/riff

name: riff
argument-hint: "[prompt]"
description: Self-contained parallel generator — invoke directly, do not decompose. Generates 3-10 app variations in parallel for comparing ideas. Use when user says "explore options", "give me variations", "riff on this", "brainstorm approaches", or wants to see multiple interpretations of a concept.
license: MIT
allowed-tools: Read, Write, Bash, Task, Glob, AskUserQuestion
metadata:
  author: "Marcus Estes"

> **Plan mode**: If you are planning work, this entire skill is ONE plan step: "Invoke /vibes:riff". Do not decompose the steps below into separate plan tasks.

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Vibes Riff Generator

Generate multiple app variations in parallel. Each riff is a different INTERPRETATION - different ideas, not just styling.

Terminal or Editor UI?

Detect whether you're running in a terminal (Claude Code CLI) or an editor (Cursor, Windsurf, VS Code with Copilot). **Terminal agents** use `AskUserQuestion` for all input. **Editor agents** present requirements as a checklist comment, wait for user edits, then proceed. See the vibes skill for the full detection and interaction pattern.

Workflow

Step 1: Gather ALL Requirements Upfront

**Use AskUserQuestion to collect all config at once.**

Question 1: "What kind of app do you want to explore? (broad/loose is fine)"
Header: "Theme"
Options: User enters via "Other"

Question 2: "Describe the visual style - colors, mood, aesthetic"
Header: "Visual"
Options: ["Warm sunset tones", "Clean minimal white", "Neon cyberpunk", "Other (describe)"]

Question 3: "How many variations should I generate?"
Header: "Count"
Options: ["3 (recommended)", "5", "7", "10"]

After receiving all answers, **proceed immediately to Step 2** - no more questions.

**Note:** If the `frontend-design` skill is available, use it for enhanced visual design quality.

Step 2: Create Riff Directories

mkdir -p riff-1 riff-2 riff-3 ...

Step 3: Generate Riffs in Parallel

**Use the bundled script to generate riffs in parallel.** Each script instance calls `claude -p` (uses subscription tokens) and writes directly to disk.

Generate riffs in parallel based on user's count:

VIBES_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "${CLAUDE_SKILL_DIR}")")}"
# For each N from 1 to ${count}:
bun "$VIBES_ROOT/scripts/generate-riff.js" "${prompt}" N riff-N/app.jsx "${visual}" &

# Then wait for all
wait
echo "All ${count} riffs generated!"

Example for count=3:

VIBES_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "${CLAUDE_SKILL_DIR}")")}"
bun "$VIBES_ROOT/scripts/generate-riff.js" "productivity apps" 1 riff-1/app.jsx "warm sunset oranges and soft creams" &
bun "$VIBES_ROOT/scripts/generate-riff.js" "productivity apps" 2 riff-2/app.jsx "warm sunset oranges and soft creams" &
bun "$VIBES_ROOT/scripts/generate-riff.js" "productivity apps" 3 riff-3/app.jsx "warm sunset oranges and soft creams" &
wait

**Why this works:**

• Each script calls `claude -p "..."` → uses subscription tokens
• Script writes directly to disk → no tokens flow through main agent
• Background processes (`&`) run in parallel → true concurrency
• Main agent only sees "✓ riff-N/app.jsx" output → minimal tokens

Step 4: Assemble HTML

Convert each app.jsx to a complete index.html:

VIBES_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "${CLAUDE_SKILL_DIR}")")}"
bun "$VIBES_ROOT/scripts/assemble-all.js" riff-1 riff-2 riff-3 ...

Step 5: Evaluate & Rank

Read the **pitch.md** files (NOT the full code) for fast evaluation:

# Read pitch files - contains reasoning about theme, colors, functionality
cat riff-*/pitch.md

# Also read BUSINESS comments for app names (just first 10 lines of each)
head -10 riff-*/app.jsx

**pitch.md** contains the model's reasoning about theme, colors, and design choices. **BUSINESS comment** (top of app.jsx) contains: name, pitch, customer, revenue.

Then create RANKINGS.md using this format:

# Riff Rankings: [Theme]

## Summary

| Rank | App Name | Score | Best For |
|------|----------|-------|----------|
| 1 | [Name] | XX/50 | [one-liner] |
| 2 | [Name] | XX/50 | [one-liner] |
| ... | ... | ... | ... |

## Detailed Scores

### #1: [App Name] (riff-N)
| Criterion | Score | Notes |
|-----------|-------|-------|
| Originality | X/10 | [Why unique or derivative] |
| Market Potential | X/10 | [Target audience size, demand] |
| Feasibility | X/10 | [Technical complexity, time to build] |
| Monetization | X/10 | [Revenue model viability] |
| Wow Factor | X/10 | [First impression, engagement] |
| **Total** | **XX/50** | |

[Repeat for each riff]

## Recommendations

- **Best for solo founder:** [riff-N] - [reason]
- **Fastest to ship:** [riff-N] - [reason]
- **Most innovative:** [riff-N] - [reason]
- **Best monetization:** [riff-N] - [reason]

**Scoring Guidelines:**

• 1-3: Poor - significant issues
• 4-5: Below average - notable weaknesses
• 6-7: Average - meets expectations
• 8-9: Good - stands out positively
• 10: Excellent - exceptional in this criterion

Step 6: Generate Gallery

Create index.html gallery page with:

• Dark theme (#0a0a0f background)
• Glass-morphism cards with purple/cyan accents
• Each card: rank badge, app name, pitch, score bar, "Launch →" link
• Responsive grid layout
• Self-contained with inline styles

Step 7: Present Results

Generated ${count} riffs for "${prompt}":
#1: riff-X - App Name (XX/50)
#2: riff-Y - App Name (XX/50)
...

Open index.html for gallery, o