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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 v2.1.234

Narration runner wired to tool rounds, off by default

Not switched on
Useful3 Signal4
Terminal UI Notable not in their notes

Per-session running commentary hooks into each tool round, off unless you set the narration env var.

Narration is gated on CLAUDE_CODE_ENABLE_NARRATION and a server-supplied interval that falls back to 0.

CLAUDE_CODE_ENABLE_NARRATION
What

A new per-session narration facility hooks into each tool round for non-subagent sessions to produce running commentary. It is off unless CLAUDE_CODE_ENABLE_NARRATION is set, and the interval that paces it comes from a server config value that falls back to 0, meaning no narration when neither is provided.

Details
  • The runner tracks its output sink, whether narration was requested, and the last signature it saw; resetting a session aborts the runner and clears the sink.
  • Narration is additionally suppressed in two detected environments when the environment variable is unset.
Evidence

CLAUDE_CODE_ENABLE_NARRATION

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 v2.1.234 →