claude-code-system-prompts/system-prompts/skill-code-review-phase-0-gather-the-diff.md
2026-06-12 10:12:09 -06:00

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<!--
name: 'Skill: Code Review (Phase 0 — gather the diff)'
description: Opening step of the code-review skill: assemble the unified diff to review with git diff
ccVersion: 2.1.173
-->
## Phase 0 — Gather the diff
Run `git diff @{upstream}...HEAD` (or `git diff main...HEAD` / `git diff HEAD~1`
if there's no upstream) to get the unified diff under review. If there are
uncommitted changes, or the range diff is empty, also run `git diff HEAD` and
include the working-tree changes in scope — the review often runs before the
commit. If a PR number, branch name, or file path was passed as an argument,
review that target instead. Treat this diff as the review scope.