feat(tool): tool_error_notifier

src/google/adk/tools/__init__.py

@@ -28,6 +28,7 @@
 from .tool_context import ToolContext
 from .transfer_to_agent_tool import transfer_to_agent
 from .vertex_ai_search_tool import VertexAiSearchTool
+from .tool_error_notifier import tool_error_notifier
 
 __all__ = [
     'APIHubToolset',
@@ -45,4 +46,5 @@
     'preload_memory',
     'ToolContext',
     'transfer_to_agent',
+    'tool_error_notifier',
 ]

src/google/adk/tools/tool_error_notifier.py

@@ -0,0 +1,45 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from functools import wraps
+
+
+def tool_error_notifier(target_exception):
+    """
+    A decorator that wraps a tool function and catches a specific exception.
+    If the specified exception occurs, it returns True, signaling an error
+    back to the LLM agent.
+
+    Args:
+        target_exception (Type[Exception]): The exception class to catch.
+
+    Returns:
+        Callable: A decorated function that returns True if the specified
+        exception is raised, otherwise returns the function result.
+    """
+    def _decorator(func):
+        @wraps(func)
+        def _wrapper(*args, **kwargs):
+            try:
+                return func(*args, **kwargs)
+            except target_exception as e:
+                return {
+                    {
+                        "status": "error",
+                        "error": e.__class__.__name__,
+                        "message": str(e)
+                    }
+                }
+        return _wrapper
+    return _decorator