tengu_curious_tower

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.265, including the newest one read.

Releases whose published page names tengu_curious_tower.

1. v2.1.296 9 Oct 2026
   Tether reminder can now be switched on by an additional condition

   The tether live check and its kept-reminder mode now also turn on when a further condition is met, besides the environment variable or server setting

   gate cited by this entry

2. v2.1.281 23 Sep 2026
   CLAUDE_CODE_TETHER_LIVE=true now opts in to several related threads/tether features and bypasses first-party checks

   CLAUDE_CODE_TETHER_LIVE=true now also turns on related threads features and skips some endpoint checks

   gate cited by this entry, found in this entry's text

3. v2.1.281 23 Sep 2026
   New env vars CLAUDE_CODE_TETHER_LIVE and CLAUDE_CODE_MCP_APPS_HOST added to the protected env-key set

   CLAUDE_CODE_TETHER_LIVE and CLAUDE_CODE_MCP_APPS_HOST join Claude Code's protected set of environment variables

   gate cited by this entry, found in this entry's text

4. v2.1.265 8 Sep 2026
   New "tether" request-threading protocol for API continuity (gated, off by default)

   New gated 'tether' system can thread API requests together server-side instead of resending full context each turn

   gate cited by this entry, found in this entry's text

5. v2.1.265 8 Sep 2026
   New telemetry: tether decision/outcome/echo-audit events

   New telemetry events track the tether feature's threading decisions, outcomes, and echo audits

   gate cited by this entry

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.

One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.

The earliest release whose published evidence quoted tengu_curious_tower was v2.1.265, 8 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

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.