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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 v2.1.238

Artifact auto-reply state written into the transcript so it survives resume and fork

Not switched on
Useful2 Signal4
Artifacts Notable not in their notes

Automatic replies to artifact comments would survive resume and fork, but the opt-in is off by default.

Two transcript record types carry auto-reply intent across resume and clear, reachable only via CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT or a flag that falls back to off.

Feature flag
tengu_sorrel_trellis On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.238: on

Read once, for one account on one subscription tier, against v2.1.238. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT
What

Two new record types are appended to the session transcript so that automatic replies to artifact comments carry across resume, fork and clear, and so a session can hand its intent to a successor. Reachable only where the artifact comment auto-reply opt-in is on: CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT, or the tengu_sorrel_trellis flag, whose compiled fallback is false.

Details
  • artifact-autoreact-ledger holds per-artifact thread state, seen and sent state, turn timestamps and an interrupted flag, scoped to the account uuid, with a roughly 160 KB budget and progressive shedding, debounced writes and a re-stamp on exit.
  • artifact-comment-monitor holds armed or stopped intent per artifact, with parked lines belonging to other sessions and a torn-tail variant that downgrades armed rows to stopped.
  • A ledger written under a different account is downgraded on load, reported as ledger_foreign_account; write failures report ledger_write_failed.
Evidence

artifact-autoreact-ledger, type: "artifact-autoreact-ledger"

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 v2.1.238 →