An open source IDE for reviewing what an agent decided, not just what it changed

Whiteboard is an open source desktop IDE, built on the VS Code codebase, that gives a coding agent an SDK to draw sequence diagrams, entity relationship diagrams and quoted trace excerpts onto a canvas linked to the underlying code. Clicking a diagram element jumps straight to the code it describes. A semantic, AST-aware diff viewer, written in Rust, summarizes large generated functions as pseudocode and collapses routine changes such as tests and documentation by default. A separate decision log lets an agent record why it made an autonomous choice, queryable later against its own trace. The founders say teams at Salesforce and Modal already use it as a review gate for architecture and spec-level changes, a claim that comes from the founders themselves and has no outside confirmation yet. The tool is MIT licensed; a hosted version with multiplayer review is planned. At 114 points and 35 comments about three hours after posting, one of the founders wrote: "As more PRs were merged without our understanding, we felt a cognitive debt begin to seep in, until it became difficult for us to even contribute to the system."

Why it matters: Most teams answer the volume problem by reading less of the diff. Whiteboard answers it by moving the review up a level, to the diagram and the stated decision, so a reviewer can check what an agent meant to do before checking every line of what it did.