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+# gribouille-skill
+
+A Claude Code / OpenCode skill for generating [gribouille](https://m.canouil.dev/gribouille) charts in [Typst](https://typst.app), plus a working example.
+
+## What's here
+
+| File | Purpose |
+|------|---------|
+| `drop.typ` | Standalone example — a scatter plot of sensor fleet activity (log-log scales, annotations, size encoding) |
+| `gribouille-skill/SKILL.md` | The agent skill definition with idiomatic gribouille patterns, anti-patterns, and a quick-reference |
+| `gribouille-skill/references/geom-table.md` | Full parameter reference for geoms |
+| `gribouille-skill/references/scale-table.md` | Full parameter reference for scales |
+
+## Using the skill
+
+The skill implements Wilkinson's Grammar of Graphics (same mental model as ggplot2 / plotnine) compiled natively in Typst.
+
+### Quick start
+
+1. Install gribouille from Typst Universe or clone it locally.
+2. Clone `https://github.com/mcanouil/gribouille` into the directory where your doc is (until it's in the Universe)
+3. Import the library:
+   ```typst
+   #import "./gribouille/lib.typ":*
+   ```
+4. Build a plot:
+   ```typst
+   #plot(
+     data: penguins,
+     mapping: aes(x: "flipper-len", y: "body-mass", colour: "species"),
+     layers: (geom-point(size: 2pt),),
+     theme: theme-minimal(),
+     width: 12cm, height: 9cm,
+   )
+   ```
+
+### Supported chart types
+
+Scatter, line, area, bar, histogram, boxplot, heatmap, faceted small-multiples, multi-panel compositions, and more. See `gribouille-skill/SKILL.md` for the full chart-type decision table.
+
+### Key conventions
+
+- Column names in `aes()` must be **quoted strings**: `aes(x: "flipper-len")`.
+- Always include `width:` and `height:` — gribouille has no default size.
+- Use `as-factor("col")` for numeric-looking categorical strings.
+- Use `typst("markup")` inside `labs()` when you need rich text.
+
+## Example: `drop.typ`
+
+`drop.typ` reads `src_ip_last1h.csv` and renders a log-log scatter of source-IP activity:
+
+- **x**: total sessions (`scale-x-log10`)
+- **y**: unique destination ports (`scale-y-log10`)
+- **size**: number of unique sensors (`scale-size-area`)
+- **annotation**: callout label for the dominant IP
+
+Compile with:
+```bash
+typst compile drop.typ
+```
+
+## Resources
+
+- [gribouille docs](https://m.canouil.dev/gribouille)
+- [Typst docs](https://typst.app/docs)
+
+## License
+
+MIT