chore: import upstream snapshot with attribution

2026-07-13 13:25:13 +08:00
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+# Three Layer Transfer Sample
+
+## Overview
+
+This sample demonstrates a three-layer multi-agent system built with the ADK Python toolkit, showcasing structured double-round-trip hierarchical transfers.
+
+## Sample Inputs
+
+- `Hello, who are you?`
+- `Can you write a short story about a lost kitten?`
+- `Please translate it into Spanish.`
+- `Looks great! Let's return to the project coordinator.`
+
+## Graph
+
+```mermaid
+graph TD
+    root_agent[root_agent] --> writer_agent[writer_agent]
+    writer_agent --> translator_agent[translator_agent]
+```
+
+## How To
+
+This sample demonstrates:
+
+1. Root delegating to middle-child node `writer_agent`.
+1. `writer_agent` delegating to leaf-grandchild node `translator_agent`.
+1. Grandchild returning back to the parent `writer_agent`.
+1. Parent returning back to the root coordinator `root_agent`.