Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
HooksArea: what it touches
Internal ChangesKind: in v2.1.273,
Internal ChangesSection of the release
What
After a tool call completes (including after PostToolUse hooks run), the resulting message now carries a toolDuration field with the tool's name and how long it took, in milliseconds. These per-call durations feed into a toolDurations array that gets aggregated elsewhere, such as in request payloads and session statistics.
Why
This gives visibility into how long individual tool calls take, supporting reporting and aggregation of tool performance across a session.
