diff --git a/google/genai/_interactions/types/interaction.py b/google/genai/_interactions/types/interaction.py
index 41c241f2b..725d88e72 100644
--- a/google/genai/_interactions/types/interaction.py
+++ b/google/genai/_interactions/types/interaction.py
@@ -114,6 +114,12 @@ class AgentConfigFindRequest(BaseModel):
     validation on a single vulnerability.
     """
 
+    model: Optional[str] = None
+    """The name of the model to use for the CodeMender agent.
+
+    One CodeMender session will only use one model.
+    """
+
     session_config: Optional[AgentConfigFindRequestSessionConfig] = None
     """Optional session-specific configurations to override default agent behavior."""
 
@@ -182,6 +188,12 @@ class AgentConfigFixRequest(BaseModel):
     This ID maps to a previously discovered vulnerability.
     """
 
+    model: Optional[str] = None
+    """The name of the model to use for the CodeMender agent.
+
+    One CodeMender session will only use one model.
+    """
+
     session_config: Optional[AgentConfigFixRequestSessionConfig] = None
     """Optional session-specific configurations to override default agent behavior."""
 
diff --git a/google/genai/_interactions/types/interaction_create_params.py b/google/genai/_interactions/types/interaction_create_params.py
index 12d35cc51..c82396355 100644
--- a/google/genai/_interactions/types/interaction_create_params.py
+++ b/google/genai/_interactions/types/interaction_create_params.py
@@ -273,6 +273,12 @@ class AgentConfigFindRequest(TypedDict, total=False):
     validation on a single vulnerability.
     """
 
+    model: str
+    """The name of the model to use for the CodeMender agent.
+
+    One CodeMender session will only use one model.
+    """
+
     session_config: AgentConfigFindRequestSessionConfig
     """Optional session-specific configurations to override default agent behavior."""
 
@@ -341,6 +347,12 @@ class AgentConfigFixRequest(TypedDict, total=False):
     This ID maps to a previously discovered vulnerability.
     """
 
+    model: str
+    """The name of the model to use for the CodeMender agent.
+
+    One CodeMender session will only use one model.
+    """
+
     session_config: AgentConfigFixRequestSessionConfig
     """Optional session-specific configurations to override default agent behavior."""