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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_amber_creek

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.138, including the newest one read.

What it is

Accepting fullscreen now runs as a trial, and two crashed launches disable it on that machine.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.236.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.138 – 2.1.243 95 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
v2.1.239 Not enough to say no value returned no value returned on
v2.1.236 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. v2.1.239Fullscreen rendering turns on by default for fresh installs when remote config is unavailable

    Fresh installs without remote config now start with the flicker-free fullscreen renderer on.

    gate cited by this entry

  2. v2.1.236Fullscreen is offered as a trial, and turns itself off after repeated failed launches

    Accepting fullscreen now runs as a trial, and two crashed launches disable it on that machine.

    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_amber, up to twelve of them.

tengu_amber_anchorNo description from anybody. 2.1.138 tengu_amber_astrolabeNo description from anybody. never mined tengu_amber_flintNo description from anybody. 2.1.138 tengu_amber_heronNo description from anybody. 2.1.186 tengu_amber_kestrelNo description from anybody. 2.1.217 tengu_amber_larkNo description from anybody. 2.1.138 tengu_amber_latticeNo description from anybody. 2.1.144 tengu_amber_lynxNo description from anybody. 2.1.138 tengu_amber_moleskinNo description from anybody. 2.1.179 tengu_amber_packetNo description from anybody. 2.1.198 tengu_amber_prismNo description from anybody. 2.1.138 tengu_amber_quartzNo description from anybody. 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.