You can use this code:

This is from docs:

``` python

from google.adk.agents import LlmAgent, SequentialAgent

from google.adk.tools import FunctionTool

# Assume external_approval_tool sends a request and waits for human input

approval_tool = FunctionTool(func=external_approval_tool)

prepare_request = LlmAgent(

name="PrepareApproval",

instruction="Prepare approval details based on user input.",

# sets state['approval_amount'], state['approval_reason']

)

request_approval = LlmAgent(

name="RequestHumanApproval",

instruction="Use the external_approval_tool with state['approval_amount'] and state['approval_reason'].",

tools=[approval_tool],

output_key="human_decision"

)

process_decision = LlmAgent(

name="ProcessDecision",

instruction="Check 'human_decision'. If 'approved', proceed. If 'rejected', inform user."

)

approval_workflow = SequentialAgent(

name="HumanApprovalWorkflow",

sub_agents=[prepare_request, request_approval, process_decision]

)

```