kevinhamza/devin-4.0/diagram-maker

Diagram Maker

Create diagrams as artifacts, not prose. Choose one output mode:

• clean-svg: educational concepts, physical systems, processes, lifecycle, simple data flow.
• architecture-svg: software/cloud/infra topology, services, databases, queues, trust zones.
• excalidraw: editable hand-drawn whiteboard, flowchart, sequence, architecture sketch.

Routing

• User wants editable/collaborative: choose Excalidraw.
• User wants polished standalone browser output: choose SVG/HTML.
• Software architecture with infra components: choose architecture SVG.
• Science, product, process, concept map, physical object: choose clean SVG.
• Unsure: ask one short question only if output format matters; otherwise choose clean SVG.

Workflow

1. Extract nodes, groups, labels, and directed relationships.
2. Pick layout first: left-to-right, top-down, hub-spoke, swimlanes, layered stack, sequence.
3. Keep labels short. Prefer 5-9 main elements over dense diagrams.
4. Generate the file at the requested path, or ./diagram.html / ./diagram.excalidraw.
5. Verify syntax by opening/parsing when feasible.

SVG/HTML rules

• Single standalone .html file with inline CSS and inline SVG.
• No external fonts, JS, images, gradients, glows, decorative blobs, or remote assets.
• Use semantic colors, not rainbow sequences: neutral, input, process, storage, external, risk.
• Draw connectors before nodes so arrows sit behind boxes.
• Every connector path has fill="none" and a marker arrow when directed.
• Leave 24px text padding inside boxes; do not let text touch borders.
• Legend only when symbols/colors are not obvious.

SVG template

Use references/svg-template.md as the wrapper and replace <!-- SVG -->.

Excalidraw rules

• Save .excalidraw JSON with type, version, source, elements, and appState.
• Use bound text for shape labels. Do not use a nonstandard label property.
• Keep bound text immediately after its container in the elements array.
• Minimum labeled shape: 120x60. Minimum body text: 16px.
• Use roughness 1, fontFamily: 1, and simple fills.

For exact Excalidraw element snippets, read references/excalidraw-patterns.md.