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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_lantern_spool

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.176, including the newest one read.

What it is

A server flag can widen when subagent requests send the extended usage-limit header.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.246.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.176 – 2.1.243 61 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
v2.1.246 Off in both readings off off on
v2.1.217 read on another version Off in both readings off off 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. v2.1.246New flag can widen when the extended usage-limit header is sent

    A server flag can widen when subagent requests send the extended usage-limit header.

    gate cited by this entry

  2. v2.1.217rateLimitGraceActive Session State Field [In Development]

    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_lantern, up to twelve of them.

tengu_lantern_prismA Stats tab in /plugin shows skill usage and context costs, with /skill-doctor redirecting there. 2.1.198 tengu_lantern_sconceA status bar notice about usage limits and covered extra usage is built but switched off. never mined tengu_lantern_wickNo description from anybody. 2.1.217 tengu_lantern_wick_modeClaude could be nudged to wrap up or checkpoint during your usage-limit grace window, but nothing fires. 2.1.227

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.