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Chartli

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chartli

Chartli is an Agent Skill for documents published in the ahmadawais/chartli repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Install and use chartli to render terminal charts from numeric text files or stdin.

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/ahmadawais/chartli/blob/HEAD/skills/chartli/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/chartli, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

chartli Skill

Use this skill when an agent needs to visualize numeric data in the terminal as ASCII/Unicode/SVG charts.

Install

npx skills add ahmadawais/chartli

CLI install/use

Instant use:

npx chartli --help

Global install:

npm i -g chartli

What chartli can do

  • Render chart types: ascii, spark, bars, columns, heatmap, unicode, braille, svg
  • Read from file path input
  • Read from stdin when no file is passed
  • Control output dimensions with --width and --height
  • Render SVG with --mode circles|lines
  • Add x and y axis titles with --x-axis-label and --y-axis-label
  • Add custom tick/category labels with --x-labels and --series-labels
  • Show raw values on the plotted data with --data-labels
  • Promote the first numeric column into x-axis labels with --first-column-x

Command templates

From file:

npx chartli <file> -t <type> [--width N] [--height N] [--mode circles|lines] [--x-axis-label LABEL] [--y-axis-label LABEL] [--x-labels a,b,c] [--series-labels foo,bar] [--data-labels] [--first-column-x]

From stdin:

printf 'x y\n1 10\n2 20\n3 15\n' | npx chartli -t ascii -w 24 -h 8

Labeled two-column chart:

printf 'day value\n1 10\n2 20\n3 15\n' | npx chartli -t ascii -w 24 -h 8 --first-column-x --data-labels

Per-type examples:

npx chartli data.txt -t ascii -w 24 -h 8
npx chartli data.txt -t spark
npx chartli data.txt -t bars -w 28
npx chartli data.txt -t columns -h 8
npx chartli data.txt -t heatmap
npx chartli data.txt -t unicode
npx chartli data.txt -t braille -w 16 -h 6
npx chartli data.txt -t svg -m lines -w 320 -h 120

Input format

Whitespace-separated numeric rows; optional header row is allowed.

day sales costs profit
1 10 8 2
2 14 9 5
3 12 11 3

When --first-column-x is set, the first numeric column becomes the x-axis labels. If a header row exists, chartli uses the first header cell as the x-axis title and the remaining headers as series labels. For common two-column input, the second header cell becomes the y-axis title.

Repository example assets

  • examples/assets/core-single-series.txt
  • examples/assets/core-multi-series.txt
  • examples/assets/image-data.txt
  • examples/assets/image-columns-variant.txt