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Resize and validate App Store screenshots with current asc screenshot-size data and macOS sips.
Passed 22 of 22 test cases with the skill, and 10 of 22 without it.
and 13 more in the full report
12 fixed10 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
After validating my resized screenshots in ./resized for device type IPHONE_65 and localization LOC_ID, what command performs the actual upload to App Store Connect?
| Checked | Without skill | With skill |
|---|---|---|
| Executes asc screenshots upload with --version-localization LOC_ID. | Missed | Passed |
The instructions your model reads when the skill loads.
Use this skill to prepare screenshots for App Store Connect. Do not rely on a hard-coded dimension table in this skill; the CLI owns the current size matrix.
Always discover current accepted sizes from asc first:
asc screenshots sizes --output table
asc screenshots sizes --all --output table
For local validation before upload:
asc screenshots validate --path "./screenshots/iphone" --device-type "IPHONE_65" --output table
asc screenshots validate --path "./screenshots/ipad" --device-type "IPAD_PRO_3GEN_129" --output table
Common current device-type anchors:
IPHONE_65 for the common 6.5-inch iPhone screenshot set.IPAD_PRO_3GEN_129 for the common 12.9/13-inch iPad screenshot set.Run asc screenshots sizes --all when targeting other display types such as 6.9-inch iPhone, Apple TV, Mac, Vision Pro, iMessage, or Watch.
macOS screenshots can contain hidden Unicode spaces that make tools fail with "not a valid file". Sanitize before batch work:
python3 -c "
import os
for f in os.listdir('.'):
clean = f.replace('\u202f', ' ')
if f != clean:
os.rename(f, clean)
test cases passed, vs 10 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.