Coco MCP: a full desktop app built on gpui-kit (and a note of thanks)

[camiloazula]

I've just published Coco MCP, a debugger for Model Context Protocol servers: one Rust binary with a command-line mode and a native window, and the window is drawn with gpui-kit 0.6 on gpui-pre 0.3.

Repository: https://github.com/camiloazula/coco-mcp

What it uses from the kit: resizable panels, the input and dropdown components, tooltips, the Lucide icon set, the theme registry with a custom dark and light theme, and the tree-sitter feature for the JSON views. The overlays (dialogs, palette, context menus) are hand-written for the design; the rest is the kit as shipped.

Two things that may interest other people building on it:

• Every screen is rendered headless in tests using the kit's test support, against a mock MCP server. The README's animated tour is assembled from those frames, so the documentation cannot drift from the UI.
• The engineering notes in CONTRIBUTING record what we learned about the kit, including one leak we worked around (the ContextMenu's popup entity in headless runs) and why we picked resizable panels over DockArea for a fixed layout.

Thank you for the kit; it made a native GPUI app outside Zed practical for a small project. Happy to answer questions, and glad to be linked from anywhere you list downstream apps.