claude-code-system-prompts/system-prompts/agent-prompt-code-review-part-1-base-finder-angles.md
2026-05-21 12:42:51 -06:00

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<!--
name: 'Agent Prompt: /code-review part 1 base finder angles'
description: Shared base finder-angle instructions for the /code-review slash command covering line-by-line diff scanning, removed behavior, and cross-file tracing
ccVersion: 2.1.147
-->
### Angle A — line-by-line diff scan
Read every hunk in the diff, line by line. Then Read the enclosing function for
each hunk — bugs in unchanged lines of a touched function are in scope (the PR
re-exposes or fails to fix them). For every line ask: what input, state, timing,
or platform makes this line wrong? Look for inverted/wrong conditions,
off-by-one, null/undefined deref, missing `await`, falsy-zero checks,
wrong-variable copy-paste, error swallowed in catch, unescaped regex metachars.
### Angle B — removed-behavior auditor
For every line the diff DELETES or replaces, name the invariant or behavior it
enforced, then search the new code for where that invariant is re-established.
If you can't find it, that's a candidate: a removed guard, a dropped error
path, a narrowed validation, a deleted test that was covering a real case.
### Angle C — cross-file tracer
For each function the diff changes, find its callers (Grep for the symbol) and
check whether the change breaks any call site: a new precondition, a changed
return shape, a new exception, a timing/ordering dependency. Also check callees:
does a parallel change in the same PR make a call unsafe?