Convert Session To Invocation.

PiperOrigin-RevId: 758356942

src/google/adk/evaluation/eval_case.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-from typing import Any, Optional
+from typing import Any, Optional, Tuple
 
 from google.genai import types as genai_types
 from pydantic import BaseModel
@@ -26,9 +26,16 @@ class IntermediateData(BaseModel):
   tool_uses: list[genai_types.FunctionCall]
   """Tool use trajectory in chronological order."""
 
-  intermediate_responses: list[genai_types.Part]
+  intermediate_responses: list[Tuple[str, list[genai_types.Part]]]
   """Intermediate responses generated by sub-agents to convey progress or status
-  in a multi-agent system, distinct from the final response."""
+  in a multi-agent system, distinct from the final response.
+
+  This is expressed as a Tuple of:
+    - Author: Usually the sub-agent name that generated the intermediate
+      response.
+
+    - A list of Parts that comprise of the response.
+  """
 
 
 class Invocation(BaseModel):