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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_slate_meadow

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.138 and was gone by v2.1.141.

What it is

Nobody has written a line about this one. It is not in any of Anthropic's reference tables and no changelog entry here carries a description of it. It is in the build, which is the whole of what this page can claim.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.141 – 2.1.243 92 releases not in the build — —
2.1.138 – 2.1.140 3 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

No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.

Changelog entries naming it

No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.138 without anybody writing a line about it.

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_slate, up to twelve of them.

tengu_slate_anchorSome feature flags now stay fixed for the whole session, including a new one that is on. never mined tengu_slate_fernNo description from anybody. 2.1.172 tengu_slate_finchNo description from anybody. 2.1.138 tengu_slate_harborREPL contexts moved to a registry that releases timers even on error paths. 2.1.138 tengu_slate_harbor_experimentNo description from anybody. 2.1.138 tengu_slate_harrierClaude no longer spends up to a minute investigating before asking you a clarifying question. 2.1.138 tengu_slate_heronNo description from anybody. never mined tengu_slate_ibisExplore and plan agents are now always on unless you set the disable environment variable yourself. 2.1.217 tengu_slate_kestrelNo description from anybody. 2.1.138 tengu_slate_lanternA new --watch-artifact flag follows a claude.ai artifact for new versions and comments, but needs account access. 2.1.198 tengu_slate_lantern_emberRe-armed artifact watches could reuse an existing connection instead of starting over, but the flag is off. 2.1.236 tengu_slate_mothNo description from anybody. 2.1.191

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.