Refactoring Guru

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Expert Panel

Auto-detected from file content. Python Guru is always active.

Workflow

Phase 0: Scope

1. Read target file completely
2. Identify dependencies (files that import or are imported by target)
3. Assess complexity:
   • High: >300 lines, multiple classes, complex inheritance
   • Medium: 100-300 lines, 1-2 classes, moderate dependencies
   • Low: <100 lines, single class/module, few dependencies
4. Present scope to user and get confirmation before proceeding

Phase 1: Expert Analysis

Python Guru (always):

• Type annotations, Pythonic idioms, error handling
• Naming conventions, keyword-only arguments where appropriate
• Docstring quality (Google style)

Architect (when complex class hierarchies detected):

• SRP violations, class cohesion, God objects
• Missing abstractions, circular imports
• Reference: https://refactoring.guru/refactoring/smells

Document findings per expert as:

### {Expert} Findings
**Issues:** numbered list with severity (High/Medium/Low)
**Recommendations:** numbered list

Phase 2: Pattern Analysis

Read patterns.md. Apply relevant design patterns to identified code smells. For each pattern, show before/after code snippets.

Phase 3: Test Coverage

Before any code changes, ensure refactored code has full test coverage:

1. Run uv run pytest --cov=<module> --cov-report=term-missing on the target module
2. Identify uncovered lines that will be moved, renamed, or restructured
3. Write tests to cover those lines — focus on behavior, not implementation
4. Run the full suite — all green before proceeding

Key tests:

• Characterization tests: deterministic inputs → expected outputs. Guarantee refactoring doesn't change behavior.
• Guard/edge-case tests: empty input, missing data — cover early-return paths that move during refactoring.

Phase 4: Synthesis & Proposal

Read proposal-template.md. Compile all findings into a structured proposal with options.

Phase 5: User Approval

Present proposal. Options:

1. Approve — proceed with implementation
2. Discuss — clarify specific points
3. Modify — adjust scope or approach
4. Cancel — abort refactoring

Do NOT proceed without explicit approval.

Phase 6: Implementation

Critical rules:

• Never mix refactoring with behavior changes. API signature changes, new features, and bug fixes go in separate commits before or after the structural refactoring.
• Each step = one commit with green tests. If something breaks, git revert of a single commit is trivial.
• Run tests after every commit, not just at the end.

Steps:

1. Create feature branch if not already on one
2. Commit behavior/API changes first — separate from structural refactoring
3. Execute structural refactoring iteratively with uv run pre-commit run --files <changed> validation
4. One commit per logical chunk

Phase 7: Finalization

1. Run full verification:

   uv run pre-commit run --all-files
   uv run pytest -x
   

2. Ask user whether to keep .refactoring/{module}.md plan file

Communication

• Speak to user in their language
• Write code and comments in English