app-store-screenshot-studio

name	app-store-screenshot-studio
description	Capture real App Store screenshots via Xcode Build MCP, then generate App Store Connect-ready marketing screenshots with Nano Banana Pro (correct sizes, copy, compliance).

App Store Screenshot Studio

A step-by-step workflow for producing App Store Connect-ready screenshot sets.

Important: This is a sequential workflow. Complete each step fully and get user confirmation before moving to the next. Do not skip ahead.

---

Step 1: Create the Screenshot Brief

Goal: Define what screenshots to capture and what marketing copy to use.

What to do

Create a brief with 5-10 frames. For each frame, specify:

Field	Description
frame_id	e.g., 01_hero, 02_search
screen	Which app screen/state to capture
headline	2-5 words, benefit-led
subheadline	Optional, max 10 words
compliance_notes	IAP disclosure needed? Privacy wording?

Rules of thumb:

• One idea per frame
• Strongest value prop first
• Keep text big and scannable
• Use fictional/demo data only
• Never misrepresent features the app doesn't have

See REFERENCE_APPLE.md for compliance guardrails.

Checkpoint

STOP and ask the user:

"Here's the screenshot brief. Does this capture the right screens and messaging? Any changes before I start capturing?"

Do NOT proceed to Step 2 until the user approves the brief.

---

Step 2: Capture Raw Screenshots

Goal: Get real screenshots from the app running in a simulator.

Gate: Verify Xcode Build MCP

Before proceeding, check if Xcode Build MCP tools are available (e.g., xcodebuild_build, simulator_boot, simulator_screenshot).

If NOT available:

STOP. I need Xcode Build MCP to capture screenshots from the simulator.

Install it with:
  claude mcp add XcodeBuildMCP npx xcodebuildmcp@latest

Or add to your MCP config (~/.claude.json):
  {
    "mcpServers": {
      "XcodeBuildMCP": {
        "command": "npx",
        "args": ["-y", "xcodebuildmcp@latest"]
      }
    }
  }

Alternatively, you can provide raw screenshots manually and I'll skip to Step 3.

What to do

1. Build the app
2. Boot the correct simulator (see STEP_2_CAPTURE.md for device selection)
3. Navigate to each screen in the brief
4. Capture screenshots

Output convention:

./screenshots/raw/<locale>/<device_category>/<frame_id>.png

Example: ./screenshots/raw/en-US/iphone_6_9/01_hero.png

See STEP_2_CAPTURE.md for detailed capture guidance.

Checkpoint

STOP and show the user the captured screenshots:

"Here are the raw screenshots I captured. Do these look correct? Any screens need to be recaptured?"

Do NOT proceed to Step 3 until the user confirms the raw screenshots are good.

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Step 3: Generate Draft Composites (1K)

Goal: Create low-resolution marketing composites for approval before investing in high-res.

Gate: Verify Nano Banana Pro

Check if the Nano Banana Pro script exists:

ls ~/.claude/skills/nano-banana-pro/scripts/generate_image.py

If NOT available:

STOP. I need Nano Banana Pro to generate marketing composites.

Install it with:
  git clone --depth 1 https://github.com/steipete/agent-scripts /tmp/agent-scripts && \
    cp -r /tmp/agent-scripts/skills/nano-banana-pro ~/.claude/skills/ && \
    rm -rf /tmp/agent-scripts

Gate: Verify GEMINI_API_KEY

Check if the API key is set:

echo $GEMINI_API_KEY | head -c 10

If NOT available:

STOP. Nano Banana Pro requires a Gemini API key.

Set it with:
  export GEMINI_API_KEY="your-key-here"

Get a key at: https://aistudio.google.com/apikey

What to do

For each frame in the brief, generate a 1K draft:

uv run ~/.claude/skills/nano-banana-pro/scripts/generate_image.py \
  --input-image "./screenshots/raw/en-US/iphone_6_9/01_hero.png" \
  --prompt "Your compositing prompt here" \
  --filename "./screenshots/drafts/en-US/iphone_6_9/01_hero.png" \
  --resolution 1K

CRITICAL:

• --input-image is MANDATORY. Never omit it.
• Use --resolution 1K for drafts (faster, cheaper).
• Output to ./screenshots/drafts/ (not final/).

See STEP_3_COMPOSITE.md for prompt templates.

Checkpoint

STOP and show the user the draft composites:

"Here are the 1K draft composites. Do these look good? Any changes to copy, layout, or style before I generate the high-res finals?"

Do NOT proceed to Step 4 until the user approves the drafts.

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Step 4: Generate Final Composites (2K/4K)

Goal: Re-generate approved drafts at full resolution.

What to do

For each approved draft, regenerate at 2K (or 4K for iPad):

uv run ~/.claude/skills/nano-banana-pro/scripts/generate_image.py \
  --input-image "./screenshots/raw/en-US/iphone_6_9/01_hero.png" \
  --prompt "Same prompt as draft" \
  --filename "./screenshots/final/en-US/iphone_6_9/01_hero.png" \
  --resolution 2K

Output convention:

./screenshots/final/<locale>/<device_category>/<index>_<slug>.png

Validate before proceeding

Run these checks:

• All images are accepted pixel sizes (see REFERENCE_SIZES.md)
• Format is .png or .jpg
• 1-10 images per device category
• No prices or competitor references in copy
• IAP disclosures present where needed

Checkpoint

STOP and show the user the final composites:

"Here are the final high-res composites. Ready to package for submission?"

---

Step 5: Package for Submission

Goal: Produce submission-ready assets.

What to do

1. Create a ZIP of ./screenshots/final/
2. Generate a manifest file:

{
  "locales": {
    "en-US": {
      "iphone_6_9": [
        "01_hero.png",
        "02_search.png",
        "03_detail.png"
      ]
    }
  }
}

Final summary

End your response with:

1. What was generated (locales, device categories, counts)
2. File tree showing raw + final paths
3. Any compliance notes (IAP disclosures, etc.)
4. Recommended next steps

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Quick Reference

• STEP_2_CAPTURE.md — Simulator setup, device selection, capture methods
• STEP_3_COMPOSITE.md — Nano Banana Pro prompts and templates
• REFERENCE_APPLE.md — Apple compliance checklist
• REFERENCE_SIZES.md — Accepted screenshot dimensions