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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_session_name_uniqueness

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.232, including the newest one read.

What it is

Duplicate session names on one machine now get a suffix automatically, and callers are told the new name.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.232.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.232 – 2.1.243 12 releases in the build — bool:true

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
v2.1.232 read on another version Off in both readings off off 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.

Changelog entries naming it

  1. v2.1.232Session names are made unique across live sessions on the same machine

    Duplicate session names on one machine now get a suffix automatically, and callers are told the new name.

    gate cited by this entry

  2. v2.1.232Sessions on the same machine no longer share a name

    Same-machine name clashes are resolved at startup, on rename and on recheck; the flag defaults on.

    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_session, up to twelve of them.

tengu_session_deep_search_toggledNo description from anybody. never mined tengu_session_file_readNo description from anybody. never mined tengu_session_forked_branches_fetchedNo description from anybody. never mined tengu_session_indexNo description from anybody. never mined tengu_session_memory_accessedNo description from anybody. never mined tengu_session_memory_deletedRating a session memory bad now just records the rating instead of deleting the memory. never mined tengu_session_memory_loadedNo description from anybody. never mined tengu_session_memory_ratedRating a session memory bad now just records the rating instead of deleting the memory. never mined tengu_session_memory_share_eventA prompt to share your transcript after rating a memory is built but never appears. never mined tengu_session_quality_classificationNo description from anybody. never mined tengu_session_resumedA hidden print-mode flag lets you name the turn a truncating resume should drop, refusing anything unexpected. never mined tengu_sessions_elevated_auth_disable_proactive_enrollmentUntrusted-device failures still recover automatically, and expired trusted-device sessions now tell you to run /login. 2.1.138

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.