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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 v2.1.221

Assorted validation and parsing tightening

You'll notice
Useful2 Signal0
Tool Use

Assorted small fixes to browser tabs, plugin ids, web search categories and artifact labels.

What

Several small parsing and validation paths were corrected across browser control, plugins, web search, artifacts and token stats.

Details
  • Browser navigate treats an explicitly null tabId as absent: n.tabId !== null && n.tabId !== void 0.
  • Plugin id extraction takes the prefix before the first @ via indexOf instead of a split helper.
  • The web-search category regex widened to <category>([a-z0-9 &_-]{1,64})</category>.
  • Artifact label sanitization also strips CJK and fullwidth brackets.
  • Daily-token stats persist a new dailyModelTokensVersion field.
Evidence

dailyModelTokensVersion

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 v2.1.221 →