Claude-skill-registry commonmark

Use when parsing or generating Markdown following the CommonMark specification - AST structure, block/inline elements, and extensions

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/commonmark" ~/.claude/skills/majiayu000-claude-skill-registry-commonmark && rm -rf "$T"

manifest: skills/data/commonmark/SKILL.md

CommonMark Markdown

Quick Start

import { Parser, HtmlRenderer } from 'commonmark';

const parser = new Parser();
const renderer = new HtmlRenderer();

const ast = parser.parse('# Hello\n\nWorld');
const html = renderer.render(ast);

AST Node Types

Block Elements

Type	Description
`document`	Root node
`heading`	`#` through `######`
`paragraph`	Text block
`code_block`	Fenced (```) or indented
`block_quote`	`>` prefixed
`list`	Ordered or bullet list
`item`	List item
`thematic_break`	`---` , `***` , `___`

Inline Elements

Type	Description
`text`	Plain text
`emph`	`italic` or `_italic_`
`strong`	`bold` or `__bold__`
`code`	`inline`
`link`	`[text](url)`
`image`	`![alt](src)`
`softbreak`	Line break in source
`hardbreak`	Two spaces + newline

Walking the AST

const walker = ast.walker();
let event;
while ((event = walker.next())) {
  const { node, entering } = event;
  if (node.type === 'heading' && entering) {
    console.log(`H${node.level}: ${node.firstChild?.literal}`);
  }
}

Key Parsing Rules

Blank line separates paragraphs
4-space indent = code block (unless in list)
Fenced code: 3+ backticks, optional info string
Setext headings:
```
===
```
or
```
---
```
underline
Links:
```
[text](url "title")
```
or
```
[text][ref]
```

Extensions (GFM)

GitHub Flavored Markdown adds:

Tables:
```
| col | col |
```
Strikethrough:
```
~~text~~
```
Task lists:
```
- [ ]
```
and
```
- [x]
```
Autolinks: URLs become links automatically

Tips

Use
```
node.literal
```
for text content
Use
```
node.destination
```
for link/image URLs
```
node.info
```
contains fenced code language
Modify AST before rendering for transformations