excalidraw-dag

name	excalidraw-dag
description	Create very clean, legible Excalidraw DAG/system diagrams for pi-notes. Use for architecture diagrams, feedback loops, data/control flow, state/lifecycle maps, or any request for a simple Excalidraw diagram where readability matters.
disable-model-invocation	true

Excalidraw DAG

Create concise Excalidraw diagrams that explain systems. Prefer DAGs.

Default shape

Use this unless the user asks otherwise:

• left-to-right flow
• 4–8 boxes max
• one concept per box
• short labels: 1–3 words plus optional tiny subtitle
• straight arrows
• no icons unless they clarify
• muted fills, dark text, lots of contrast
• output under docs/diagrams/*.excalidraw
• link from a Brain entry so it renders inline in /notes

Hard rules

• Legibility beats completeness.
• Prefer deleting nodes over shrinking text.
• Do not make spaghetti. If edges cross, change layout or split the diagram.
• Avoid decorative bullshit: shadows, gradients, cute icons, crowded legends.
• Use fontFamily: 5 for all text.
• Keep generated files valid Excalidraw JSON.
• Do not paste huge Excalidraw JSON into chat.

DAG layout recipe

1. Extract nodes: actors, services, artifacts, stores, outputs.
2. Pick one primary direction: usually left → right.
3. Arrange by lifecycle stage, not implementation package.
4. Draw only the main edges needed to explain causality.
5. Label edges with verbs only when ambiguity remains.
6. Add receipts/logs as small bottom-row boxes if useful.

pi-notes inline rendering

To show a diagram inside a note, add a fenced code block containing the diagram path:

docs/diagrams/example.excalidraw

The Document Host renders that path inline in the note route.

Good output summary

Always report:

• diagram file path
• Brain entry that links it
• local note URL
• element count
• what the diagram intentionally omits

Useful current reference

• Diagram note: .brain/resources/excalidraw-diagrams.svx
• Local URL: http://127.0.0.1:4188/notes/resources/excalidraw-diagrams
• Example diagram: docs/diagrams/pi-notes-feedback-loop.excalidraw