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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_kairos_brief

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.138, including the newest one read.

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 — —
2.1.138 – 2.1.243 95 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

  1. v2.1.72Brief Mode (Compact Chat View)

    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_kairos, up to twelve of them.

tengu_kairos_brief_config/brief is hidden by server config, but brief mode still works via an environment variable. 2.1.138 tengu_kairos_brief_stop_hook_textNo description from anybody. 2.1.138 tengu_kairos_dreamNo description from anybody. never mined tengu_kairos_input_needed_pushNo description from anybody. 2.1.138 tengu_kairos_loop_dynamicCheckpoints now record self-scheduling wake counts and open artifact watches, though the loop itself is off. 2.1.138 tengu_kairos_loop_keepaliveThe kite network transport is on by default everywhere, and CLAUDE_CODE_HARBOR_KITE=0 now really turns it off. 2.1.157 tengu_kairos_loop_persistentThe /loop tick prompt is no longer behind a remote flag and works for everyone. 2.1.138 tengu_kairos_loop_promptThe Kairos loop prompt is hardcoded off and its remote switch is gone from the build. 2.1.138 tengu_kairos_push_notificationsA tool letting Claude push notifications to you stays off by default. 2.1.138 tengu_kairos_ready_nudgeNo description from anybody. 2.1.211

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.