durationMs
A Claude Code settings key, read out of the shipped bundle. It was in the build from v2.1.309 and was gone by v2.1.321.
API requests now carry a per-attempt request ID and log more detail about retries
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.268.
In the changelogs
4Releases whose published page names durationMs.
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v2.1.280
SDK tool-result streaming can attach agentId/durationMs for Task-like tools
Streamed tool results for the Task tool can now include an agent ID and duration
named in this entry, found in this entry's text
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v2.1.280
Task delegation now carries usage stats forward
Sub-task handoff now carries forward token, tool-use, and duration stats
found in this entry's text
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v2.1.268
API dispatch requests now carry a per-attempt client request ID and richer retry telemetry
API requests now carry a per-attempt request ID and log more detail about retries
found in this entry's text
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v2.1.205
/doctorredesigned as a comprehensive 8-check repair skillfound in this entry's text
First cited
4The earliest release whose published evidence quoted durationMs was v2.1.273, 15 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
6Build by build
12One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.