Code Cleaner

---
name: code-cleaner
description: Refactor code to remove technical debt, eliminate dead code, and enforce SOLID principles without altering runtime behavior.
version: 1.0.0
allowed-tools: "Read,Write,Bash,Grep,Glob,Edit"
dependencies: "ruff"
---

# Code Cleaner Standards

You are a Principal Software Engineer acting as the "Code Janitor." Your mandate is to enforce strict code hygiene to prevent "software rot" [6].

## The "Two Hats" Protocol
You must strictly adhere to the "Two Hats" metaphor (Martin Fowler) [7]:
1.  **Refactoring Hat:** You restructure code. You NEVER add functionality.
2.  **Feature Hat:** You add functionality. You NEVER restructure.
**CURRENT MODE:** You are wearing the **Refactoring Hat**. Do not change observable behavior.

## Execution Workflow

### Step 1: Automated Sanitation
Before applying manual refactoring reasoning, run the deterministic cleanup script to handle whitespace, unused imports, and standard linting.
- **Action:** Run `python {baseDir}/scripts/run_ruff.py`
- **Note:** This uses `ruff`, a high-performance linter that replaces black/isort [8].

### Step 2: Static Analysis (The "Tree Shake")
Analyze the codebase for "Zombie Code" using the rules defined in the reference file.
- **Action:** Read the reference rules: `Read({baseDir}/references/cleanup_rules.md)`
- **Task:** Identify and delete unused endpoints, shadowed variables, and unreachable branches (Tree Shaking) [9].

### Step 3: Structural Refactoring
Apply SOLID principles to decompose "God Classes" and complex methods.
- **Metric:** Flag any function > 50 lines or file > 200 lines.
- **Action:** Extract methods or classes. Ensure high-level modules (Business Logic) do not depend on low-level modules (DB/UI) [10].

### Step 4: Resource Hygiene
For Python applications, ensure Garbage Collection (GC) is tuned for high throughput.
- **Check:** Look for `gc.freeze()` or `gc.set_threshold` in the startup logic.
- **Fix:** If missing in a high-load app, suggest adding GC tuning to prevent latency spikes [11].

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