Files
Shangjie Chen 00760f8455 feat: Support HITL resumption for standalone nodes and NodeTool
- Enable resumability and add Human-in-the-Loop (HITL) step to `node_as_tool` sample workflow.
- Update `node_as_tool` README to document the HITL multi-turn flow.
- Fix `agent_test_runner.py` to preserve the `branch` field when replaying user events in tests.
- Implement lazy rehydration of `resume_inputs` from `session.events` in `NodeRunner` for standalone nodes (e.g. nodes run as tools of an Agent). This allows standalone nodes to resume correctly.

Co-authored-by: Shangjie Chen <deanchen@google.com>
PiperOrigin-RevId: 948503030
2026-07-15 13:07:08 -07:00

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{
"appName": "node_as_tool",
"id": "12345678-1234-1234-1234-123456789abc",
"userId": "user",
"events": [
{
"content": {
"parts": [
{
"functionCall": {
"id": "fc-3",
"args": {
"interruptId": "fc-3",
"payload": null,
"message": "Apply VIP discount for tier 'Verified VIP Member'?",
"response_schema": null
},
"name": "adk_request_input"
}
}
]
},
"author": "calculate_discount",
"nodeInfo": {
"path": "calculate_discount@1"
},
"longRunningToolIds": [
"fc-3"
],
"branch": "calculate_discount@fc-2"
},
{
"content": {
"parts": [
{
"text": "Checking discount rules for tier 'Verified VIP Member'..."
}
],
"role": "user"
},
"author": "calculate_discount",
"nodeInfo": {
"path": "calculate_discount@1"
},
"branch": "calculate_discount@fc-2"
},
{
"content": {
"parts": [
{
"text": "Checking discount rules for tier 'Verified VIP Member'..."
}
],
"role": "user"
},
"author": "calculate_discount",
"nodeInfo": {
"path": "calculate_discount@1"
},
"branch": "calculate_discount@fc-2"
},
{
"author": "calculate_discount",
"output": "20% off",
"nodeInfo": {
"path": "calculate_discount@1",
"outputFor": [
"calculate_discount@1"
]
},
"branch": "calculate_discount@fc-2"
},
{
"author": "customer_lookup_workflow",
"output": {
"user_id": "c123",
"tier": "Verified VIP Member"
},
"nodeInfo": {
"path": "customer_lookup_workflow@1/lookup_customer_data@1",
"outputFor": [
"customer_lookup_workflow@1/lookup_customer_data@1",
"customer_lookup_workflow@1"
]
},
"branch": "customer_lookup_workflow@fc-1"
},
{
"content": {
"parts": [
{
"functionCall": {
"id": "fc-2",
"args": {
"tier": "Verified VIP Member"
},
"name": "calculate_discount"
}
}
],
"role": "model"
},
"author": "customer_service_agent",
"nodeInfo": {
"path": "customer_service_agent@1"
},
"longRunningToolIds": [
"fc-2"
]
},
{
"content": {
"parts": [
{
"functionCall": {
"id": "fc-1",
"args": {
"user_id": "c123"
},
"name": "customer_lookup_workflow"
}
}
],
"role": "model"
},
"author": "customer_service_agent",
"nodeInfo": {
"path": "customer_service_agent@1"
},
"longRunningToolIds": [
"fc-1"
]
},
{
"content": {
"parts": [
{
"functionResponse": {
"id": "fc-1",
"name": "customer_lookup_workflow",
"response": {
"user_id": "c123",
"tier": "Verified VIP Member"
}
}
}
],
"role": "user"
},
"author": "customer_service_agent",
"nodeInfo": {
"path": "customer_service_agent@1"
}
},
{
"content": {
"parts": [
{
"functionResponse": {
"id": "fc-2",
"name": "calculate_discount",
"response": {
"result": "20% off"
}
}
}
],
"role": "user"
},
"author": "customer_service_agent",
"nodeInfo": {
"path": "customer_service_agent@1"
}
},
{
"content": {
"parts": [
{
"text": "Customer c123 is a Verified VIP Member and gets a 20% discount."
}
],
"role": "model"
},
"author": "customer_service_agent",
"nodeInfo": {
"path": "customer_service_agent@1"
}
},
{
"content": {
"parts": [
{
"functionResponse": {
"id": "fc-3",
"name": "adk_request_input",
"response": {
"text": "yes"
}
}
}
],
"role": "user"
},
"author": "user",
"nodeInfo": {
"path": ""
},
"branch": "calculate_discount@fc-2"
}
]
}