---
name: codebase-audit
description: Codebase audit + refactoring workflow. Dead code detection, God Object splitting, duplicate function removal, design flaw identification, frontier comparison verification. Triggered by "audit" ("감사"), "dead code" ("데드코드"), "refactor" ("리팩토링"), "god object", "duplication" ("중복"), "design flaw" ("설계 결함") keywords.
---

# Codebase Audit & Refactoring Workflow

A systematic workflow for auditing and improving the entire codebase.
Proven in the GEODE v0.24.0 session (3,205 lines reduced, __init__.py -57%).

## Workflow

```text
1. Audit
   → Dead code + duplicates + God Object + Parameter Bloat detection
2. Triage
   → Verdict: candidate / refactoring / defer, backed by caller evidence
3. Kanban Registration
   → Register in Backlog by priority
4. Workspace Isolation
   → Worktree isolation
5. Implementation + Verification
   → Delete/extract/convert then lint + test
6. Docs-sync + main
   → CHANGELOG, progress.md, global reinstall
```

## Phase 1: Audit

### Dead Code Detection

```bash
# Check import status per module
for f in $(find core/ -name "*.py" -not -name "__init__.py" -not -path "*__pycache__*"); do
    basename=$(basename $f .py)
    # Check using actual import path (basename match alone causes false positives)
    module_path=$(echo $f | sed 's/\.py$//' | tr '/' '.')
    count=$(grep -rn "from ${module_path}\|import ${module_path}" core/ --include="*.py" | grep -v "$f" | wc -l)
    if [ "$count" -eq 0 ]; then
        echo "DEAD: $f ($(wc -l < $f) lines)"
    fi
done
```

Note: Search by **full module path**, not basename, to prevent false positives.

### Duplicate Function Detection

```bash
grep -rn "^def " core/ --include="*.py" | awk -F: '{split($NF,a," "); print a[2]}' | sort | uniq -c | sort -rn | head -10
```

Repeated names are discovery candidates, not proof of duplication. Trace full
call paths and compare behavior; protocol methods and local helpers commonly
share names legitimately.

### God Object Detection (Kent Beck criteria)

```bash
find core/ -name "*.py" -not -path "*__pycache__*" -exec wc -l {} + | sort -rn | head -10
```

- Large files are candidates for responsibility tracing, not automatic splits.
- `grep -c "^def " FILE` to determine the number of responsibilities

### Parameter Bloat Detection

```bash
grep -rn "def __init__" core/ --include="*.py" -A20 | grep -B1 "def __init__" | head -20
# Review call-site cohesion; parameter count alone is not a finding.
```

## Phase 2: Triage

| Classification | Criteria | Action |
|----------------|----------|--------|
| **Deletion candidate** | No textual imports found | Apply the agent anti-pattern deletion gate |
| **Refactoring** | Multiple proven responsibilities or drift paths | Use the smallest extraction that removes the failure |
| **Defer** | Planned for future use, or requires large-scale changes | Kanban Backlog |

## Phase 3: Module Extraction Patterns

### Circular Import Prevention

```python
# When the new module references a function from the original module → deferred import
def extracted_function():
    from core.cli import _original_helper  # lazy import inside function
    return _original_helper()
```

### Thin Wrapper (Delegation Function)

When the original module must continue exporting the extracted function:

```python
# core/cli/__init__.py
def _build_tool_handlers(**kwargs):
    """Delegate to tool_handlers (single source)."""
    from core.cli.tool_handlers import _build_tool_handlers as _build
    return _build(**kwargs)
```

### re-export (ruff F401 prevention)

```python
from core.cli.pipeline_executor import _run_analysis as _run_analysis  # explicit re-export
```

## Phase 4: Verification

```bash
# 1. Lint
uv run ruff check core/

# 2. Type check (changed files only)
uv run mypy core/cli/__init__.py core/cli/new_module.py

# 3. Full test suite
uv run pytest tests/ -m "not live" -q

# 4. Preserve a surviving test for each behavior or invariant after deletion
```

## GEODE Proven Results

| Task | Lines Reduced |
|------|---------------|
| Inline handler deletion (dead code) | -898 lines |
| 6 dead modules deleted | -1,243 lines |
| 5 dead tests deleted | -1,064 lines |
| God Object splitting (pipeline_executor + report_renderer) | -786 lines |
| **Total** | **-3,991 lines** |

## Anti-patterns

1. **Searching imports by basename** → false positives (e.g., "repl" matching the string "REPL")
2. **Treating shared names as duplicate behavior** → trace callers before changing either implementation
3. **Not deleting originals after refactoring** → the most dangerous pattern; old version called from serve, leading to lengthy debugging
4. **Assuming `uv tool install . --force` is sufficient** → `--reinstall` may be required in some cases

For dead-code or test-deletion decisions, follow
`.agents/skills/agent-anti-pattern/references/field-guide.md`. Zero textual
imports, file size, parameter count, and test-only callers are insufficient on
their own; check entrypoints, registries, public exports, persisted state, and
compatibility contracts first.