chore: import upstream snapshot with attribution

contributing/samples/workflows/sequence/agent.py

@@ -0,0 +1,35 @@
+# 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.
+
+"""Sample workflow for simple sequential workflow with LLM agents."""
+
+from google.adk import Agent
+from google.adk import Workflow
+
+generate_fruit_agent = Agent(
+    name="generate_fruit_agent",
+    instruction="""Return the name of a random fruit.
+      Return only the name, nothing else.""",
+)
+
+generate_benefit_agent = Agent(
+    name="generate_benefit_agent",
+    instruction="""Tell me a health benefit about the specified fruit.""",
+)
+
+
+root_agent = Workflow(
+    name="root_agent",
+    edges=[("START", generate_fruit_agent, generate_benefit_agent)],
+)