What
When Claude Code's artifact database rejects an edit, it now passes through several specific error reasons instead of collapsing them into a generic failure: edit_no_match, edit_ambiguous, edit_field_missing, edit_field_not_string, and version_mismatch.
Why
This makes it clearer why an edit to an artifact failed, for example because the text to replace couldn't be found, matched more than one place, or the artifact had been changed by someone else in the meantime, rather than just showing an unhelpful generic error.
Names in the bundleedit_no_matchedit_ambiguousversion_mismatch
Documented inclaude-code/agent-sdk/typescript
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.
Confirmed since
Anthropic's documentation has since written up version_mismatch, on Agent SDK reference - TypeScript.
| "protocol_version_mismatch"agent-sdk/typescript 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 version_mismatch, on Agent SDK reference - TypeScript.