Whiteboard is an open-source desktop IDE that lets human developers and AI coding agents design software together on a shared canvas. Agents (e.g., Claude Code, Codex) plug into the app and use an SDK to draw flow diagrams, sequence and ER diagrams, and annotated traces next to the code they describe; clicking a visualization jumps to the underlying code while navigating uses VS Code keybindings and LSP support. The README includes a one-minute demo, quickstart steps to connect agents and review branches, and explicit model guidance (recommends GPT-6 Luna and Claude Opus 5.5 for a balance of intelligence, cost, and speed).
The tool emphasizes higher-level understanding and review: a Rust-based, AST-aware semantic diff viewer summarizes large added functions as pseudocode, collapses tests/docs, and supports a WASM plugin system for customization. A decision log links agent traces to requirements so reviewers can see what choices agents made autonomously. Whiteboard runs locally under an MIT license (self-hostable; a hosted product is planned), collects only anonymous telemetry that excludes user code and prompts, and vendors Code OSS as a baseline. Known limitations include no in-app file editing, limited multi-repo review support, and shared reviews not updating after changes. Contributions and feedback are invited.
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