初始化demo

agent_demo/hooks/logging_hook.py

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+import logging
+from typing import Any
+
+from strands.hooks import BeforeToolCallEvent, HookProvicer, HookRegistry
+
+logger = logging.getLogger("agent_demo.hooks")
+
+class ToolLoggingHook(HookProvicer):
+    """A hook that logs tool calls and their results."""
+
+    def register(self, registry: HookRegistry, **kwargs: Any) -> None:
+        registry.add_callback(BeforeToolCallEvent, self._on_before_tool)
+        
+    def _on_before_tool(self, event: BeforeToolCallEvent) -> None:
+        tool_use = getattr(event, "tool_use", None) or {}
+        
+        name = tool_use.get("name") if isinstance(tool_use, dict) else None
+        logger.info("[hook] about to call tool: %s", name or "<unknown>")
+        
+
+def default_hooks() -> list:
+    """Hooks registered on every agent by default. Add consent/audit hooks here."""
+    return [ToolLoggingHook()]