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The trace viewer renders every trace as either a Trace view (hierarchical tree) or a Timeline view (Gantt-style bars). Both views share selection and collapse state.
TraceRoot trace viewer showing the Timeline view with span bars

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Trace vs Timeline

Trace viewTimeline view
Call hierarchy and parent/child relationshipsSpan duration relative to siblings
Inspecting span attributes, inputs, outputsFinding the critical path or longest span
Navigating nested agent or tool callsChecking parallel vs serial execution

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Toggling

Use the Trace / Timeline buttons in the trace viewer’s sub-header. Selection persists across the switch.

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Click-to-select

Clicking a bar in the Timeline view selects the span and switches back to the Trace view, scrolling and expanding ancestors so the span is visible.