feat: Introduce PersistentAgentTool for observable agent-as-tool execution#990
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feat: Introduce PersistentAgentTool for observable agent-as-tool execution#990copybara-service[bot] wants to merge 1 commit intomainfrom
copybara-service[bot] wants to merge 1 commit intomainfrom
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…ution This change introduces `PersistentAgentTool`, a new tool that allows an ADK agent to invoke another agent as a tool while enabling improved observability and state management. Unlike the existing `AgentTool`, which uses an in-memory runner for sub-agent execution, `PersistentAgentTool` is designed to be used with externally provided session and artifact services. This allows all events and state changes from the sub-agent's execution to be logged to the calling agent's session, which is critical when using persistent session storage for debugging and tracing complex, multi-step agent workflows. `PersistentAgentTool` collects all events from the sub-agent's execution, propagates all state changes back to the caller's tool context, and returns the sub-agent's final result along with a full execution trace. This enables robust orchestration patterns where one agent can decompose a task and delegate steps to other agents as tools, while maintaining full visibility into each step. PiperOrigin-RevId: 880895506
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feat: Introduce PersistentAgentTool for observable agent-as-tool execution
This change introduces
PersistentAgentTool, a new tool that allows an ADK agent to invoke another agent as a tool while enabling improved observability and state management.Unlike the existing
AgentTool, which uses an in-memory runner for sub-agent execution,PersistentAgentToolis designed to be used with externally provided session and artifact services. This allows all events and state changes from the sub-agent's execution to be logged to the calling agent's session, which is critical when using persistent session storage for debugging and tracing complex, multi-step agent workflows.PersistentAgentToolcollects all events from the sub-agent's execution, propagates all state changes back to the caller's tool context, and returns the sub-agent's final result along with a full execution trace. This enables robust orchestration patterns where one agent can decompose a task and delegate steps to other agents as tools, while maintaining full visibility into each step.