What probably matters to youSection of the release
What
Setting CLAUDE_CODE_EVAL_ARTIFACT_STUB_DIR makes artifact publishing write to that directory rather than contacting the artifact service, producing an index.html, a files/ folder for supporting files and a manifest.json, and returning a synthetic URL with version "1".
Details
Supporting file paths that escape the target directory, including via symlink, are skipped with a warning.
In this path, payloads named *.workshop.html are run through the structural verifier and refused, listing up to 12 violations.
The plugin-eval harness sets the variable for the sessions it spawns.
Evidence
CLAUDE_CODE_EVAL_ARTIFACT_STUB_DIR
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
