What it is
The artifact publish action can offer a pin field, but it is refused outright in cloud sessions and otherwise depends on an env var or gate.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.259.
Presence across releases
1Build by build
19One 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.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
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. v2.1.166
CLAUDE_CODE_ARTIFACT_ASSET_BASE_URLThree artifact environment variables are now recognised, with the API token stripped from spawned processes as a secret. v2.1.221
CLAUDE_CODE_ARTIFACT_ASSETSClaude can now upload, list, read and delete images, video, PDFs and fonts attached to your published artifacts. v2.1.234
CLAUDE_CODE_ARTIFACT_AUTO_OPENSet to 0 to stop Claude Code from opening the browser automatically when a new [artifact](/docs/en/artifacts#create-an-artifact) is published v2.1.172
CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACKClaude can post a quick 'on it' note in artifact comment threads before the real reply, off unless enabled. v2.1.232
CLAUDE_CODE_ARTIFACT_COMMENT_FAST_ACK_FIXEDA second fast-ack mode lets Claude pick a fixed numbered acknowledgment instead of writing one, off behind two gates v2.1.235
CLAUDE_CODE_ARTIFACT_COMMENT_RESPONDERA read-only subagent that analyses one artifact comment thread exists but stays off. v2.1.227
CLAUDE_CODE_ARTIFACT_COMMENTSSet 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 v2.1.221
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 v2.1.221
CLAUDE_CODE_ARTIFACT_DBPublished artifacts can gain a document database Claude reads and writes, off unless you set the env var. v2.1.224
CLAUDE_CODE_ARTIFACT_DB_STR_REPLACEArtifact edits can now require a version match before writing, gated off by default v2.1.265
CLAUDE_CODE_ARTIFACT_DELETEClaude can now read back a published artifact's contents; browsing, multi-file publishing and deletion are built but off. v2.1.239
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.