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Sweep 29 Sep 2026 · 18:10Z Build v2.1.285 506 read Stable v2.1.280 Latest v2.1.285 Next v2.1.285 Feeds RSS JSON llms.txt llms-full.txt Unofficial

tengu_quirky_teacup

flag in the build JSON

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.275, including the newest one read.

New warning notification when the OpenTelemetry headers helper fails, pointing to /status

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.275.

First seen v2.1.275 17 Sep 2026
Last seen v2.1.285 29 Sep 2026
Builds10 / 128on this box, as of v2.1.285
Written about v2.1.275 first named in a changelog, 17 Sep 2026
v2.1.275in the build not in the build never minedv2.1.285

In the changelogs

1

Releases whose published page names tengu_quirky_teacup.

  1. v2.1.275
    New telemetry gate for OpenTelemetry header-helper failures

    New warning notification when the OpenTelemetry headers helper fails, pointing to /status

    gate cited by this entry

Gate readings

1
ReleaseResolvedThis accountAnonymousCompiled default
v2.1.275 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.

First cited

0

No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.

Presence across releases

1
BuildsHow manyDatesReading
v2.1.275 – v2.1.28510 builds17 Sep 2026 → 29 Sep 2026 ◆in the build

Build by build

10

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

BuildDateStateThe record behind it
v2.1.27517 Sep 2026·addedverdict: added · default bool:true
v2.1.27618 Sep 2026·presentverdict: present · default bool:true
v2.1.27718 Sep 2026·presentverdict: present · default bool:true
v2.1.27819 Sep 2026·presentverdict: present · default bool:true
v2.1.28022 Sep 2026·presentverdict: present · default bool:true
v2.1.28123 Sep 2026·presentverdict: present · default bool:true
v2.1.28224 Sep 2026·presentverdict: present · default bool:true
v2.1.28325 Sep 2026·presentverdict: present · default bool:true
v2.1.28428 Sep 2026·presentverdict: present · default bool:true
v2.1.28529 Sep 2026·presentverdict: present · default bool:true

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.

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