emmanuel-defreitas/gpui-agentation is a Rust development tool that lets you pick screen elements in a running GPUI app, leave notes on them, and helps coding agents inspect the identifier and bounds of that element along with its Rust source location. The repository records v0.4.0 as its latest release and is published under the MIT license. However, the supplied material contains no change list for this version, so what was newly added or altered cannot be confirmed.
The annotation targets are screen elements registered with the app. The tool marks elements with boxes and arrows, and it is not a way to interpret arbitrary screen pixels. Notes can be copied as Markdown or passed to an agent through a local MCP server. According to the README, notes stored in local JSON files can be read not only over MCP but also through REST and SSE paths. The feature focuses on a development workflow that points at a specific element of the GPUI screen together with its code location.
The README explains that the annotation API opens only in development builds and that the distributed release offers no annotation feature. The scope of the tool is therefore limited to designating elements registered in a GPUI app that is still under development. The specific changes in v0.4.0 are likewise not derivable from the supplied material, so it is hard to judge how that release altered features or behavior.