d3-fundamentals SKILL.md skillB
d3-fundamentals from cxcscmu/skilllearnbench is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cxcscmu/skilllearnbench/d3-fundamentals@git:20260424.d50cf5aPins git:20260424.d50cf5a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cxcscmu/skilllearnbench
- Path
skills/b1-one-shot-claude-haiku-4-5/stock-data-visualization/d3-fundamentals/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260424.d50cf5a, committed Apr 24, 2026
- Size
- 3,097 bytes
- Repository stars
- 91
- License
- MIT
Essential D3.js v6 concepts including selections, scales, SVG basics, and data binding for building interactive visualizations.
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
# D3.js v6 Fundamentals
## Overview
D3.js v6 (Data-Driven Documents) is a JavaScript library for manipulating documents based on data. Essential for creating scalable vector graphics (SVG) visualizations.
## Core Concepts
### 1. Selections
Select DOM elements and bind data to them:
```javascript
// Select elements
d3.select("body") // single element
d3.selectAll(".dots") // multiple elements
// Data binding
d3.selectAll("circle")
.data(dataArray, d => d.id) // bind data with key function
.join( // handle enter/update/exit
enter => enter.append("circle"),
update => update,
exit => exit.remove()
)
```
### 2. Scales
Map data values to visual dimensions:
```javascript
// Linear scale (continuous input → continuous output)
const xScale = d3.scaleLinear()
.domain([0, 100]) // input range
.range([0, width]); // output range
// Other common scales:
const colorScale = d3.scaleOrdinal()
.domain(["A", "B", "C"])
.range(["red", "blue", "green"]);
const sizeScale = d3.scaleSqrt() // square root scale (better for areas)
.domain([0, max])
.range([0, 100]);
```
…Read the whole file at its exact version.
How to install
mdr add cxcscmu/skilllearnbench/d3-fundamentals@sha256:52355d6d75528ecdThe line at the top of this page pins the label git:20260424.d50cf5a, 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.
[](https://markdownregistry.com/a/art_2exez3by4vojqu3w)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Apr 24, 2026.
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3097 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
cxcscmu/skilllearnbench · 91 stars · license MIT · pushed 2026-10-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2exez3by4vojqu3w GET https://markdownregistry.com/api/v1/resolve?ref=cxcscmu/skilllearnbench/d3-fundamentals GET https://markdownregistry.com/api/v1/blob/52355d6d75528ecd6c4c834cc95a137bc4b73f0f34ef4601ffbe825425efdb9d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.