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Sweep 25 Sep 2026 · 19:33Z Build v2.1.283 504 read Stable v2.1.274 Latest v2.1.283 Next v2.1.283 Feeds RSS JSON llms.txt llms-full.txt Unofficial

tengu_noble_mountain

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.

Write tool now accepts file_text, file_content, and path as aliases for content and file_path, rewriting input before plugin hooks see it

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 v2.1.283 25 Sep 2026
Builds4 / 126on this box, as of v2.1.283
Written about v2.1.280 first named in a changelog, 22 Sep 2026
v2.1.280in the build not in the build never minedv2.1.283

In the changelogs

1

Releases whose published page names tengu_noble_mountain.

  1. v2.1.280
    Write tool now accepts file_text/file_content and path as aliases

    Write tool now accepts file_text, file_content, and path as aliases for content and file_path, rewriting input before plugin hooks see it

    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 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
v2.1.280 – v2.1.2834 builds22 Sep 2026 → 25 Sep 2026 ◆in the build

Build by build

4

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: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

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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