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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 v2.1.248

New patterns for spotting prompt-shaped text in transcripts

Under the hood
Useful3 Signal3
Prompt Injection

Transcript sanitising gained patterns for spotting injected fake instructions and turn boundaries.

What

The transcript sanitiser gains literals for detecting injected instructions: a pattern matching phrases like "use 10k tokens" or "spend 5m tokens", a set of impersonation prefixes, and a list of speaker-like words used to find fake turn boundaries.

Details
  • The patterns are present in the build; where they are applied is not visible from the strings alone, so whether anything currently runs them is undetermined.
Evidence

\b(?:use|spend)\s+(\d+(?:\.\d+)?)\s(k|m|b)\stokens?\b

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 v2.1.248 →