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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 v2.1.237

First-sight summon pickup for artifact comments, off by default

Not switched on
Useful2 Signal4
Artifacts Notable not in their notes

Claude could answer an artifact summon the first time it sees a thread, but the switch is off.

First-sight summon pickup sits behind CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACK or a remote gate that falls back to false.

Feature flag
tengu_gorse_pylon Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.237: on

Read once, for one account on one subscription tier, against v2.1.237. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACK
What

When Claude auto-reacts to comments on an artifact, it can now pick up a recent summon the first time it sees a thread, not only on later sightings. The branch runs when CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACK is set, otherwise it consults the remote gate tengu_gorse_pylon, whose fallback is false. With no server value, the new branch never runs and only the previous pickup path applies.

Details
  • Telemetry reports the outcome: an artifact_comments_autoreact event flags first_sight_summon when summons were found, or gives the rejection reason first_sight_summon_stale when candidates existed but all were too old.
  • Covers both the branch that baselines a newly seen thread and the re-sighted branch.
  • The gate helper itself already existed; only this use of it is new.
Evidence

first_sight_summon_stale

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 v2.1.237 →