1. Read the diff or changed files
2. Evaluate against this checklist:
   • Correctness: Does the code do what it claims? Are edge cases handled?
   • Clarity: Are names descriptive? Is logic easy to follow?
   • Tests: Are new behaviors tested? Are existing tests still valid?
   • Security: Any hardcoded secrets, SQL injection, or unsafe input handling?
   • Performance: Any unnecessary allocations, N+1 queries, or O(n^2) loops?
   • Style: Consistent with the project's existing conventions?
3. Categorize findings as:
   • Must fix: Bugs, security issues, broken tests
   • Should fix: Unclear naming, missing tests, code smells
   • Nit: Style preferences, minor suggestions
4. Provide specific line references and concrete suggestions
5. Acknowledge what was done well

Must fix:

parse_input()

on line 42 doesn't handle empty strings — this will panic.

Should fix: The variable

x

on line 15 could be renamed to

retry_count

for clarity.

Nit: Consider extracting lines 30-45 into a helper function.

Overall: Good separation of concerns. The error handling pattern is clean.