| name | svg-precision |
| description | Deterministic SVG generation, validation, and rendering. Use for icons, diagrams, charts, UI mockups, or technical drawings requiring structural correctness and cross-viewer compatibility. |
| source | https://github.com/dkyazzentwatwa/chatgpt-skills/tree/main/svg-precision-skill |
svg-precision
Generate structurally correct SVGs from a strict JSON spec (scene graph), then validate and optionally render a PNG preview.
Fast path
- Turn the user request into a Spec JSON (use templates in
references/spec.md).
- Build the SVG:
python scripts/svg_cli.py build spec.json out.svg
- Validate:
python scripts/svg_cli.py validate out.svg
- (Optional) Render a PNG preview (requires CairoSVG):
python scripts/svg_cli.py render out.svg out.png --scale 2
Spec design rules (for accuracy)
- Always set
canvas.viewBox and explicit canvas.width/canvas.height.
- Prefer absolute coordinates; use transforms only when they reduce complexity.
- Keep numbers sane: no NaN/inf; round to 3-4 decimals.
- Put reusable items in
defs (markers, gradients, clipPaths) and reference by id.
- For predictable results across viewers, avoid exotic filters unless required.
- Text varies by fonts/viewers. If you need pixel-identical results, treat text as a risk and prefer shapes.
Using the bundled scripts
CLI
python scripts/svg_cli.py build <spec.json> <out.svg>python scripts/svg_cli.py validate <svg>python scripts/svg_cli.py render <svg> <out.png> [--scale N]python scripts/svg_cli.py diff <a.svg> <b.svg> <diff.png> [--scale N] (renders + image-diffs)
As a library (in Python)
from svg_skill import build_svg, validate_svg
svg_text = build_svg(spec_dict)
report = validate_svg(svg_text)
When the request is vague
- Identify the kind of SVG: icon / diagram / chart / UI / technical.
- Pick a template from
references/spec.md and fill in concrete numbers.
- If dimensions are unknown, choose defaults that match the domain:
- icons: 24x24 or 32x32
- UI mockups: 1440x900 or 390x844 (mobile)
- charts: 800x450
- diagrams: 1200x800
- technical drawings: specify units (mm/in) and scale
References
references/spec.md - schema + ready-to-copy templates per SVG typereferences/recipes.md - layout and styling patterns that render consistently
