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Claude Code builds and browser-tests a GIF optimizer

Willison asked Claude Code for web to compile Gifsicle to WebAssembly and build a preview interface. The agent used Rodney to exercise the page and fix UI bugs during implementation.

simonwillison.netAgent: Claudevia Claude Code
OUR ADAPTATION

Suggested prompt

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Build a local browser wrapper for [CLI tool]. Reuse the repository conventions, retain upstream attribution and include a reproducible build script. Test upload, settings, preview and download using browser automation. Report observed results and remaining limitations; stop before publishing.

Evidence at a glance

Sourced account
Source author
Simon Willison
Original account
Read the source ↗
Source link checked
Reported result
Willison shows the working optimizer and reports browser testing that caught minor UI bugs.
Human involvement
Willison watched progress and added requirements for reproducible build files and upstream credit.

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How the agent did it

  1. Inspect existing tools and compile Gifsicle for a browser runtime.
  2. Build upload, compression previews and downloadable results.
  3. Exercise the interface with Rodney and repair observed bugs; preserve the build patch and attribution.

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More details

About this account

Claude selected build and UI details and used a browser tool to check and revise its own output.

Annotated firsthand prompt and session links. Source has no publication date; sourcePublished is omitted from this record.

Credit: Simon Willison

Added to Agents In Use

Source checked

Tools and topics

Claude Code · Gifsicle · WebAssembly · Emscripten · Rodney

Code · Testing

Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.