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code-review

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by langchain-ai · part of langchain-ai/deepagents

Perform a structured code review of changes, checking for correctness, style, tests, and potential issues.

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🧩 One of 7 skills in the langchain-ai/deepagents package — works on its own, and pairs well with its siblings.

This is the playbook your agent receives when the skill activates — you don't need to read it to use the skill, but it's here to audit before installing.

Code Review Skill

Use this skill after implementing changes to validate your work before delivering.

Review Checklist

1. Correctness

  • Changes solve the original issue/task
  • No unintended side effects on existing functionality
  • Edge cases are handled
  • Error handling is appropriate (not excessive)

2. Code Quality

  • Code matches existing style and patterns
  • No unnecessary complexity or abstraction
  • Variable and function names are clear
  • No dead code, commented-out code, or TODOs left behind

3. Tests

  • New functionality has test coverage
  • Existing tests still pass
  • Tests cover both happy path and error cases
  • Tests are not brittle (don't test implementation details)

4. Safety

  • No hardcoded secrets or credentials
  • User input is validated at boundaries
  • No SQL injection, XSS, or command injection vectors
  • File operations use safe paths

Process

  1. Read each modified file end-to-end (not just the diff)
  2. Run the test suite: execute("python -m pytest -v")
  3. Run linters if available: execute("ruff check .")
  4. Run the bundled lint check: execute("python /skills/code-review/lint_check.py .")
  5. Check against each item in the review checklist
  6. If any issues found, fix them and re-review
  7. When everything passes, the review is complete

Helper Scripts

  • /skills/code-review/lint_check.py — Scans Python files for missing docstrings, long functions (>50 lines), and bare except: clauses. Run it via execute("python /skills/code-review/lint_check.py [path ...]").