Search code by AST structure using ast-grep. Find semantic patterns like function calls, imports, class definitions instead of text patterns. Triggers on: find all calls to X, search for pattern, refactor usages, find where function is used, structural search, ast-grep, sg.
/plugin marketplace add 0xDarkMatter/claude-mods/plugin install 0xdarkmatter-claude-mods@0xDarkMatter/claude-modsThis skill is limited to using the following tools:
assets/rule-template.yamlreferences/advanced-usage.mdreferences/go-rust-patterns.mdreferences/js-ts-patterns.mdreferences/python-patterns.mdreferences/security-patterns.mdSearch code by its abstract syntax tree (AST) structure. Finds semantic patterns that regex cannot match reliably.
| Tool | Command | Use For |
|---|---|---|
| ast-grep | sg -p 'pattern' | AST-aware code search |
| Pattern | Matches | Example |
|---|---|---|
$NAME | Named identifier | function $NAME() {} |
$_ | Any single node | console.log($_) |
$$$ | Zero or more nodes | function $_($$$) {} |
# 1. Find console.log calls
sg -p 'console.log($_)'
# 2. Find React hooks
sg -p 'const [$_, $_] = useState($_)'
sg -p 'useEffect($_, [$$$])'
# 3. Find function definitions
sg -p 'function $NAME($$$) { $$$ }'
sg -p 'def $NAME($$$): $$$' --lang python
# 4. Find imports
sg -p 'import $_ from "$_"'
sg -p 'from $_ import $_' --lang python
# 5. Find async patterns
sg -p 'await $_'
sg -p 'async function $NAME($$$) { $$$ }'
# 6. Find error handling
sg -p 'try { $$$ } catch ($_) { $$$ }'
sg -p 'if err != nil { $$$ }' --lang go
# 7. Find potential issues
sg -p '$_ == $_' # == instead of ===
sg -p 'eval($_)' # Security risk
sg -p '$_.innerHTML = $_' # XSS vector
# 8. Preview refactoring
sg -p 'console.log($_)' -r 'logger.info($_)'
# 9. Apply refactoring
sg -p 'var $NAME = $_' -r 'const $NAME = $_' --rewrite
# 10. Search specific language
sg -p 'pattern' --lang typescript
| Task | Command |
|---|---|
| Find pattern | sg -p 'pattern' |
| Specific language | sg -p 'pattern' --lang python |
| Replace (preview) | sg -p 'old' -r 'new' |
| Replace (apply) | sg -p 'old' -r 'new' --rewrite |
| Show context | sg -p 'pattern' -A 3 |
| JSON output | sg -p 'pattern' --json |
| File list only | sg -p 'pattern' -l |
| Count matches | sg -p 'pattern' --count |
| Run YAML rules | sg scan |
For complete patterns, load:
./references/js-ts-patterns.md - JavaScript/TypeScript patterns./references/python-patterns.md - Python patterns./references/go-rust-patterns.md - Go and Rust patterns./references/security-patterns.md - Security vulnerability detection./references/advanced-usage.md - YAML rules and tool integration./assets/rule-template.yaml - Starter template for custom rulesCreating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems. Create original algorithmic art rather than copying existing artists' work to avoid copyright violations.
Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.
Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.