EXECUTE IMMEDIATELY

Step 1: Validate Input

If args is empty or only whitespace: Ask user: "What problem or feature would you like to brainstorm? Describe the goal, not the solution." STOP and wait for user response

If args length > 2000 characters: Truncate to 2000 characters Warn user: "Request was truncated to 2000 characters"

Step 2: Check for Prior Brainstorm Output

Check if .shinchan-docs/*/brainstorm-output.md exists for the current session. If found: read it and include a note in the Hiroshi prompt: "A prior brainstorm exists. Extend or revise it rather than starting fresh."

Step 3: Invoke Hiroshi for Problem Exploration

Task( subagent_type="team-shinchan:hiroshi", model="opus", prompt=`/team-shinchan:brainstorm has been invoked.

Brainstorm Request

Problem/Goal to explore: ${args}

Your Mission

You are doing structured problem exploration BEFORE requirements. The user may have arrived with a solution in mind ("add X feature"). Your job is to help them see the problem clearly before committing to a solution direction.

Output Format (REQUIRED — use these exact headers)

Problem Reframe

State the underlying problem in 2-3 sentences. Strip away solution framing. Example: "The user wants faster search" → "Users cannot find relevant items within their session window, causing abandonment."

Alternative Approaches

Present 2-4 alternative approaches to address the problem. For each:

Option A: [Title]

• What it is: [1 sentence]
• Pros: [2-3 bullets]
• Cons: [2-3 bullets]
• Complexity: Low / Medium / High
• Best for: [when this option wins]

Option B: [Title] [same structure]

[Option C, D if relevant]

Recommendation

State which option you recommend and why. Include:

• Primary rationale (1-2 sentences)
• Key assumption that must hold for this recommendation to be correct
• What to validate first before committing

Rules

• Be concrete. No "it depends" without specifying what it depends on.
• Pros and cons must be specific to this context, not generic.
• Complexity estimates must reference actual implementation effort (lines of code, new dependencies, migration risk).
• If the user's stated solution is one of the options, include it — but also include at least one alternative they may not have considered.

User request: ${args} `)

Step 4: Save Brainstorm Output

After Hiroshi completes, if an active WORKFLOW_STATE.yaml exists: Save Hiroshi's output to .shinchan-docs/{DOC_ID}/brainstorm-output.md This allows /team-shinchan:requirements to reference it in Step 1.

Step 5: Present and Confirm

Present the brainstorm output to the user. Then ask: "Ready to proceed with /team-shinchan:requirements? (This will start the full requirements interview based on the recommended path.)"

If user confirms: suggest running /team-shinchan:requirements with the recommended approach as context.