enhance toolbox toolset:

1. use async client
2. expose add headers and bind parameters functionality of toolbox tool

PiperOrigin-RevId: 760845486

src/google/adk/tools/toolbox_toolset.py

@@ -12,8 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from typing import Any
+from typing import Callable
 from typing import List
+from typing import Mapping
 from typing import Optional
+from typing import Union
 
 import toolbox_core as toolbox
 from typing_extensions import override
@@ -40,12 +44,22 @@ class ToolboxToolset(BaseToolset):
       server_url: str,
       toolset_name: Optional[str] = None,
       tool_names: Optional[List[str]] = None,
+      auth_token_getters: dict[str, Callable[[], str]] = {},
+      bound_params: Mapping[str, Union[Callable[[], Any], Any]] = {},
   ):
     """Args:
 
       server_url: The URL of the toolbox server.
       toolset_name: The name of the toolbox toolset to load.
       tool_names: The names of the tools to load.
+      auth_token_getters: A mapping of authentication service names to
+        callables that return the corresponding authentication token. see:
+        https://github.com/googleapis/mcp-toolbox-sdk-python/tree/main/packages/toolbox-core#authenticating-tools
+        for details.
+      bound_params: A mapping of parameter names to bind to specific values or
+        callables that are called to produce values as needed. see:
+        https://github.com/googleapis/mcp-toolbox-sdk-python/tree/main/packages/toolbox-core#binding-parameter-values
+        for details.
     The resulting ToolboxToolset will contain both tools loaded by tool_names
     and toolset_name.
     """
@@ -53,9 +67,11 @@ class ToolboxToolset(BaseToolset):
       raise ValueError("tool_names and toolset_name cannot both be None")
     super().__init__()
     self._server_url = server_url
-    self._toolbox_client = toolbox.ToolboxSyncClient(server_url)
+    self._toolbox_client = toolbox.ToolboxClient(server_url)
     self._toolset_name = toolset_name
     self._tool_names = tool_names
+    self._auth_token_getters = auth_token_getters
+    self._bound_params = bound_params
 
   @override
   async def get_tools(
@@ -65,11 +81,21 @@ class ToolboxToolset(BaseToolset):
     if self._toolset_name:
       tools.extend([
           FunctionTool(tool)
-          for tool in self._toolbox_client.load_toolset(self._toolset_name)
+          for tool in await self._toolbox_client.load_toolset(
+              self._toolset_name,
+              auth_token_getters=self._auth_token_getters,
+              bound_params=self._bound_params,
+          )
       ])
     if self._tool_names:
       tools.extend([
-          FunctionTool(self._toolbox_client.load_tool(tool_name))
+          FunctionTool(
+              await self._toolbox_client.load_tool(
+                  tool_name,
+                  auth_token_getters=self._auth_token_getters,
+                  bound_params=self._bound_params,
+              )
+          )
           for tool_name in self._tool_names
       ])
     return tools