diff --git a/vertexai/_genai/evals.py b/vertexai/_genai/evals.py
index 33fff12b49..64bdea61a0 100644
--- a/vertexai/_genai/evals.py
+++ b/vertexai/_genai/evals.py
@@ -449,6 +449,95 @@ def _EvaluationRunConfig_to_vertex(
     return to_object
 
 
+def _SessionInput_to_vertex(
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+    to_object: dict[str, Any] = {}
+    if getv(from_object, ["user_id"]) is not None:
+        setv(to_object, ["userId"], getv(from_object, ["user_id"]))
+
+    if getv(from_object, ["state"]) is not None:
+        setv(to_object, ["sessionState"], getv(from_object, ["state"]))
+
+    parameters = {}
+    if getv(from_object, ["app_name"]) is not None:
+        parameters["app_name"] = getv(from_object, ["app_name"])
+
+    if parameters:
+        setv(to_object, ["parameters"], parameters)
+
+    return to_object
+
+
+def _SessionInput_from_vertex(
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+    to_object: dict[str, Any] = {}
+    if getv(from_object, ["userId"]) is not None:
+        setv(to_object, ["user_id"], getv(from_object, ["userId"]))
+
+    if getv(from_object, ["sessionState"]) is not None:
+        setv(to_object, ["state"], getv(from_object, ["sessionState"]))
+
+    parameters = getv(from_object, ["parameters"])
+    if parameters and "app_name" in parameters:
+        setv(to_object, ["app_name"], parameters["app_name"])
+
+    return to_object
+
+
+def _AgentRunConfig_to_vertex(
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+    to_object: dict[str, Any] = {}
+    if getv(from_object, ["session_input"]) is not None:
+        setv(
+            to_object,
+            ["sessionInput"],
+            _SessionInput_to_vertex(getv(from_object, ["session_input"]), to_object),
+        )
+
+    if getv(from_object, ["agent_engine"]) is not None:
+        setv(to_object, ["agentEngine"], getv(from_object, ["agent_engine"]))
+
+    if getv(from_object, ["user_simulator_config"]) is not None:
+        setv(
+            to_object,
+            ["userSimulatorConfig"],
+            getv(from_object, ["user_simulator_config"]),
+        )
+
+    return to_object
+
+
+def _AgentRunConfig_from_vertex(
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+    to_object: dict[str, Any] = {}
+    if getv(from_object, ["sessionInput"]) is not None:
+        setv(
+            to_object,
+            ["session_input"],
+            _SessionInput_from_vertex(getv(from_object, ["sessionInput"]), to_object),
+        )
+
+    if getv(from_object, ["agentEngine"]) is not None:
+        setv(to_object, ["agent_engine"], getv(from_object, ["agentEngine"]))
+
+    if getv(from_object, ["userSimulatorConfig"]) is not None:
+        setv(
+            to_object,
+            ["user_simulator_config"],
+            getv(from_object, ["userSimulatorConfig"]),
+        )
+
+    return to_object
+
+
 def _EvaluationRunInferenceConfig_from_vertex(
     from_object: Union[dict[str, Any], object],
     parent_object: Optional[dict[str, Any]] = None,
@@ -464,7 +553,13 @@ def _EvaluationRunInferenceConfig_from_vertex(
         setv(to_object, ["prompt_template"], getv(from_object, ["promptTemplate"]))
 
     if getv(from_object, ["agentRunConfig"]) is not None:
-        setv(to_object, ["agent_run_config"], getv(from_object, ["agentRunConfig"]))
+        setv(
+            to_object,
+            ["agent_run_config"],
+            _AgentRunConfig_from_vertex(
+                getv(from_object, ["agentRunConfig"]), to_object
+            ),
+        )
 
     if getv(from_object, ["agents"]) is not None:
         setv(to_object, ["agent_configs"], getv(from_object, ["agents"]))
@@ -487,7 +582,13 @@ def _EvaluationRunInferenceConfig_to_vertex(
         setv(to_object, ["promptTemplate"], getv(from_object, ["prompt_template"]))
 
     if getv(from_object, ["agent_run_config"]) is not None:
-        setv(to_object, ["agentRunConfig"], getv(from_object, ["agent_run_config"]))
+        setv(
+            to_object,
+            ["agentRunConfig"],
+            _AgentRunConfig_to_vertex(
+                getv(from_object, ["agent_run_config"]), to_object
+            ),
+        )
 
     if getv(from_object, ["agent_configs"]) is not None:
         setv(to_object, ["agents"], getv(from_object, ["agent_configs"]))