Python: [Bug]: Code sample for Sequential Workflow does not work

[buzahid]

Description

The sample code at python/samples/03-workflows/orchestrations/sequential_agents.py results in the error TypeError: 'AgentResponseUpdate' object is not iterable.

What is the correct code for displaying all sequential workflow messages?

Using Agent Framework Version: 1.5.0

Error Messages / Stack Traces

TypeError: 'AgentResponseUpdate' object is not iterable

Package Versions

agent-framework 1.5.0

Python Version

Python 3.12.10

Additional Context

No response

[github-actions]

🤖 Automated triage reproduction notes (agent-authored — trust but verify)

Agent analysis

The bug is in the sample code at python/samples/03-workflows/orchestrations/sequential_agents.py lines 62-71. When stream=True, workflow output events carry AgentResponseUpdate objects (not list[Message]), so casting event.data to list[Message] (line 65) and then iterating with enumerate(outputs[-1]) (line 69) raises TypeError. Minimal repro: build a SequentialBuilder workflow with two agents, run with stream=True, collect output event.data, and attempt to iterate — see test_sequential_sample_bug_5975.py.

• Failing test: python/packages/orchestrations/tests/test_sequential_sample_bug_5975.py
• Files examined: python/samples/03-workflows/orchestrations/sequential_agents.py, python/packages/orchestrations/agent_framework_orchestrations/_sequential.py, python/packages/core/agent_framework/_types.py, python/packages/core/agent_framework/_workflows/_agent_executor.py, python/packages/orchestrations/tests/test_sequential.py
• Tests run: python/packages/orchestrations/tests/test_sequential_sample_bug_5975.py::test_sample_code_pattern_stream_true_issue_5975, python/packages/orchestrations/tests/test_sequential_sample_bug_5975.py::test_streaming_output_is_agent_response_update_not_list_message
• Reported version: 1.5.0
• Current version: 1.5.0