Best Claude prompts for code review and debugging

1. 1 · Coding · attach screenshot or file Find and fix a bug from an error message
   Paste the error and get the root cause, not a guess.
2. 2 · Coding · attach file Write tests for a file
   Adds meaningful unit tests that cover edge cases, not just the happy path.
3. 3 · Coding · attach file Review my pull request like a senior engineer
   A thorough, prioritized code review of a diff.
4. 4 · Coding · attach file Debug why my app is slow
   Find the real bottleneck before optimizing.
5. 5 · Coding Debug a failing test suite
   Get the suite green without hiding real bugs.
6. 6 · Coding Add logging and error tracking
   See what's happening in production.
7. 7 · Coding · attach screenshot Turn a screenshot of an error into a fix
   Screenshot your error dialog or console and get the fix.
8. 8 · Coding · attach screenshot Turn a screenshot of an error dialog into a fix
   Snap the error on screen and get the likely cause and exact steps to fix it.
9. 9 · Coding · attach file Write unit tests for my code
   Tests that cover real edge cases.
10. 10 · Coding Explain an error message and fix it
    From stack trace to fix.
11. 11 · Coding Software QA tester
    Tests an app's functionality and performance against its requirements and writes clear bug reports.
12. 12 · Coding Code review with improvement suggestions
    Reviews a code block or file for bugs, readability and performance and explains each suggestion.
13. 13 · Coding Thorough code review assistant
    A structured code review: bugs, security issues, performance, style and a summary of what to fix first.
14. 14 · Coding Fix a bug test-first
    A strict protocol for coding agents: reproduce the bug with failing tests, fix it, then prove the fix.
15. 15 · Coding Debugging detective
    A senior engineer's method for finding the root cause of a bug instead of just patching symptoms.
16. 16 · Coding Review an API change for breaking changes
    Reviews an API or OpenAPI diff for breaking changes and drafts a migration checklist.
17. 17 · Coding Senior code review ranked by severity
    A meticulous code review with findings sorted from critical to minor.

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