Create charts and dashboards with a consistent approach to chart selection, color validation, labels, and interaction. Includes a palette checker and accessibility rules for readable visualizations in both light and dark modes.
Use this skill whenever you are about to create ANY chart, graph, plot, dashboard, or data visualization, in ANY output medium — an HTML or React artifact, inline SVG, plotting code in any library (matplotlib, plotly, d3, Recharts, …), an image/PNG you will render and upload, or a chart shared into Slack. Read it BEFORE writing the first line of chart code, choosing chart colors, building a stat tile / meter / KPI row, or laying out a dashboard. When the destination is a first-party document connector (host-designated, never self-described) that renders live charts, hand it the rows (inline, or as an uploaded data file the chart cites) rather than a rendered PNG/SVG — a picture of a chart loses hover, data inspection and per-value comments. Produces visualizations that read as one system — elegant, accessible, consistent in light and dark — using a brand-neutral placeholder palette you swap for your own. Teaches a design-system-agnostic method: a form heuristic, a color formula with a runnable validator, mark specs, and interaction rules. A validated default palette is documented in `references/palette.md` — swap that file's values for your brand's. Triggers on: "chart", "graph", "plot", "data viz", "visualization", "dashboard", "analytics", "visualize data", "categorical colors", "sequential / diverging palette", "stat tile", "sparkline", "heatmap", "legend", "axis", "tooltip", "chart colors", "color by series".
Run score Not tested
See how to installdataviz guides chart and dashboard creation through a sequence covering chart type, colors, display elements, and interaction. It starts with what the data needs to show, such as comparisons, increases and decreases, or changes over time. When appropriate, it uses a large number display instead of a chart.
An included script checks palette lightness, how easily colors can be distinguished, and contrast. The skill also covers legends, labels, tooltips, and table views.
Use it to keep multiple charts consistent or make them readable in both light and dark modes. Its methods apply across HTML, React, images, and different visualization libraries. It also explains how to substitute colors that match your brand.
Run palette validation with node scripts/validate_palette.js or as a JavaScript module within the page. Color checks cannot detect layout problems, so the rendered result also needs visual inspection. When a supported document connector can render live charts, provide the underlying data rather than an image.
This overview was written by AI (OpenAI Codex) from the public SKILL.md. Check the original below for the exact behavior.
AI checked the SKILL.md for operations that need care and for setup requirements. The score comes only from actually running the skill (hands-on test).
Not counted in the score. Rated by AI (OpenAI Codex) as of Oct 24, 2026. Treat it as a guide and read the original before installing.
Review the instructions the agent will receive before you install.
A chart is read by people and executed by you. This skill turns "make it look good" into a procedure with checks, so the result is right by construction rather than by taste.
The method here is design-system-agnostic. Nothing in the procedure, the form
heuristic, the six checks, or the mark specs is specific to one product. A design
system supplies a small set of parameters (its ramps, a categorical order, a
diverging pair, a status palette, a texture, its surfaces, its filter components);
the method consumes them unchanged. A validated default palette is the
reference instance, fully specified in references/palette.md. To target your
brand, read that file's structure and substitute its values - touch nothing else.
The single most important habit: the color part is computable, so compute it. Never eyeball whether a palette is colorblind-safe - run
scripts/validate_palette.js.
Color comes LAST. Most bad charts pick colors first.
references/choosing-a-form.mdreferences/color-formula.mdnode scripts/validate_palette.js "<hex,hex,...>" --mode light (relative to
this skill's base directory - or load it as <script type="module"> in the
chart's own page, where it reads
data-palette off <body> and logs a console.table report). It returns
pass/fail on the lightness band, chroma floor, adjacent-pair CVD separation,
the normal-vision floor, and contrast. Fix anything that FAILs before continuing. Re-run for
--mode dark with that mode's surface.references/marks-and-anatomy.mdreferences/interaction.mdThen check the result against references/anti-patterns.md - it is the catalog
of what goes wrong. If your chart matches an entry, it's wrong.
--pairs all cut series or facet instead - see check 4. A contrast WARN
obligates visible labels or a table view - it is not dismissable.The method is invariant; only these parameters change per system. The reference
instance - every value filled in - is references/palette.md.
| Parameter | What the system provides |
|---|---|
| Ramps | the hue scales (named steps) the palette draws from |
| Categorical theme | the fixed hue order (a named theme); default + alternates |
| Sequential hue | the default single hue for magnitude |
| Diverging pair | two warm/cool poles + a neutral midpoint |
| Status palette | good / warning / serious / critical - steps distinct from categorical |
| Texture fill | one directional hand-drawn fill, used at 45° / 135° |
| Surfaces | light & dark chart-surface colors (the validator needs these) |
| Filter controls | date-range & dimension controls (behavioral spec in interaction.md) |
To onboard a new system: fill those rows, feed its ramps to the validator, and let it snap each slot to the nearest passing step. Structure and rules stay as written.
| File | What it answers |
|---|---|
references/choosing-a-form.md | Which chart type / is it even a chart? |
references/color-formula.md | The four jobs, the six checks, snap-to-passing |
references/marks-and-anatomy.md | Mark specs, spacers, labels, figures, hero number |
references/interaction.md | Tooltips & hover, filters & time ranges |
references/components.md | The pieces a chart is made of - build each in plain HTML |
references/anti-patterns.md | What goes wrong - check every chart against this |
references/palette.md | The reference palette instance - every parameter, filled in; swap for your brand's |
scripts/validate_palette.js | Runnable six-checks validator (run it; don't eyeball) |
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