CLAUDE_CODE_ARTIFACT_PREVIEW_EMULATOR
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.292, including the newest one read.
An emulator engine for artifact previews in remote sessions is built, but an internal switch that starts off keeps local Chrome in use
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.292.
In the changelogs
2Releases whose published page names CLAUDE_CODE_ARTIFACT_PREVIEW_EMULATOR.
-
v2.1.292
Emulator engine for artifact previews is built but cannot be selected yet
An emulator engine for artifact previews in remote sessions is built, but an internal switch that starts off keeps local Chrome in use
found in this entry's text
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v2.1.292
Artifact previews in cloud sessions can run in the real artifact viewer
In cloud sessions, the artifact preview tool can now show a page inside a downloaded copy of the real artifact viewer instead of a local browser
found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_ARTIFACT_PREVIEW_EMULATOR was v2.1.292, 6 Oct 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
4One 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.