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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.

← All of v2.1.223 Home All releases ←olderv2.1.222 v2.1.224newer→
Claude Code v2.1.223

Version bump to 2.1.223

You'll notice
Useful2 Signal0
Internals not in their notes

You're on build 2.1.223, with mostly cosmetic internal tidying alongside it.

/whiteboard/prototype
What

The embedded build constants moved to 2.1.223 with a new build time and git sha.

Details
  • roughly 80 changes in this group are the version constant being re-inlined at each use site
  • also cosmetic: the /whiteboard and /prototype command names moved to shared constants
  • an attachment schema moved into its own module
  • several React-compiler memo caches were renumbered
Evidence

BUILD_TIME: "2026-08-05T18:12:31Z"

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 v2.1.223 →