refactor(mcp_client): migrate L1338 py_get_hierarchy to Result[T] (Phase 7 site 1)

src/mcp_client.py

@@ -1302,41 +1302,16 @@ def py_check_syntax(path: str) -> str:
  return "; ".join(e.ui_message() for e in resolved.errors)
 
 def py_get_hierarchy(path: str, class_name: str) -> str:
- """Scans the project to find subclasses of a given class."""
- p, err = _resolve_and_check(path)
- if err: return err
- assert p is not None
- subclasses: list[str] = []
+ """Scans the project to find subclasses of a given class.
 
- def _search_file(fp: Path) -> None:
-  if not _is_allowed(fp): return
-  try:
-   code = fp.read_text(encoding="utf-8")
-   tree = ast.parse(code)
-   for node in ast.walk(tree):
-    if isinstance(node, ast.ClassDef):
-     for base in node.bases:
-      if isinstance(base, ast.Name) and base.id == class_name:
-       subclasses.append(f"{fp.name}: class {node.name}({class_name})")
-      elif isinstance(base, ast.Attribute) and base.attr == class_name:
-       if isinstance(base.value, ast.Name):
-        subclasses.append(f"{fp.name}: class {node.name}({base.value.id}.{class_name})")
-  except Exception:
-   pass
- try:
-  if p.is_file():
-   _search_file(p)
-  else:
-   for root, dirs, files in os.walk(p):
-    dirs[:] = [d for d in dirs if not d.startswith('.') and d not in ('__pycache__', 'venv', 'env')]
-    for file in files:
-     if file.endswith('.py'):
-      _search_file(Path(root) / file)
-  if not subclasses:
-   return f"No subclasses of '{class_name}' found in {p}"
-  return f"Subclasses of '{class_name}':\n" + "\n".join(f"  - {s}" for s in subclasses)
- except Exception as e:
-  return f"ERROR finding subclasses of '{class_name}': {e}"
+ Thin wrapper over py_get_hierarchy_result; the legacy str shape is
+ preserved for backward compatibility, but the try/except Exception
+ lives in the Result variant.
+ """
+ resolved = py_get_hierarchy_result(path, class_name)
+ if resolved.ok:
+  return resolved.data
+ return "; ".join(e.ui_message() for e in resolved.errors)
 
 def py_get_docstring(path: str, name: str) -> str:
  """Extracts the docstring for a specific module, class, or function."""