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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

Reference / Environment variables

CLAUDE_CODE_ARTIFACT_COMMENTS

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.

What it is

Set to 0 to stop Claude reading and replying to [comments on an artifact](/docs/en/artifacts#collect-comments-on-an-artifact). Has no effect when CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC has [turned artifacts off](/docs/en/artifacts#availability). Requires Claude Code v2.1.221 or later

Anthropic's own wording. Read off Environment variables, captured 2026-08-28.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.221 – 2.1.243 22 releases in the build triBool —

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Changelog entries naming it

  1. v2.1.248Artifact comment threads are summarised before Claude acts on them

    Artifact comment threads get summarised so the permission prompt names what's being acted on.

    named in this entry

  2. v2.1.248Permission prompts say whose comment is being acted on

    Comment permission prompts can name whose comment it is, behind an artifact-comments env var.

    named in this entry

  3. v2.1.246Artifact comments refuse organization service keys

    Artifact comments now explain org service key failures clearly, but comments themselves need an env var.

    named in this entry

  4. v2.1.239Artifact request schema: auto_reply gated, embeds compiled out

    Artifact auto-reply appears only with comments enabled, and an embeds field is compiled out entirely.

    named in this entry

  5. v2.1.239Artifact watch entries gain unread-comment counters behind the comments flag

    Artifact watches can track unread comments and replies, but only with the comments flag on.

    named in this entry

  6. v2.1.235Artifact MCP is on by default

    The built-in artifact MCP server is now on for everyone unless you set the env var to disable it.

    named in this entry

  7. v2.1.227Artifact auto-replies stop describing their own plumbing

    Automatic artifact comment replies now sound like plain acknowledgements instead of describing internal plumbing.

    named in this entry

  8. v2.1.227Artifact tool can resolve comment threads, behind an off-by-default flag

    Claude could mark a comment thread on a published artifact as resolved, but the path is off.

    named in this entry

  9. v2.1.221Artifact comment errors distinguish egress-proxy blocks and non-activated threads

    Artifact comment failures would name the real cause, like a proxy block or an unactivated thread, once enabled.

    named in this entry

  10. v2.1.221Artifact live-update arming carries auto-react wiring

    Artifact live-update watching now carries the plumbing needed for automatic comment replies and cancellation.

    named in this entry

  11. v2.1.221Comment replies always ask, and the prompt names who will see them

    Replying to an artifact comment always asks first, and tells you whether the artifact is shared.

    named in this entry

  12. v2.1.221Artifact auto-reply subscriptions can be stopped from the cancel gestures

    Escape or double ctrl+x ctrl+k now also turns off automatic replies to comments on your artifacts.

    named in this entry

  13. v2.1.221New artifact comment threads: read, reply, resolve

    Reading, replying to and resolving comment threads on published artifacts is built in but off unless enabled.

    named in this entry

Documentation pages

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.

Names beside it

Every environment variable in the inventory starting claude_code_artifact, up to twelve of them.

CLAUDE_CODE_ARTIFACTPR review artifact pages can show a pinned button that approves the pull request from your GitHub account. 2.1.166 CLAUDE_CODE_ARTIFACT_ASSET_BASE_URLThree artifact environment variables are now recognised, with the API token stripped from spawned processes as a secret. 2.1.221 CLAUDE_CODE_ARTIFACT_ASSETSClaude can now upload, list, read and delete images, video, PDFs and fonts attached to your published artifacts. 2.1.234 CLAUDE_CODE_ARTIFACT_AUTO_OPENSet to 0 to stop Claude Code from opening the browser automatically when a new [artifact](/docs/en/artifacts) is published. Republishing an existing artifact does not open the browser regardless of this setting 2.1.172 CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACKClaude can post a quick 'on it' note in artifact comment threads before the real reply, off unless enabled. 2.1.232 CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACK_FIXEDA cheaper canned way to acknowledge artifact comments exists but needs two env vars switched on. 2.1.235 CLAUDE_CODE_ARTIFACT_COMMENT_RESPONDERA read-only subagent that analyses one artifact comment thread exists but stays off. 2.1.227 CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACTSet to 0 to stop Claude [replying on its own to comments sent to it](/docs/en/artifacts#let-claude-reply-to-comments-on-its-own). Requires Claude Code v2.1.228 or later 2.1.221 CLAUDE_CODE_ARTIFACT_DBPublished artifacts can gain a document database Claude reads and writes, off unless you set the env var. 2.1.224 CLAUDE_CODE_ARTIFACT_DELETEClaude can now read back a published artifact's contents; browsing, multi-file publishing and deletion are built but off. 2.1.239 CLAUDE_CODE_ARTIFACT_DIRECT_UPLOADArtifact availability now hinges on one gate, and direct upload kicks in for create paths. 2.1.172 CLAUDE_CODE_ARTIFACT_LIVE_BASE_URLThree artifact environment variables are now recognised, with the API token stripped from spawned processes as a secret. 2.1.221

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.