Action Confirmation issue using API Server - Human in the loop

[ynaiborlang]

Hi all, I am trying to pass the response to the tool confirmation with adk api_server but I'm gettting this error :

File "D:\projects\python\ai_engine_deploy\.venv\Lib\site-packages\google\adk\runners.py", line 401, in _run_with_trace
    invocation_context.agent.name
AttributeError: 'NoneType' object has no attribute 'name'

So basically if the user wants to book a car but the number of passengers exceeds the maximum passenger capacity of cars in the database, it should contact the admin and inquire if they can make special arrangements for a bigger vehicle

this is my function call event :

{
	"content": {
		"parts": [
			{
				"functionCall": {
					"id": "adk-a4db72b9-1dc3-4d3f-9899-3d6480a4e3db",
					"args": {
						"originalFunctionCall": {
							"id": "adk-a20a9b44-b684-4464-89a2-2fe7a5efe40b",
							"args": {
								"question": "User wants to book a minibus for 30 people to Shillong. Can we make special arrangements for a group this large?"
							},
							"name": "ask_admin"
						},
						"toolConfirmation": {
							"hint": "User wants to book a minibus for 30 people to Shillong. Can we make special arrangements for a group this large?",
							"confirmed": false,
							"payload": {
								"admin_response": ""
							}
						}
					},
					"name": "adk_request_confirmation"
				}
			}
		],
		"role": "user"
	},
	"invocationId": "e-e7fc2193-6a34-4fff-b8b1-c2655ae77479",
	"author": "cab_booking_agent",
	"actions": {
		"stateDelta": {},
		"artifactDelta": {},
		"requestedAuthConfigs": {},
		"requestedToolConfirmations": {}
	},
	"longRunningToolIds": [
		"adk-a4db72b9-1dc3-4d3f-9899-3d6480a4e3db"
	],
	"id": "5066293f-c3a1-4a75-95e2-d263a30c2d60",
	"timestamp": 1764833612.479231
}

and this is my POST request body :

{
    "app_name": "agent",
    "user_id": "user_2",
    "session_id": "session_1",
    "invocation_id": "e-e7fc2193-6a34-4fff-b8b1-c2655ae77479",
    "streaming":false,
    "new_message": {
        "role": "user",
        "parts": [
            {
                "function_response": {
                    "id": "adk-a4db72b9-1dc3-4d3f-9899-3d6480a4e3db",
                    "name": "adk_request_confirmation",
                    "response": {
                       "payload":{
                         "admin_response": "yes we can get minibus"
                       }
                    }
                }
            }
        ]
    }
}

adk version : 1.20.0

Am I missing something? Thanks

[jagmarques]

That AttributeError on invocation_context.agent.name usually means the session lost track of which agent triggered the confirmation. Check if your invocation_id matches the one from the original function call event exactly. The api_server reconstructs the agent from the session state and if the invocation context is stale it returns None instead of the agent object.