The runner command accepts --client-label <name>, listed in its help output.
What's wrong with this entry?
The runner's argument parser takes --client-label <name>, trimming the value and ignoring it if it looks like another flag. It is listed in that command's help output and defaults to the hostname.
claude ... --client-label build-box-2--client-label
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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v2.1.229
Runner refuses unsafe client platform labels
Both mention client self hosted runner
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v2.1.234
Self-hosted runners report when warm-up finished
Both mention self hosted runner
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v2.1.236
Self-hosted runner releases a session only after its work finishes
Both mention self hosted runner