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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.238

Per-install identifier renamed in config

Under the hood
Useful2 Signal2
Configuration not in their notes

Your install identifier moved to a key called machineID, so a fresh value is generated on next write.

machineID
What

The generated identifier for an installation is now stored under machineID instead of the old key name, so existing installs will generate a fresh value on next write. The helpers that create and save it now receive the config store explicitly rather than reaching for a global.

Evidence

machineID

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.

See this entry in the whole of v2.1.238 →