Python: [Bug]: DevUI graph ignores HandoffBuilder .add_handoff() routing rules — shows all-to-all arrows

Bug: DevUI graph visualization ignores .add_handoff() routing rules

When using HandoffBuilder with explicit .add_handoff() routing rules, the DevUI graph visualization shows arrows between all participants (fully connected) instead of only the configured handoff routes.

Repro

from agent_framework.orchestrations import HandoffBuilder

workflow = (
    HandoffBuilder(
        name="customer_support_handoff",
        participants=[triage_agent, order_agent, return_agent, refund_agent],
        termination_condition=lambda conversation: (
            len(conversation) > 0 and "goodbye" in conversation[-1].text.lower()
        ),
    )
    .with_start_agent(triage_agent)
    # Triage cannot route directly to refund_agent
    .add_handoff(triage_agent, [order_agent, return_agent])
    # Only return_agent can escalate to refund_agent
    .add_handoff(return_agent, [refund_agent, triage_agent])
    # All specialists can hand back to triage
    .add_handoff(order_agent, [triage_agent])
    .add_handoff(refund_agent, [triage_agent])
    .with_autonomous_mode()
    .build()
)

serve(entities=[workflow], port=8098, auto_open=True)

Expected

The graph should show only the 6 configured edges:

• triage_agent → order_agent
• triage_agent → return_agent
• return_agent → refund_agent
• return_agent → triage_agent
• order_agent → triage_agent
• refund_agent → triage_agent

Notably, there should be no arrow from triage_agent → refund_agent (the whole point of the routing rules).

Actual

DevUI draws arrows between all 4 agents in both directions (fully connected graph), ignoring the .add_handoff() constraints entirely.

Environment

• Python Agent Framework 1.0.0rc1
• OpenAIChatClient with GitHub Models
• macOS / Linux