chore: Improve hint message in agent loader

PiperOrigin-RevId: 822216833

Author: GWeale

src/google/adk/cli/utils/agent_loader.py

@@ -241,10 +241,10 @@ def _perform_load(self, agent_name: str) -> Union[BaseAgent, App]:
  or agents_path.joinpath("root_agent.yaml").is_file()
  ):
  hint = (
- "\n\nHINT: It looks like you might be running 'adk web' from inside"
- " an agent directory. Try running 'adk web .' from the parent"
- " directory that contains your agent folder, not from within the"
- " agent folder itself."
+ "\n\nHINT: It looks like this command might be running from inside an"
+ " agent directory. Run it from the parent directory that contains"
+ " your agent folder (for example the project root) so the loader can"
+ " locate your agents."
  )
 
  raise ValueError(