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AGENT_SKILL/file_naming_convention/EXAMPLES.md

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+# Examples: file_naming_convention
+
+## Correct Examples
+
+### File Naming
+- `patient_data.csv` → ❌ (forbidden extension, should be external)
+- `patient_data.json` → ✅ (allowed extension, snake_case)
+- `Dockerfile` → ✅ (UPPER_SNAKE_CASE allowed for root config)
+- `docker-compose.yaml` → ✅ (hyphen allowed exception)
+- `docker-compose.yml` → ✅ (hyphen allowed exception)
+- `package-lock.json` → ✅ (hyphen allowed exception)
+- `yarn.lock` → ✅ (hyphen allowed exception)
+- `pnpm-lock.yaml` → ✅ (hyphen allowed exception)
+- `config.json` → ✅ (snake_case, allowed extension)
+- `api/v1/patient_routes.py` → ✅ (snake_case in path)
+
+### Directory Naming
+- `data_models/` → ✅
+- `api_v2/` → ✅
+- `legacy_data/` → ✅ (but see LEGACY/ rule below)
+
+### LEGACY/ Directory
+```python
+# LEGACY: Temporary fix for migration issue #123
+# TODO: Remove after migration complete
+legacy_code_here()
+```
+→ ✅ (includes required comment)
+
+### Test Files
+```
+src/
+  models/
+    patient_model.py
+tests/
+  models/
+    test_patient_model.py
+```
+→ ✅ (test file mirrors source path)
+
+## Incorrect Examples
+
+### File Naming
+- `PatientData.json` → ❌ (PascalCase, should be snake_case)
+- `patient-data.json` → ❌ (hyphen not allowed except docker-compose and lockfiles)
+- `patient data.json` → ❌ (spaces not allowed)
+- `patient.PDF` → ❌ (forbidden extension)
+- `secret_key.pem` → ❌ (forbidden extension)
+- `package_lock.json` → ❌ (should be package-lock.json with hyphens)
+- `yarn_lock` → ❌ (should be yarn.lock with hyphen and extension)
+- `docker_compose.yaml` → ❌ (should be docker-compose.yaml with hyphens)
+
+### Directory Naming
+- `DataModels/` → ❌ (PascalCase)
+- `data-models/` → ❌ (hyphens not allowed)
+- `data models/` → ❌ (spaces)
+
+### LEGACY/ Directory
+```python
+# Modified legacy function
+def old_function():
+    pass
+```
+→ ❌ (missing `# LEGACY:` comment)
+
+### Test Files
+```
+src/
+  utils/
+    helper.py
+tests/
+  test_helper.py  # ❌ Incorrect: should be tests/utils/test_helper.py
+```
+→ ❌ (test file does not mirror source path)