{
  "context": "This criteria evaluates how well the engineer uses IPython's extension system APIs to build a functional extension manager. The focus is on proper usage of extension loading/unloading mechanisms, tracking loaded extensions, and handling the extension lifecycle correctly.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Extension tracking",
      "description": "Uses a data structure (e.g., set or dict) to track which extensions are currently loaded. Should maintain state across load/unload operations.",
      "max_score": 15
    },
    {
      "name": "Dynamic import",
      "description": "Uses importlib.import_module() or equivalent to dynamically import extension modules by name.",
      "max_score": 15
    },
    {
      "name": "Load function call",
      "description": "Correctly retrieves and calls load_ipython_extension() function from the imported module, passing the shell instance if provided.",
      "max_score": 20
    },
    {
      "name": "Unload function call",
      "description": "Correctly retrieves and calls unload_ipython_extension() function from the imported module when unloading.",
      "max_score": 15
    },
    {
      "name": "Already loaded check",
      "description": "Checks if extension is already loaded before loading and returns 'already loaded' string when appropriate.",
      "max_score": 10
    },
    {
      "name": "Not loaded check",
      "description": "Checks if extension is loaded before unloading and returns 'not loaded' string when attempting to unload a non-loaded extension.",
      "max_score": 10
    },
    {
      "name": "Missing function handling",
      "description": "Uses hasattr() or try/except to check for load_ipython_extension() and unload_ipython_extension() functions. Returns 'no load function' or 'no unload function' strings as appropriate.",
      "max_score": 10
    },
    {
      "name": "Reload implementation",
      "description": "Implements reload_extension() by calling unload_extension() followed by load_extension() on the same module.",
      "max_score": 5
    }
  ]
}