- 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
Introduce NodeTool, allowing individual Nodes and entire Workflows to be wrapped and executed as standard ADK Tools.
This PR implements the core, single-turn execution capability:
- Support auto-wrapping of BaseNode (Workflows) directly in Agent.tools.
- Wrapping synchronous and asynchronous function nodes as NodeTools.
- Providing a complete sample workflow demonstrating how to run a workflow as a tool.
Resumption and multi-turn nested HITL support are skipped in this PR and will be fully enabled in the later PR.
Co-authored-by: Shangjie Chen <deanchen@google.com>
PiperOrigin-RevId: 943499058
Shangjie Chen