Developer builds browser tool to give AI coding agents verifiable UI checks

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A developer has released hwatu, an open-source browser tool built to let AI coding agents verify UI changes with measurable precision instead of making unsubstantiated claims of success. The tool runs a full verification loop — including page load, DOM checks, screenshot capture, and pixel-level diffing — in approximately 87 milliseconds. Unlike Chromium-based solutions, hwatu is a single static Rust binary that relies on WebKitGTK 6.0, avoiding large per-project downloads. It supports three integration protocols — MCP, CLI, and a JSON socket — making it compatible with agents like Claude Code, Cursor, and Jcode. The project is MIT licensed and currently available for Linux, with source code and benchmarking methodology published on GitHub.

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