Skills

Data & charts

Skills that do the arithmetic a model gets wrong quietly: cleaning a table, profiling it, and drawing it.

Skill	What it does
`csv-cleaner`	Cleans a CSV deterministically — trims cells, snake_cases headers, drops empty rows and columns, removes duplicates, converts numbers (including `$1,200` and `(56)`) and dates — and writes the cleaned file plus a report of every change.
`data-profiler`	Profiles a CSV column by column — inferred type, nulls, unique values, most frequent values, and min / quartiles / median / max / mean / standard deviation — as `profile.json` and a readable `profile.md`, with data-quality flags.
`basic-chart-builder`	Draws one clean PNG chart — bar, horizontal bar, line, area, scatter or pie — from a JSON spec, with labels, stacking and number formats.

`csv-cleaner`

Cleans a CSV deterministically — trims cells, snake_cases headers, drops empty rows and columns, removes duplicates, converts numbers (including $1,200 and (56)) and dates — and writes the cleaned file plus a report of every change.

Use it for	"Clean this export", "dedupe these rows" — and before profiling or charting messy data.
Tags	`data`, `cleaning`
Kind	Script — runs `scripts/run.py` in the sandbox via `run_skill_script`; input is passed as arguments (the sandbox has no network and cannot see attachments)
Needs tools	none

Each step can be switched off with an options object. Keep input under about 100 KB; larger data should be sampled, and the agent says so.

`data-profiler`

Profiles a CSV column by column — inferred type, nulls, unique values, most frequent values, and min / quartiles / median / max / mean / standard deviation — as profile.json and a readable profile.md, with data-quality flags.

Use it for	"What's in this data?", "is it any good?" — the first step of any analysis.
Tags	`data`, `analysis`
Kind	Script — runs `scripts/run.py` in the sandbox via `run_skill_script`; input is passed as arguments (the sandbox has no network and cannot see attachments)
Needs tools	none

Profile the cleaned output if csv-cleaner ran first.

`basic-chart-builder`

Draws one clean PNG chart — bar, horizontal bar, line, area, scatter or pie — from a JSON spec, with labels, stacking and number formats.

Use it for	A chart as a file, for example to go with a PDF report.
Tags	`data`, `viz`, `reporting`
Kind	Script — runs `scripts/run.py` in the sandbox via `run_skill_script`; input is passed as arguments (the sandbox has no network and cannot see attachments)
Needs tools	none

"Basic" is a scope claim: one chart, one set of axes; no subplots, dual axes or maps.
For an interactive chart in chat, agents use the render_chart tool instead.