CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.221, including the newest one read.
Set to 0 to stop Claude replying on its own to comments sent to it. Requires Claude Code v2.1.228 or later
Anthropic's own wording. Read off Environment variables, captured 2026-09-28.
In the changelogs
9Releases whose published page names CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT.
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v2.1.246
Watching an artifact can arm comment auto-replies, but the capability is gated off
Watching an artifact can arm automatic replies to its comments, but nothing switches that on here.
found in this entry's text
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v2.1.238
Artifact auto-reply state written into the transcript so it survives resume and fork
Automatic replies to artifact comments would survive resume and fork, but the opt-in is off by default.
named in this entry, found in this entry's text
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v2.1.236
Artifact watches can answer comments posted just before the watch started
A comment sent moments before a watch starts could get a reply, but the flag is off.
found in this entry's text
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v2.1.233
Auto-reply guidance tells Claude to check for an existing answer before posting
Auto-reply guidance now tells Claude to read the thread and resolve rather than duplicate.
named in this entry, found in this entry's text
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v2.1.233
Automatic comment replies stand down if someone else answers first
Claude withholds an automatic artifact comment reply if someone else answered while it was writing.
named in this entry, found in this entry's text
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v2.1.233
Turning off artifact auto-react now survives a restart
Turning off artifact auto-replies now sticks across a background session restart.
found in this entry's text
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v2.1.227
Auto-reply to artifact comments can include earlier analysis notes
Automatic artifact comment replies can carry earlier analysis notes, treated as untrusted observations.
named in this entry, found in this entry's text
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v2.1.221
Artifact comment auto-reply subsystem
Claude can watch artifact comment threads and post replies or edits, off unless you set the env var.
named in this entry, found in this entry's text
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v2.1.221
Auto-replies to artifact comments
Claude could answer artifact comments automatically, but the whole path is inert unless you turn it on.
named in this entry, found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT was v2.1.221, 3 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
1Build by build
76One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.