Vibe Coding
Whiteboard (YC W26) open-sources a canvas where Claude Code or Codex draws diagrams of its changes linked to the code and its own traces
Whiteboard hit 332 points on Show HN on 2026-09-24 (repo devdotfast/whiteboard, 924 stars, MIT). 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. The app includes a Rust AST-aware semantic diff that summarizes large added functions as pseudocode and collapses tests and docs, plus a decision log that links agent traces to the requirements you set. The pitch is reviewing agent branches through diagrams and a list of the choices the agent made on its own, instead of reading a raw diff.
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