Source Intelligence

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 v2.1.240 Home All releases olderv2.1.239 v2.1.241newer
Claude Code v2.1.240

Narration thinking is kept out of the live thinking preview

Not switched on
Useful2 Signal3
Thinking Display

Narration thinking would be hidden from the live thinking preview, but that path is switched off.

The streaming preview skips narration blocks only with the sable-thrush gate on, which defaults off.

What

The streaming path used to always show the first thinking block of a reply as the in-progress thinking preview. It now checks whether that block is narration first and shows nothing if so. Only reachable with the sable-thrush gate on, which is off by default.

Details
  • The call site also checks that the narration helper is present before using it, so builds without it behave as before.
Evidence

isNarrationSummaryBlock

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 v2.1.240 →