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Appstore screenshot validator

Skill Xopoko/plug-n-skills/plugins/build-swift-apps/skills/appstore-screenshot-validator

Ready-to-install skills and plugins for Codex, Claude Code, and AI coding agents: practical workflows for app delivery, architecture, research, design, and agent tooling.

Install
npx -y skills add Xopoko/plug-n-skills --skill appstore-screenshot-validator

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

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  • 8 stars8 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

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Resize, strip alpha, color-convert, validate, and upload App Store screenshots using current `asc screenshots` size data and macOS `sips`.

SKILL.md

2.0 KB, 418 tokens by cl100k_base, as published. Nobody here has run it

App Store Screenshot Validator

Prepare screenshots for App Store Connect. Do not hard-code Apple size tables here; asc screenshots sizes is the source of truth.

Source Of Truth

asc screenshots sizes --output table
asc screenshots sizes --all --output table

Common anchors: IPHONE_65 and IPAD_PRO_3GEN_129. Use --all for other iPhone sizes, Apple TV, Mac, Vision Pro, iMessage, or Watch.

Local Audit Helper

After choosing target dimensions from ASC, inspect local screenshots with the bundled helper:

python3 "$PLUGIN_ROOT/skills/appstore-screenshot-validator/scripts/screenshot_audit.py" \
  "./screenshots/iphone" --recursive --allow-size 1284x2778 --allow-rotated --fail-on-alpha

The helper reads PNG/JPEG headers only. It does not resize, rewrite, strip alpha, upload, or call ASC. Pass --json for machine-readable output.

Workflow

  1. Query current screenshot size requirements with asc screenshots sizes --all.
  2. Run screenshot_audit.py against candidate PNG/JPEG files; fail on alpha and hidden Unicode filename spaces before upload.
  3. Preserve originals. Write sanitized, alpha-stripped, resized, or color-converted images to a separate directory.
  4. Use sips for macOS image rewrites only after selecting an ASC target size; sips -z takes height then width.
  5. Run asc screenshots validate on the final directory, then asc screenshots upload --dry-run, then upload only after the dry-run is clean.

Guardrails

Preserve originals by writing to a separate directory. Do not stretch across incompatible aspect ratios unless the user accepts the visual tradeoff. Prefer asc screenshots validate over visual inspection before upload.

References

  • references/appstore-screenshot-validator.md for detailed asc, sips, filename cleanup, validate, and upload commands.

What ships with it: 1 file

9.5 KB alongside SKILL.md, 1 of them executable

scripts/

Gives 0 of the 12 instructions most quality gates skills give in 418 tokens

Counted across 1,195 of the 2,094 authors here whose files we hold, read 2026-08-07

  • Read the output and check the exit codein 54 of 1195, across 14 files
  • Verify requirements using a line-by-line checklistin 53 of 1195, across 12 files
  • Identify the verification command proving the claimin 51 of 1195, across 12 files
  • Run the full verification commandin 50 of 1195, across 11 files
  • Verify output confirms the claimin 49 of 1195, across 12 files
  • Check version control diff after agent delegationin 46 of 1195, across 6 files
  • State claim with evidencein 44 of 1195, across 4 files
  • Run the test suitein 33 of 1195, across 26 files
  • Keep state in memory by defaultin 27 of 1195, across 6 files
  • Make prototype runnable with one commandin 26 of 1195, across 5 files
  • Produce a verification reportin 25 of 1195, across 14 files
  • Detect the package manager from lockfilesin 24 of 1195, across 5 files

Said here and by no other author read

  • Query current screenshot sizes from ASC
  • Run screenshot audit script on candidate files
  • Fail on alpha and hidden Unicode filename spaces
  • Write processed images to a separate directory
  • Preserve original image files
  • Select an ASC target size before resizing

Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once. Length counted with cl100k_base; the agent that loads this file may tokenize it differently.

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