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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.292 ·

Artifact tool can read past versions and look in the artifact viewer

The artifact tool gains reads of earlier artifact versions, new page_versions and emulatorPreview kinds, and a new CLAUDE_CODE_ARTIFACT_VERSIONS variable

Group of 5 You'll notice Notable No documentation found Internal Changes
JSON All of v2.1.292
You'll noticeTier: how much it should matter to you
4Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
Internal ChangesKind: in v2.1.292,
What probably matters to youSection of the release

Unclear What the variable does, and whether these lists pass it through or strip it out, is not clear.

What

Artifacts are pages or files Claude builds and shows in an artifact viewer. The tool Claude uses to work with them gains two new abilities.

  • Past-version reads: the artifact read function takes a new pastVer argument, which is passed to the boot read and adds &ver= to the frame request. When it is set, the local-replica fast path (a shortcut that reads a local copy) is skipped. Before, there was no version parameter and the replica was used whenever the artifact was a cowritten type and no file was read.
  • New errors for version reads: an HTTP 400 maps to boot_unknown_ver, with a message saying the server refused that version id and that listing the artifact's versions shows which ones are kept. A response for a different version than the one asked for maps to boot_past_ver_ignored.
  • A new _e path reads frame content through a content-fetch helper when the artifact data qualifies for it.
  • page_versions: a new artifact kind with its own result handler.
  • emulatorPreview: a new artifact kind. Its results read "Looked at … in the artifact viewer", "Stopped looking at …" or "Could not look at …". When a mode check returns emulator, the tool prompt and preview wording say "a look in the artifact viewer" instead of "local preview", and a different prompt paragraph is used. Before, only "local preview" and "Previewed" wording existed.
  • CLAUDE_CODE_ARTIFACT_VERSIONS: a new environment variable (a setting passed in from outside the program), absent from the previous build. It is added to three lists of variable names next to CLAUDE_CODE_ARTIFACT_SHARE; these lists appear to cover variables forwarded to child or host processes. Nothing that reads it was traced, so its effect is unknown, though it may switch version reads on.

Why

Claude may be able to look at earlier versions of an artifact rather than only the current one, and to view artifacts in the artifact viewer itself. Because the controlling variable's reader was not found, these pieces may not be active yet.

Read from
Names in the bundleCLAUDE_CODE_ARTIFACT_VERSIONS
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat the variable does, and whether these lists pass it through or strip it out, is not clear.
The name it cites is new in this buildNew in this build: CLAUDE_CODE_ARTIFACT_VERSIONS

See this entry in the whole of v2.1.292 →

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