Writes ast-grep rules to search codebases using Abstract Syntax Tree patterns.
npx skills add https://github.com/dallascrilley/dowser --skill ast-grep-dallascrilley
Please help me install this Agent Skill. Skill: ast-grep Source: https://github.com/dallascrilley/dowser/tree/main/skills/ast-grep Command: npx skills add https://github.com/dallascrilley/dowser --skill ast-grep-dallascrilley
ast-grep scan --stdin or rule files, then run verified rules across the entire codebase. - AST Debugging: Use --debug-query=cst to inspect the concrete syntax tree and find correct node kind values when rules fail to match. - Use Case: Ask to find all async functions that use await but lack try-catch blocks, and the Skill builds, tests, and runs a composite ast-grep rule across your project. ## Quick Start Ask Claude to use ast-grep to find all async functions in this project that use await but do not have try-catch error handling.High-intent search queries and answers about installing and using this skill.
Use ast-grep, which matches code against Abstract Syntax Tree patterns rather than raw text. Write a YAML rule with pattern or kind fields, test it against example code with ast-grep scan, then run it across your codebase.
Create a rule with kind set to function_declaration and a has relational rule matching the pattern await $EXPR with stopBy set to end. Test it with ast-grep scan --rule your_rule.yml against a sample file before searching the full project.
ast-grep supports many languages including JavaScript, TypeScript, Python, Rust, Go, Java, C, C++, Ruby, and PHP. Rules are written per language by specifying the language field in the YAML rule file.
Common causes include missing stopBy: end on relational rules, incorrect node kind values, or metavariables not being the only content in their AST node. Use --debug-query=cst to inspect the actual tree structure and simplify the rule into smaller sub-rules.
Use ast-grep when matches depend on code structure, such as calls inside class methods or functions missing try-catch blocks. Plain text search is sufficient for literal strings but cannot express relational or composite structural conditions.
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