CLAUDE_CODE_EVAL_ARTIFACT_STUB_DIR
A Claude Code environment variable, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Point artifact publishing at a local directory and it writes files there instead of calling the service.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.234.
In the changelogs
3Releases whose published page names CLAUDE_CODE_EVAL_ARTIFACT_STUB_DIR.
-
v2.1.251
A confined evaluation mode, set by Claude Code on itself
A confined evaluation mode exists that Claude Code only sets on its own eval subprocesses.
found in this entry's text
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v2.1.234
Eval runs can publish artifacts to a local directory instead of the service
Point artifact publishing at a local directory and it writes files there instead of calling the service.
named in this entry, found in this entry's text
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v2.1.234
Artifact stub mode hides the
/artifactsbrowserIn artifact stub mode the /artifacts browser hides itself, since there is no gallery to browse.
named in this entry, found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_EVAL_ARTIFACT_STUB_DIR was v2.1.234, 17 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
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
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.