diff --git a/src/google/adk/tools/mcp_tool/mcp_tool.py b/src/google/adk/tools/mcp_tool/mcp_tool.py
index 04ed799b17..147f71bd15 100644
--- a/src/google/adk/tools/mcp_tool/mcp_tool.py
+++ b/src/google/adk/tools/mcp_tool/mcp_tool.py
@@ -18,6 +18,7 @@
 import base64
 import inspect
 import logging
+import os
 from typing import Any
 from typing import Callable
 from typing import Dict
@@ -169,6 +170,16 @@ def __init__(
     Raises:
         ValueError: If mcp_tool or mcp_session_manager is None.
     """
+
+    # --- BEGIN BOUND TOKEN PATCH ---
+    # Set GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES to false
+    # to disable bound token sharing. Tracking on
+    # https://github.com/google/adk-python/issues/5361
+    os.environ["GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES"] = (
+        "false"
+    )
+    # --- END BOUND TOKEN  PATCH ---
+
     super().__init__(
         name=mcp_tool.name,
         description=mcp_tool.description if mcp_tool.description else "",
@@ -178,6 +189,7 @@ def __init__(
         if auth_scheme
         else None,
     )
+
     self._mcp_tool = mcp_tool
     self._mcp_session_manager = mcp_session_manager
     self._require_confirmation = require_confirmation
diff --git a/src/google/adk/tools/mcp_tool/mcp_toolset.py b/src/google/adk/tools/mcp_tool/mcp_toolset.py
index 4f197701e8..5c55328878 100644
--- a/src/google/adk/tools/mcp_tool/mcp_toolset.py
+++ b/src/google/adk/tools/mcp_tool/mcp_toolset.py
@@ -17,6 +17,7 @@
 import asyncio
 import base64
 import logging
+import os
 import sys
 from typing import Any
 from typing import Awaitable
@@ -158,6 +159,15 @@ def __init__(
       sampling_capabilities: Optional capabilities for sampling.
     """
 
+    # --- BEGIN BOUND TOKEN PATCH ---
+    # Set GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES to false
+    # to disable bound token sharing. Tracking on
+    # https://github.com/google/adk-python/issues/5361
+    os.environ["GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES"] = (
+        "false"
+    )
+    # --- END BOUND TOKEN  PATCH ---
+
     super().__init__(tool_filter=tool_filter, tool_name_prefix=tool_name_prefix)
 
     self._sampling_callback = sampling_callback