Refactor

Use this template to refactor legacy code toward a stated goal, with safety.

INPUTS

• PROJECT_CONTEXT
• LEGACY_CODE
• REFACTOR_GOAL // e.g., improve readability, adopt a pattern, reduce coupling
• (optional) CONSTRAINTS

INSTRUCTIONS

1. Restate REFACTOR_GOAL and constraints. Preserve behavior.
2. Propose a target design (patterns, boundaries, contracts).
3. Provide a refactored version or representative slices.
4. Explain rationale trade-offs (perf, readability, testability).
5. Add safety checks: tests, metrics, and rollout steps.
6. Show an incremental plan of small commits.
7. Keep lines ≤80 chars.

OUTPUT FORMAT

Goal & constraints

• Goal:
• Constraints:

Diagnosis

• Smells:
• Risks:

Target design

• Patterns:
• Module boundaries:
• Public interfaces:

Refactored code (slice)

- old
+ new

Rationale

• Why this is better:
• Alternatives considered:

Safety & verification

• Regression tests:
• Contracts/property checks:
• Perf baselines:
• Observability:

Incremental plan

1. ...
2. ...

Backout plan

• How to revert safely:

Follow-ups

• ...