Chart Type Chooser

I have data. I want to communicate something with a chart. Help me pick the right chart type.

Ask me first:
- What data do you have? (columns, roughly how many rows)
- What question are you trying to answer with the chart?
- Who's the audience? (technical / executive / general public)

Then output:

**Recommended chart type** — one specific type (bar, line, scatter, small multiples, heatmap, etc.). NOT a list of options.

**Why this one** — 2-3 sentences tying it to your question and data shape.

**How to build it** — the axis choices, sort order, color rules, and any annotations or reference lines that make the point land.

**Charts to AVOID for this data** — 2-3 common misfires and why they'd be worse. (Pie charts with too many slices, dual-axis, 3D anything, etc.)

**One thing to double-check** — the assumption in your data that would make the chart misleading if wrong.

Rules:
- Never suggest 3D or animated charts.
- Never suggest a pie chart for more than 5 slices, or for anything comparative.
- Never suggest a dual-axis chart unless the two series share meaningful units.
- If the "question" doesn't need a chart (just a number, or a table), say so.

## How to use it

Paste this prompt with your data description and question. Get a chart choice + build recipe. Use in your BI tool (Metabase, Tableau, Looker) or a plotting library (matplotlib, D3, Recharts).

## Why it works

Wrong chart type is the #1 reason data doesn't persuade. The choice depends on your data shape AND the question — asking about both up front produces a better call than a chart-type flowchart alone.