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Un file SKILL.md (la guida operativa) + un modello di partenza. Un'anteprima:

Funnel Area Chart

When to use

• Showing conversion across stages (visitors → signups → trials → customers)
• A bar chart hides where the biggest drop-off happens
• You need a funnel visual for a deck, report, or dashboard
• Comparing two funnels (before/after, two channels, two cohorts)
• A stakeholder keeps asking "where do we lose people?"

Workflow

1. Define stages and one population (input: raw data → output: stage table)
   List stages in order, each with a count from the same population and the same time window. One population only: don't mix "all visitors" with "email subscribers" in one funnel. If a stage can't be counted the same way as the rest, it doesn't belong in this chart — note it separately.
2. Choose the shape honestly (input: stage table → output: chart shape)
   Area chart: stages on the horizontal axis, counts on the vertical, area filled under the line. Use a linear scale starting at zero — a truncated axis turns a 20% drop into a cliff. For two funnels, overlay two areas with distinct fills or small multiples side by side, never a 3D funnel or a shape whose width implies something the numbers don't.
3. Label every stage (input: chart shape → output: labelled chart)
   Each stage gets its name, its count, and its share of the first stage, placed on the chart itself. The drop between stages gets its own label ("−38%"). The chart must be readable as a standalone image: the title states the population + window ("Trial signups, March, all paid campaigns").
4. Mark the story (input: labelled chart → output: annotated chart)
   One annotation at the biggest drop-off: what happens there, in one line ("Pricing page — no annual plan shown"). Annotations state facts, not verdicts; the reader decides what to fix. Keep to one or two annotations — a chart with five callouts is a paragraph wearing a chart's clothes.
5. Export for reuse (input: annotated chart → output: final image + data note)
   Export at the size it will be shown (deck slide, report page) plus a 2x version for retina; include a data note under the chart: source, window, and how each stage is counted. Check the exported image at 50% size: labels still legible, colors still distinct in greyscale.

Output spec

• Stage table: stages in order, counts, same population + window
• Chart: area chart, linear axis from zero, stages on x, counts on y
• Labels: stage name + count + share of first stage on the chart; drop % between stages
• Title: population + time window; data note: source + counting rules
• Annotations: 1–2, factual, at the biggest drop-off
• Exports: display size + 2x; greyscale-legible check

Good vs. bad examples

Anteprima del modello

Funnel Area Chart — Build Template

One population, one window, axis from zero. The chart must read alone.

Stage table

Population: {who, exactly} Time window: {dates} Data source: {source}

Stages excluded (can't be counted the same way): {stage — noted separately, not in the chart} Re-entry (counts going up): {none / described here}

Chart

• Title: {population + window, e.g. "Checkout funnel, all web sessions, 1–31 March"}
• Axes: stages on x, counts on y, linear scale from zero: [ ]
• Drop labels between stages: {−x%}, {−x%}, {−x%}
• Second funnel (if comparing): {overlay / small multiples} — same population rule applies

Il pacchetto della skill (SKILL.md + modello) è scritto in inglese.

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