fix: use agent structured output in workflows#22172
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Summary
AgentWorkflowfall back to the active agent'sstructured_output_fn/output_clswhen the workflow itself does not define structured output handling.structured_output_fn/output_clsprecedence when those are configured.Root cause
AgentWorkflowfinalization calledagent.finalize(...)but then only consultedself.structured_output_fnandself.output_cls. As a result, structured output configured on aFunctionAgentworked withagent.run(...)but was ignored when the same agent ran inside anAgentWorkflow.Test plan
test_agentworkflow_uses_agent_structured_output_fnfailed because noAgentStreamStructuredOutputevent was emitted.uv run --frozen --project llama-index-core pytest llama-index-core/tests/agent/workflow/test_agent_with_structured_output.py::test_agentworkflow_uses_agent_structured_output_fn -quv run --frozen --project llama-index-core pytest llama-index-core/tests/agent/workflow/test_agent_with_structured_output.py -quv run --frozen --project llama-index-core pytest llama-index-core/tests/agent/workflow/test_multi_agent_workflow.py -quv run --frozen --project llama-index-core ruff format --check llama-index-core/llama_index/core/agent/workflow/multi_agent_workflow.py llama-index-core/tests/agent/workflow/test_agent_with_structured_output.pyuv run --frozen --project llama-index-core ruff check llama-index-core/llama_index/core/agent/workflow/multi_agent_workflow.py llama-index-core/tests/agent/workflow/test_agent_with_structured_output.py