before brainstorming
+- Encourage breadth first, then depth — generate many ideas before evaluating