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🌓 Before/After Proof Pack
Turn real before-and-after screenshots into comparable marketplace proof with normalized crops, annotations, captions, and claim checks.
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See it in action
You say
Before: dashboard-old.png After: dashboard-new.png Claim: missing states are now visible and actionable Evidence: fixture includes loading, empty, and error routes Target: 1600x900 gallery image and square thumbnail
Your agent does
Comparability: PASS after matching the 1440x900 content viewport and using the same empty-project fixture. Observable changes: empty state now names the condition, offers one primary action, and preserves navigation context. Unsupported claim: remove 'increases activation' because no activation data was supplied. Assets: paired 1600x900 board, square detail crop, caption, alt text, and claim-evidence table.
What you get
About this skill
Before/After Proof Pack turns a real product improvement into credible visual evidence. Supply the original before and after screenshots, the proposed claim, supporting evidence, and target marketplace dimensions. It checks whether the pair shows the same product, content, state, viewport, and crop; normalizes the presentation without altering the underlying result; maps annotations to observable changes; and flags claims the supplied evidence does not support. The output includes normalized pairs, comparison layouts, marketplace thumbnail and gallery specifications, truthful captions and alt text, and unsupported-claim warnings. It does not invent results, replace screenshots with synthetic product states, or turn aesthetic preference into a measured commercial claim.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Creator
JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.
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