# Only ast.parse() is not enough — verify semantic correctness by importing and instantiating

### Rule 7. ast.parse() Is Not Enough

`py_check_syntax` only confirms `ast.parse()` succeeds. Semantic errors (wrong decorator targets, wrong base class, wrong attribute, missing `self`) are NOT caught. After any multi-line edit, ALWAYS:

1. Import the module: `python -c "from src.app_controller import AppController"`
2. Instantiate the class
3. Call the new method in the way it's expected to be called (`ctrl.foo_ts` for a property, `ctrl.foo_ts()` for a method)

If you skip this step, the file passes `py_check_syntax` but blows up at import time or when the new method is called. The 2026-06-05 `_capture_workspace_profile` regression (3-space indent vs 2-space class level) is the canonical example.