What
- Sources for the artifact publish tool's
filesparameter (and therootit's relative to) can now live in the session's scratchpad directory, not only the current working directory — the tool's parameter descriptions were updated to say so explicitly. - The underlying trust check for the
rootparameter was reworked: instead of a manual string-prefix comparison against the working directory, it now calls a new helper pair to validate the path, and file-processing calls (both the general file-copy path and thumbnail generation) pass an extra options object from a new helper function.
Why
This lets Claude publish artifacts built from files it created in its scratchpad, not just files in the project's working directory, while keeping the same path-trust safety checks, now reworked to also cover the scratchpad case.
Names in the bundlescratchpad
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Added since
A small documentation edit on Hooks reference touched a line naming scratchpad after this was published.
| `scratchpad_dir` | Path to the session's [scratchpad directory](/docs/en/claude-directory#session-scratchpad-directory), where Claude keeps temporary working files. Absent when the session has no scratchpad or the temp directory is unava…hooks see the edit
Confirmed since
Anthropic's documentation has since written up scratchpad, on Claude Code changelog.
* Fixed Artifact updates failing with "File not found" after a session resumes on another machine or its scratchpad is cleared: the page's last published version is restoredchangelog see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up scratchpad, on Claude Code changelog.