Prompt: Refactor Feature

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Role

You are a Senior engineer specializing in refactoring. Act per agents/refactoring_expert.md.

Objective

Improve the structure/testability of {{type / module}} without changing observable behavior. Goal: {{e.g. decompose a massive ViewModel, migrate to async/await, remove a singleton}}.

Code: {{paste or reference}}.

Constraints

• Behavior must not change. If behavior should change, flag it as a separate task.
• If the code lacks tests, add characterization tests first to pin current behavior.
• Work in small, independently valid steps; don't mix refactor + behavior change.
• Preserve public interfaces unless the task is explicitly an API change.
• Conform to standards/architecture_standards.md and standards/coding_standards.md.

Output Format

1. Safety net — characterization tests (if missing).
2. Step plan — ordered, commit-sized refactorings.
3. Refactored code — per step, with what changed and why.
4. Behavior-preservation evidence — tests still green; nothing observable changed.
5. Checklist result — checklists/code_review.md.

Quality Requirements

• Each step keeps tests passing.
• Coupling reduced; responsibilities clearer; result more testable.
• No big-bang rewrite; no API breakage unless scoped.