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Generate publication-quality PNG chart images from data, supporting line, bar, area, candlestick, pie, and heatmap charts.
6 of 25 test cases passed with the skill.
Tokens, turns and time describe resource use, not a dollar price.
Lift withheld: 6 comparable cases; this report requires 8.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
I have activity logs by day of week and hour of day: [{'x':'Mon','y':'09:00','value':12},{'x':'Mon','y':'10:00','value':45},{'x':'Tue','y':'09:00','value':8}]. Generate a matrix heatmap PNG titled 'Activity Intensity' using the viridis color scheme.
| Checked | Without skill | With skill |
|---|---|---|
| Uses chart.mjs script with --type heatmap | Missed | Passed |
| Includes --color-scheme viridis flag | Missed | Passed |
The instructions your model reads when the skill loads.
Generate PNG chart images from data using Vega-Lite. Perfect for headless server environments.
Built for Fly.io / VPS / Docker deployments:
canvas which requires build tools)cd /data/clawd/skills/chart-image/scripts && npm install
node /data/clawd/skills/chart-image/scripts/chart.mjs \
--type line \
--data '[{"x":"10:00","y":25},{"x":"10:30","y":27},{"x":"11:00","y":31}]' \
--title "Price Over Time" \
--output chart.png
node chart.mjs --type line --data '[{"x":"A","y":10},{"x":"B","y":15}]' --output line.png
node chart.mjs --type bar --data '[{"x":"A","y":10},{"x":"B","y":15}]' --output bar.png
test cases passed with the skill
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