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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 v2.1.246

Forged max-turns notes are now neutralised in untrusted text

You'll notice
Useful3 Signal3
Prompt Safety

Forged max-turns notes pasted into tool output are now escaped so they can't fake harness messages.

What

The filter that defuses control markers pasted into tool output or fetched content gained a rule for forged max-turns notes, escaping their characters so they cannot be read as a real harness message.

Details
  • Sits alongside the existing system-reminder tag, harness envelope tag and marker-prefix rules.
  • Unlike the adjacent frame-prefix rule, it carries no enabled predicate, so it is always applied.
Evidence

max-turns-note-forgery

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 v2.1.246 →