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GitHub-Flavored Markdown
gfm
Use when writing or reviewing GitHub-flavored Markdown (README, issues, PRs, docs)
SKILL.md
Full skill instructions
GitHub-Flavored Markdown
Arguments
$ARGUMENTS
Instructions
Parse arguments to determine task:
- File path → Write/edit markdown file
- "review" → Audit existing markdown for GFM best practices
- Topic/description → Draft markdown content
Writing Guidelines
Structure:
- Use heading hierarchy (
#through######)—GitHub auto-generates TOC for 2+ headings - Prefer ATX headings (
#) over Setext (===) - One blank line before headings
Text styling:
| Style | Syntax |
|---|---|
| Bold | **text** |
| Italic | _text_ |
| Bold+italic | ***text*** |
| Strikethrough | ~~text~~ |
| Code | `code` |
| Subscript | <sub>x</sub> |
| Superscript | <sup>2</sup> |
Code blocks:
```language
code here
```
Lists:
- Unordered: use
-consistently - Ordered:
1.,2., etc. - Task lists:
- [ ]incomplete,- [x]complete - Nest by aligning under parent text
Links:
- Inline:
[text](url) - Section anchors:
[text](#heading-name)(lowercase, hyphens, no punctuation) - Relative paths for repo files:
docs/CONTRIBUTING.md
Images:  — always include alt text
Alerts (callouts):
> [!NOTE]
> Useful information
> [!TIP]
> Helpful advice
> [!IMPORTANT]
> Essential info
> [!WARNING]
> Urgent attention
> [!CAUTION]
> Risk warning
Footnotes:
Text with footnote[^1].
[^1]: Footnote content.
Color swatches: `#FF5733`, `rgb(255,87,51)`, `hsl(11,100%,60%)`
Review Checklist
When reviewing markdown:
- Heading hierarchy is logical (no skipped levels)
- Code blocks specify language for syntax highlighting
- Links use relative paths for repo files
- Images have meaningful alt text
- Task lists use proper syntax
- Alerts use correct
> [!TYPE]format - No trailing whitespace except intentional line breaks
- Tables are properly aligned
Examples
/gfm README.md → Edit/create README
/gfm review docs/ → Audit markdown files in docs/
/gfm API documentation → Draft API docs content
/gfm changelog entry → Write changelog in GFM style
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