Group of 3 Nothing to try yet
Artifact hot-update/live-doc syncing now has its own feature flag and new deadline, seq, and unchanged fields
What
- The artifact hot-update (live-reload) check now uses its own
CLAUDE_CODE_ARTIFACT_HOTenvironment variable andtengu_copper_hinge_wrengate, instead of incorrectly sharing theCLAUDE_CODE_ARTIFACT_TYPESvariable andtengu_cobalt_plinth_larchgate used by the separate artifact-types feature. - Artifact publish requests can now pass a
deadlinefield, which is forwarded to the create/update/live-doc publish calls; the publish response can echo backdeadlineplus adeadlineDroppedflag, along with newseqandunchangedfields. - The artifact/live-doc read response schema gains
seqandunchangedfields, and (only when a feature gate is on)deadline/deadlineDroppedfields, supporting a long-poll style read.
Why
Separating the hot-update flag from the unrelated artifact-types flag means each can be turned on or off independently without accidental interference. The new deadline/seq/unchanged fields lay the groundwork for telling older open copies of a published artifact when to stop and for tracking whether a read actually changed.
Names in the bundledeadline
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 Environment variables touched a line naming deadline after this was published.
| `CLAUDE_CODE_WEBFETCH_DEADLINE_MS` | Upper bound in milliseconds on how long [WebFetch](/docs/en/tools-reference#webfetch-tool-behavior) waits for a page to download, including any redirects it follows. A download that hasn't completed b…env-vars see the edit
Confirmed since
Anthropic's documentation has since written up deadline, on Claude Code changelog.
* Fixed WebFetch hanging indefinitely on a server that keeps the response open without finishing; a fetch now fails after 300 seconds. Set `CLAUDE_CODE_WEBFETCH_DEADLINE_MS` to override the deadline (0 turns it off)changelog see the edit
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not say what the deadline value controls in practice or when `deadlineDropped` would be set.
Anthropic's documentation agrees
Anthropic's documentation has since written up deadline, on Claude Code changelog.