client_platform
A Claude Code settings key, read out of the shipped bundle. It has been in the build since v2.1.309, including the newest one read.
Set OTEL_METRICS_EXPORTER=prometheus and child sessions report through the runner, giving one scrape target per machine.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.224.
In the changelogs
3Releases whose published page names client_platform.
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v2.1.229
Runner refuses unsafe client platform labels
Odd platform labels from the runner are rejected or replaced with "unknown" instead of exported.
found in this entry's text
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v2.1.229
Self-hosted runner requires
--base-diron WindowsSelf-hosted runners on Windows now require you to set a base directory instead of failing oddly.
found in this entry's text
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v2.1.224
Runner collects metrics from its child sessions and re-exports them
Set OTEL_METRICS_EXPORTER=prometheus and child sessions report through the runner, giving one scrape target per machine.
found in this entry's text
First cited
1The earliest release whose published evidence quoted client_platform was v2.1.229, 12 Aug 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
1Build by build
1One 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.