fix: Disable bound token sharing for GCP services in ADK templates.

PiperOrigin-RevId: 901408387

Author: vertex-sdk-bot

vertexai/agent_engines/templates/adk.py

@@ -806,6 +806,12 @@ def set_up(self):
         from google.adk.memory.in_memory_memory_service import InMemoryMemoryService
 
         os.environ["GOOGLE_GENAI_USE_VERTEXAI"] = "1"
+        # --- BEGIN BOUND TOKEN PATCH ---
+        # Set GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES to false
+        # to disable bound token sharing.
+        os.environ["GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES"] = (
+            "false"
+        )
         project = self._tmpl_attrs.get("project")
         if project:
             os.environ["GOOGLE_CLOUD_PROJECT"] = project