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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.239 ·

Artifact watching now has an explicit "not available here" state

Claude is now told plainly when artifact watching isn't available, so it stops falsely promising to watch.

You'll notice Improvements
JSON All of v2.1.239
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
ImprovementsKind: in v2.1.239,
ImprovementsSection of the release
What

Guidance for watching a published artifact is rebuilt around three states: durable in remote sessions, live when the live-watch flag is on, and none otherwise. The none state tells Claude plainly that nothing will notify it when the artifact is republished and that it must not claim to be watching, which stops false "I'll keep an eye on it" answers.

Details
  • The live state is selected by tengu_slate_lantern, which falls back to off absent a server value; CLAUDE_CODE_REMOTE selects durable; otherwise none.
  • Durable watching is described as wake-subscriptions held by the artifact service rather than polling by the session.
  • Remote sessions persist a durable-watch record (artifact_durable_watches) holding watch rows, stopped-monitor timestamps and orphaned trigger ids.
Evidence

artifact_durable_watches

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Feature flag
tengu_slate_lantern Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.239: off

Read once, for one account on one subscription tier, against v2.1.239. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns on for tengu_slate_lantern, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns off for tengu_slate_lantern, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns on for tengu_slate_lantern, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_slate_lantern, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

See this entry in the whole of v2.1.239 →

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