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Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.288 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial

tengu_twinkling_boole

flag in the build JSON

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.280, including the newest one read.

Claude now warns when dispatching multiple write-capable agents into the same working directory

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.280.

First seen v2.1.280 22 Sep 2026
Last seen v2.1.288 2 Oct 2026
Builds9 / 131on this box, as of v2.1.288
Written about v2.1.280 first named in a changelog, 22 Sep 2026
v2.1.280in the build not in the build never minedv2.1.288

In the changelogs

1

Releases whose published page names tengu_twinkling_boole.

  1. v2.1.280
    Warning added when dispatching parallel write-capable agents into the same directory

    Claude now warns when dispatching multiple write-capable agents into the same working directory

    gate cited by this entry

Gate readings

1
ReleaseResolvedThis accountAnonymousCompiled default
v2.1.280 read on another version Not enough to say no value returned no value returned off

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
v2.1.280 – v2.1.2889 builds22 Sep 2026 → 2 Oct 2026 ◆in the build

Build by build

9

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
v2.1.28022 Sep 2026·addedverdict: added · default bool:false
v2.1.28123 Sep 2026·presentverdict: present · default bool:false
v2.1.28224 Sep 2026·presentverdict: present · default bool:false
v2.1.28325 Sep 2026·presentverdict: present · default bool:false
v2.1.28428 Sep 2026·presentverdict: present · default bool:false
v2.1.28529 Sep 2026·presentverdict: present · default bool:false
v2.1.28630 Sep 2026·presentverdict: present · default bool:false
v2.1.2871 Oct 2026·presentverdict: present · default bool:false
v2.1.2882 Oct 2026·presentverdict: present · default bool:false

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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