Whiteboard open-sources a canvas where the agent draws diagrams of its own changes, linked to code.

332 points on Show HN September 24, 924 stars, MIT licensed, built on a vendored Code OSS fork. Claude Code, Codex or another agent gets an SDK to draw sequence and ER diagrams on a desktop canvas, and clicking a diagram element jumps to the underlying code through LSP navigation. (devdotfast/whiteboard) It also has a Rust AST-aware semantic diff that summarizes large added functions as pseudocode and collapses tests and docs, plus a decision log linking agent traces to the requirements you set. Reviewing an agent branch as a diagram plus a list of choices the agent made on its own is a review model I haven't tried, and I'd like to.