chart-visualization

name	Chart Visualization
description	Render research-style PNG charts for trends, comparisons, distributions, and scatter relationships when a visual materially improves the answer
when_to_use	Use when the user asks for a chart, plot, visualization, trend line, bar chart, histogram, scatter plot, or when a numeric answer is easier to understand as a visual
aliases	["chart visualization","chart","plot","visualize","trend chart"]
allowed-tools	["skill_tool"]
user-invocable	true
context	inline
arguments	["spec_json"]
script	scripts/render_chart.py
shell	python3

Chart Visualization

Use this skill when a chart will materially improve the answer. Do not render a chart just because it is possible.

Invocation

On native Codex, resolve this skill's directory from the disclosed SKILL.md path and run the bundled script directly:

python3 <skill-dir>/scripts/render_chart.py '<JSON chart spec>'

Parse the script's JSON stdout and use the returned artifacts path. On a legacy Hone runner without native skill execution, call:

skill_tool(
  skill_name="chart_visualization",
  execute_script=true,
  script_arguments={"spec_json":"<JSON chart spec>"}
)

The script expects one JSON object string as spec_json.

Required Spec Fields

• chart_type
• title
• series

Optional Spec Fields

• subtitle
• x_label
• y_label
• x_values
• annotations
• footnotes
• palette
• output_name

Supported Chart Types

• line
• area
• bar
• scatter
• histogram
• horizontal_bar

Series Shape

Each series item should usually be:

{
  "name": "Revenue",
  "values": [100, 120, 135]
}

You may optionally add a .