fix(telemetry): make strands agent invoke_agent span as INTERNAL spanKind

Author: poshinchen

src/strands/telemetry/tracer.py

@@ -588,7 +588,7 @@ def start_agent_span(
         attributes.update({k: v for k, v in kwargs.items() if isinstance(v, (str, int, float, bool))})
 
         span = self._start_span(
-            f"invoke_agent {agent_name}", attributes=attributes, span_kind=trace_api.SpanKind.CLIENT
+            f"invoke_agent {agent_name}", attributes=attributes, span_kind=trace_api.SpanKind.INTERNAL
         )
         self._add_event_messages(span, messages)
 

tests/strands/telemetry/test_tracer.py

@@ -670,6 +670,7 @@ def test_start_agent_span(mock_tracer):
 
         mock_tracer.start_span.assert_called_once()
         assert mock_tracer.start_span.call_args[1]["name"] == "invoke_agent WeatherAgent"
+        assert mock_tracer.start_span.call_args[1]["kind"] == SpanKind.INTERNAL
         mock_span.set_attribute.assert_any_call("gen_ai.system", "strands-agents")
         mock_span.set_attribute.assert_any_call("gen_ai.agent.name", "WeatherAgent")
         mock_span.set_attribute.assert_any_call("gen_ai.request.model", model_id)