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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_file_read

A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

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

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

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

  1. v2.1.70

    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_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_name_uniquenessDuplicate session names on one machine now get a suffix automatically, and callers are told the new name. 2.1.232 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.