Turn a written diagram request into a JSON specification and render a blueprint-style SVG. Create system architectures, request flows, state machines, or neural network diagrams as files for documentation, READMEs, posts, and slides.
Render clean blueprint-style SVG diagrams from JSON specs. Use when users ask to draw, sketch, or diagram a request flow, neural net, transformer block, system architecture, state machine, data pipeline, or any node-and-edge technical visual they want as an SVG for docs, READMEs, posts, or slides.
Review the instructions the agent will receive before you install.
Use diagrammer to turn a small JSON spec into a clean SVG diagram. It is useful when the user wants a precise technical diagram without opening a design tool.
The renderer must be installed locally:
pipx install diagrammer
diagrammer path/to/spec.json > path/to/diagram.svg
{
"nodes": [
{"id": "client", "type": "box", "label": "client"},
{"id": "api", "type": "box", "label": "api"},
{"id": "db", "type": "database", "label": "postgres"}
],
"edges": [
{"from": "client", "to": "api", "label": "request"},
{"from": "api", "to": "db", "label": "query"}
]
}
Built-in node types: box, circle, text, database, stack, group, note, and custom.
Useful optional fields:
direction: "LR" or "TB"router: "straight" or "ortho"label on edgesstyle: "solid" or "dashed"weight: "thin" or "thick"For the full reference, run:
diagrammer prompt
Use diagrammer when the output should be a checked-in SVG artifact, especially for:
Prefer Mermaid when the user specifically asks for Mermaid syntax or wants diagrams rendered by a Markdown platform. Prefer Excalidraw when the user wants editable hand-drawn canvas files.
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