feat(agent): add debug log message on agent initialization

src/strands/agent/agent.py

@@ -278,6 +278,8 @@ def __init__(
                 self.hooks.add_hook(hook)
         self.hooks.invoke_callbacks(AgentInitializedEvent(agent=self))
 
+        logger.debug("agent_id=<%s>, name=<%s> | agent initialized", self.agent_id, self.name)
+
     @property
     def system_prompt(self) -> str | None:
         """Get the system prompt as a string for backwards compatibility.

test_output.log

@@ -0,0 +1 @@
+/bin/sh: 1: hatch: not found

tests/strands/agent/test_agent.py

@@ -288,6 +288,18 @@ def test_agent__init__invalid_id(agent_id):
         Agent(agent_id=agent_id)
 
 
+def test_agent__init__logs_debug_message(mock_model, caplog):
+    import logging
+
+    with caplog.at_level(logging.DEBUG, logger="strands.agent.agent"):
+        agent = Agent(model=mock_model, agent_id="test-agent-123", name="TestAgent")
+
+    assert any("agent initialized" in record.message for record in caplog.records)
+    assert any("agent_id=<test-agent-123>" in record.message for record in caplog.records)
+    assert any("name=<TestAgent>" in record.message for record in caplog.records)
+    assert agent.agent_id == "test-agent-123"
+
+
 def test_agent__call__(
     mock_model,
     system_prompt,