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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

Reference / Feature flags

tengu_umber_lattice

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.224, including the newest one read.

What it is

Published artifacts can gain a document database Claude reads and writes, off unless you set the env var.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.224.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.224 – 2.1.243 19 releases in the build — bool:false

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Gate readings

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.228 read on another version Off in both readings off off on
v2.1.224 read on another version Off in both readings off off on

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Changelog entries naming it

  1. v2.1.228Artifact database reports a rejected session credential

    A rejected artifact credential now reports a distinct "report this" outcome rather than a permission answer.

    gate cited by this entry

  2. v2.1.224Artifact tool gains a document database, off by default

    Published artifacts can gain a document database Claude reads and writes, off unless you set the env var.

    gate cited by this entry

  3. v2.1.224Permission prompts for artifact database access

    Artifact database access asks permission first, with reads and writes scoped differently.

    gate cited by this entry

  4. v2.1.224Artifact database access must be declared when publishing

    An artifact must declare database capability when published, or database calls fail and ask you to republish.

    gate cited by this entry

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

Names beside it

Every feature flag in the inventory starting tengu_umber, up to twelve of them.

tengu_umber_kestrelNo description from anybody. 2.1.206 tengu_umber_petrelNo description from anybody. 2.1.138 tengu_umber_sluiceThe rule stopping Claude publishing artifacts you didn't ask for can now be removed remotely. never mined

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.