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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
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tengu_sleepy_shore

flag in the build JSON

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.282, including the newest one read.

The web search tool has a built-in choice between a quick, cheap search and a slower, thorough one, but it stays off unless configured

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.282.

First seen v2.1.282 24 Sep 2026
Last seen v2.1.283 25 Sep 2026
Builds2 / 126on this box, as of v2.1.283
Written about v2.1.282 first named in a changelog, 24 Sep 2026
v2.1.282in the build not in the build never minedv2.1.283

In the changelogs

4

Releases whose published page names tengu_sleepy_shore.

  1. v2.1.283
    Setting the web-search proxy variable no longer turns off fast web search

    CLAUDE_CODE_WEBSEARCH_USE_CCR_PROXY no longer forces fast web search off, and CLAUDE_CODE_WEBSEARCH_CCR_PROXY_FAST is gone

    gate cited by this entry

  2. v2.1.282
    Web search can offer a quick "standard" mode and a thorough "extended" mode, off by default

    The web search tool has a built-in choice between a quick, cheap search and a slower, thorough one, but it stays off unless configured

    gate cited by this entry

  3. v2.1.282
    Fast web search can add an extra hint to Claude's instructions

    When fast web search is on and a web search tool is available, Claude's system prompt gets an extra hint

    gate cited by this entry

  4. v2.1.282
    Web search instructions can be extended remotely, and a stray option is ignored

    When fast web search is enabled, extra WebSearch tool instructions can be supplied remotely, and a mode value sent while it is off is dropped

    gate cited by this entry

Gate readings

2
ReleaseResolvedThis accountAnonymousCompiled default
v2.1.283 read on another version Not enough to say no value returned no value returned not a boolean we can read
v2.1.282 read on another version Not enough to say no value returned no value returned not a boolean we can read

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

2

The earliest release whose published evidence quoted tengu_sleepy_shore was v2.1.282, 24 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.28224 Sep 2026oi("tengu_sleepy_shore", null)
v2.1.28224 Sep 2026tengu_sleepy_shore

Presence across releases

1
BuildsHow manyDatesReading
v2.1.282 – v2.1.2832 builds24 Sep 2026 → 25 Sep 2026 ◆in the build

Build by build

2

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
v2.1.28224 Sep 2026·addedverdict: added · default null
v2.1.28325 Sep 2026·presentverdict: present · default null

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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