Coding with Claude Sonnet 5: Developer Workflow Guide
How developers can use Claude Sonnet 5 for code review, refactoring, implementation planning, debugging, and Claude Code workflows.
TL;DR
Claude Sonnet 5 is useful for developers because it fits the full engineering loop: understand, plan, implement, test, and review. The best results come from treating it like a disciplined collaborator, not a one-shot code generator.
Step 1: Load Context Deliberately
Do not begin with "fix this bug" if the model lacks context. Start by providing:
- Relevant files
- Error logs
- Existing tests
- Constraints
- The intended behavior
Ask Claude Sonnet 5 to summarize what it sees before making changes. This catches misunderstandings early.
Step 2: Ask for a Plan First
Use a prompt like:
"Before writing code, propose an implementation plan. Include files to change, risks, tests to add, and any assumptions."
This separates design from execution. It also gives you a clean review point before the model starts producing code.
Step 3: Make Small Changes
For refactors or feature work, split tasks:
- Identify affected files
- Modify one area at a time
- Run or update tests
- Review the diff
- Continue only after the previous step is coherent
Small changes reduce the cost of model mistakes and make human review easier.
Step 4: Use It for Testing
Claude Sonnet 5 is especially valuable for test planning. Ask for a test matrix:
- Happy path
- Empty input
- Invalid input
- Permission failure
- External service failure
- Race conditions
- Regression cases
Then ask it to write the tests in the repository's existing style.
Step 5: Run a Review Pass
Ask for review by dimension:
- Correctness
- Security
- Performance
- Maintainability
- Test coverage
Require concrete file references and suggested fixes. Vague review comments are not useful.
Where It Helps Most
Sonnet 5 is a strong fit for:
- Pull request review summaries
- Debugging with logs
- Refactoring plans
- Test generation
- API endpoint implementation
- Documentation from code
- Migration checklists
Developer Rule of Thumb
Use Claude Sonnet 5 to increase your leverage, not to outsource judgment. Read generated code, run tests, and keep human ownership for security, data deletion, authentication, payment, and permission logic.