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Programmatic canvas toolkit for creating, editing, and refining Excalidraw diagrams via MCP tools with real-time canvas sync. Use when an agent needs to (1) draw or lay out diagrams on a live canvas, (2) iteratively refine diagrams using describe_scene and get_canvas_screenshot to see its own work, (3) export/import .excalidraw files or PNG/SVG images, (4) save/restore canvas snapshots, (5) convert Mermaid to Excalidraw, or (6) perform element-level CRUD, alignment, distribution, grouping, duplication, and locking. Requires a running canvas server (EXPRESS_SERVER_URL, default http://127.0.0.1:3000).

Use when you want to make something measurably better and let the agent do the trial-and-error for you — for example "make this faster", "how can I improve this?", "reduce cost/memory", "increase test coverage", or "make this search return better results" (also tuning an LLM training run). You don't need to know the metric upfront; it helps you set one. It keeps a metric, tries ideas in an isolated copy, keeps what improves and reverts what doesn't, and stops when it stops getting better.