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ast-grep

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Use when asked to run AST-based structural search, lint, or rewrite of code when regex is too fragile. Not for remote, credential, publish, deploy, or irreversible changes.

.devin/skills/ast-grep/SKILL.md

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# ast-grep

## Contract

| Field | Bound contract |
|---|---|
| Trigger | AST-based modification, structural search, lint, or replacement too fragile for regex. |
| Authority | Reversible local: writes only VCS-tracked source files (search is read-only; rewrites apply only through the helper after dry-run review); rollback is version control. No remote mutation. |
| Side effect | Local file writes through the helper two-pass validate/dry-run/apply flow; no remote, credential, or published mutation. |
| Done | Pattern validated and blast radius reviewed; any rewrite landed at the correct scope (search/lint-only runs are valid). |

## Inputs

- An ast-grep pattern, single-quoted in the shell so `$VAR` reaches ast-grep unexpanded.