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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_gb_eval_authed_enable

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.212 and was gone by v2.1.227.

What it is

Feature-flag requests can now attach auth asynchronously, but that path stays off in this build.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.223.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.227 – 2.1.243 16 releases not in the build — —
2.1.212 – 2.1.226 15 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
v2.1.227 read on another version Not enough to say no value returned no value returned not a boolean we can read
v2.1.223 read on another version Not enough to say no value returned no value returned on
v2.1.212 read on another version Not enough to say no value returned no value returned 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. v2.1.227Feature-flag machinery rebuilt as a class with a real dispose path

    Feature-flag handling now cleans up properly, restoring the original fetch when disposed.

    gate cited by this entry

  2. v2.1.223GrowthBook auth header resolution is now async and gated

    Feature-flag requests can now attach auth asynchronously, but that path stays off in this build.

    gate cited by this entry

  3. v2.1.212GrowthBook Authenticated Feature Flag Fetch [Gradual Rollout]

    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_gb, up to twelve of them.

tengu_gb_refresh_interval_minutesFeature flags now refresh in the background every six hours instead of only at startup. 2.1.221

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.