Data Visualization

A guide to choosing and designing charts that explain data clearly. It covers bar charts for category comparisons, line charts for trends, scatter plots for relationships, and heatmaps for two-dimensional patterns.

In plain words
What is it for?
Use it to choose charts for rankings, time trends, correlations, category comparisons, and patterns across two dimensions, then apply basic readability rules.
Why use it?
It helps match the chart to the question being asked and avoid displays that are difficult to read. Its practices address sorting, labels, scales, colors, limits, and outliers.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/saolalab/clawforce/visualization
Any agent
npx skills add saolalab/clawforce --skill visualization
Clone the repo
git clone --depth 1 https://github.com/saolalab/clawforce

Made for: Claude Code, Codex.

Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,481 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00016 $0.01481
Opus 5 $0.00008 $0.00740
Sonnet 5 $0.00003 $0.00296
Haiku 4.5 $0.00002 $0.00148

Measured yesterday against content hash 6e09b5c30d5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Data Visualization scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

marketplace/roles/data-analyst/workspace/skills/visualization/SKILL.md · 232 lines

How it starts

The opening of the file, as written. The whole thing — 232 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Data Visualization Skill

Chart Selection Guide

Bar Chart

Use when:

  • Comparing categories
  • Showing rankings
  • Displaying discrete data

Best practices:

  • Sort bars by value (descending) unless natural order exists
  • Use horizontal bars for long category names
  • Limit to ~10 categories for readability
  • Use consistent colors

Example: Product sales by category, user signups by region

Line Chart

Use when:

  • Showing trends over time
  • Displaying continuous data
  • Comparing multiple series

Best practices:

  • Use time on x-axis
  • Limit to 3-5 lines for clarity
  • Use distinct colors/styles
  • Mark important events/annotations

Example: Daily active users over time, revenue trends

Scatter Plot

Use when:

  • Showing relationships between two variables
  • Identifying correlations
  • Finding outliers

Best practices:

  • Use appropriate axis scales
  • Add trend line if relationship exists
  • Color-code by category if relevant
  • Label outliers

Example: Price vs. demand, user engagement vs. retention

Heatmap

Use when:

  • Showing patterns in two dimensions
  • Comparing categories across time
  • Displaying correlation matrices

Best practices:

  • Use intuitive color scale (low to high)
  • Include values in cells if space allows
  • Sort rows/columns meaningfully
  • Use diverging colors for centered data

Example: User activity by hour/day, correlation matrix

Pie Chart

Use when:

  • Showing parts of a whole
  • Few categories (3-5 max)

Best practices:

  • Limit to 5-7 slices
  • Sort slices by size
  • Use distinct colors
  • Consider bar chart alternative

Example: Market share, revenue by segment

Histogram

Use when:

  • Showing distribution of continuous data
  • Identifying skewness
  • Understanding data shape

Best practices:

  • Choose appropriate bin size
  • Use consistent bin widths
  • Label axes clearly
  • Overlay distribution curve if helpful

Example: User age distribution, transaction amount distribution

Read the full file on GitHub · 232 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 232 lines · 16 tokens per session scan A 6e09b5c30d5d

Subscribe to this mod's changes

Data Visualization is a skill published in the GitHub repository saolalab/clawforce (38 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 16 tokens to every session and 1,481 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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