chore: import upstream snapshot with attribution

contributing/samples/patterns/workflow_triage/agent.py

@@ -0,0 +1,56 @@
+# 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 google.adk.agents.llm_agent import Agent
+from google.adk.tools.tool_context import ToolContext
+
+from . import execution_agent
+
+
+def update_execution_plan(
+    execution_agents: list[str], tool_context: ToolContext
+) -> str:
+  """Updates the execution plan for the agents to run."""
+
+  tool_context.state["execution_agents"] = execution_agents
+  return "execution_agents updated."
+
+
+root_agent = Agent(
+    name="execution_manager_agent",
+    instruction="""\
+You are the Execution Manager Agent, responsible for setting up execution plan and delegate to plan_execution_agent for the actual plan execution.
+
+You ONLY have the following worker agents: `code_agent`, `math_agent`.
+
+You should do the following:
+
+1. Analyze the user input and decide any worker agents that are relevant;
+2. If none of the worker agents are relevant, you should explain to user that no relevant agents are available and ask for something else;
+3. Update the execution plan with the relevant worker agents using `update_execution_plan` tool.
+4. Transfer control to the plan_execution_agent for the actual plan execution.
+
+When calling the `update_execution_plan` tool, you should pass the list of worker agents that are relevant to user's input.
+
+NOTE:
+
+* If you are not clear about user's intent, you should ask for clarification first;
+* Only after you're clear about user's intent, you can proceed to step #3.
+""",
+    sub_agents=[
+        execution_agent.plan_execution_agent,
+    ],
+    tools=[update_execution_plan],
+)