chore: import upstream snapshot with attribution

tests/integration/fixture/context_update_test/agent.py

@@ -0,0 +1,43 @@
+# Copyright 2026 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 typing import List
+from typing import Union
+
+from google.adk import Agent
+from google.adk.tools.tool_context import ToolContext
+from pydantic import BaseModel
+
+
+def update_fc(
+    data_one: str,
+    data_two: Union[int, float, str],
+    data_three: list[str],
+    data_four: List[Union[int, float, str]],
+    tool_context: ToolContext,
+):
+  """Simply ask to update these variables in the context"""
+  tool_context.actions.update_state("data_one", data_one)
+  tool_context.actions.update_state("data_two", data_two)
+  tool_context.actions.update_state("data_three", data_three)
+  tool_context.actions.update_state("data_four", data_four)
+
+
+root_agent = Agent(
+    model="gemini-2.5-flash",
+    name="root_agent",
+    instruction="Call tools",
+    flow="auto",
+    tools=[update_fc],
+)