Use when creating, reviewing, or styling charts, graphs, dashboards, sparklines, or any data visualization.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Tufte Data Visualization
Apply Edward Tufte's principles whenever generating or reviewing code that renders data visually. This skill covers chart generation, not slide/presentation design.
## Workflow
Follow these steps in order when creating any chart:
### Step 1: Identify the message
Before writing code, determine:
1. The key finding or trend the chart must make visible.
2. The comparison context — a baseline, prior period, target, or peer group. A number without context is meaningless.
3. The chart type that best fits the data structure (see Chart type guidance below).
### Step 2: Apply universal rules
Review the rules below. Every rule is a default — deviate only when the user explicitly requests otherwise.
### Step 3: Validate
Run through the validation checklist at the bottom of this file before presenting the chart.
---
## Universal rules
Rules 1–14 cover static principles; 15–19 extend them for screens; 20–22 address content and formatting.
### 1. Remove top and right borders
No chart should have top or right axis lines, borders, or spines. The bottom and left axes are sufficient. Top and right lines are pure chartjunk.
### 2. Direct labels, not legends
…
The line at the top of this page pins the label git:20260918.7a11459, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_b3mockv7xe2yuym5
GET https://markdownregistry.com/api/v1/resolve?ref=bdsqqq/dots/data-visualization
GET https://markdownregistry.com/api/v1/blob/0df9dcf8cd5cb92fd105754c552e2f68a0a0d5a106d8cb51b1c3dafd55e5db95
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