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Session Trace view replaces Transcript and Timeline

Changelog

FeatureMajorPlatformCloudCLIUI, API, CLI

On main, not yet released

Session Trace tab with two turns, the step waterfall and the inspector open on a write_file call

In the UI: a session now opens on Trace, which replaces the Transcript and Timeline tabs. A turn rail with a minimap leads to each turn’s steps: model calls, tool calls, approvals, sub-agents and messages, with waterfall timing bars. The step inspector shows input, output, the full model request and raw events. Batches and sub-agents expand inline, search jumps to a hit, and j and k move between steps. The view, error filter and selected step live in the URL.

In code: read the same data from /v1/sessions/{id}/trace, or with everruns sessions trace get and everruns sessions trace turns list.

See Web UI, the sessions CLI reference and #4481, #4500, #4503, #4556.