Timeline View - TraceRoot

The trace viewer has three views: Trace (hierarchical tree), Timeline (Gantt-style bars), and Detectors (findings produced for the trace). The Trace and Timeline views share selection and collapse state.

TraceRoot trace viewer showing the Timeline view with span bars

Trace, Timeline, and Detectors

Trace view	Timeline view	Detectors view
Call hierarchy and parent/child relationships	Span duration relative to siblings	Findings produced by detectors
Inspecting span attributes, inputs, outputs	Finding the critical path or longest span	Reviewing detector results for this trace
Navigating nested agent or tool calls	Checking parallel vs serial execution	Opening the related analysis

The Detectors view is hidden for detector and agent traces, which detectors do not evaluate, and when the trace viewer is embedded in an evaluation view.

Toggling

Use the Trace, Timeline, and Detectors buttons in the trace viewer’s sub-header. Selection persists when switching between Trace and Timeline.

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.