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Command-line tools that delegate analysis tasks to AI models. Includes image description, screenshot comparison, essay generation from text, and boolean condition evaluation.
Passed 18 of 20 test cases with the skill, and 9 of 20 without it.
and 7 more in the full report
10 fixed10 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.
I ran `scripts/screenshot-compare render1.png render2.png` and both images are completely identical pixel-for-pixel. What exit code indicates that no visual differences were found?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies exit code 2 when images are identical | Missed | Passed |
The instructions your model reads when the skill loads.
Environment: Set GEMINI_API_KEY before running any commands.
Dependencies: curl, jq (all tools); base64, magick (image tools only)
# Describe an image (generate alt-text)
scripts/screenshot-describe screenshot.png
# Compare two images for visual differences
scripts/screenshot-compare before.png after.png
# Generate essay-length analysis from text
scripts/emerson "Summarize the key changes" < documentation.md
# Evaluate a boolean condition against text
echo "Hello world" | scripts/satisfies "is a greeting"
Generate concise alt-text for an image. Optimized for UI captures.
scripts/screenshot-describe IMAGE [PROMPT]
Exit codes: 0 success, 1 error, 127 missing dependency
Compare two images for visual differences. Identifies layout shifts, color changes, padding, and text updates.
scripts/screenshot-compare IMAGE1 IMAGE2 [PROMPT]
test cases passed, vs 9 / 20 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.