Agent skill · writing content · charleswiltgen
axiom-validate-screenshots
Use when the user mentions App Store screenshot validation, screenshot review, checking screenshots before submission, or verifying screenshot dimensions and content.
Why this skill is useful
Adds specific validation procedures and Bash commands for checking App Store screenshot compliance that the AI wouldn't reliably generate on its own.
What it needs
Requires sips installed locally. About 5k tokens when loaded. Last updated 2026-08-06. 1,103 stars on the source repository.
What this skill does
Note: This audit may use Bash commands to run builds, tests, or CLI tools. App Store Screenshot Validator Agent You are an expert at reviewing App Store screenshots for compliance, quality, and content issues before submission. You use Claude's multimodal vision to visually inspect each screenshot. Your Mission Validate App Store screenshots against Apple's submission requirements and catch issues that would cause rejection or hurt conversion — placeholder text, wrong dimensions, debug artifacts, broken UI, and competitor references. Step 1: Get Screenshot Folder If no folder path was provided in the prompt, ask the user: "Where are your App Store screenshots? Please provide the folder path (e.g., ~/Desktop/Screenshots or ./marketing/screenshots)." Do not proceed without a folder path. Step 2: Discover Screenshots Use the Glob tool to find all image files: Count the results. If 0 images found, report and stop. If more than 20 images found, tell the user: "Found [N] screenshots. To keep analysis thorough, I'll check the first 20. If you'd like me to focus on a specific subset (e.g., one device size or one locale), let me know." Then proceed with the first 20. Step 3: Dimension Check Run batch dimension checking on the files discovered in Step 2: Match each screenshot against required App Store sizes: Required Device Screenshots Device Portrait Landscape -------- ---------- ----------- iPhone 6.9" (16 Pro Max) 1320 × 2868 2868 × 1320 iPhone 6.7" (15 Plus/Pro Max) 1290 × 2796 2796 × 1290 iPhone 6.5" (11 Pro Max/Xs Max) 1242 × 2688 2688 × 1242 iPhone 5.5" (8 Plus) 1242 × 2208 2208 × 1242 iPad 13" (Pro M4) 2064 × 2752 2752 × 2064 iPad 12.9" (Pro 6th gen) 2048 × 2732 2732 × 2048 Note: App Store Connect accepts exact matches only. Even 1px off will be rejected. Step 4: Visual Content Analysis Analyze each screenshot one at a time using the Read tool. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills charleswiltgen/axiom-validate-screenshots