tengu_walnut_spire

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.198 and was gone by v2.1.269.

Releases whose published page names tengu_walnut_spire.

1. v2.1.235 18 Aug 2026
   plugin eval gains --eval-dir and a manifest eval directory, still early access

   plugin eval gets a configurable case directory via --eval-dir or a manifest key, still gated as early access

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

2. v2.1.233 14 Aug 2026
   Plugin eval checks your credentials before running any case

   Plugin eval checks your credentials first and aborts instead of failing every case.

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

3. v2.1.233 14 Aug 2026
   Grader summaries in plugin eval are scrubbed before truncation

   Grader summaries in plugin eval are stripped of escape characters before printing.

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

4. v2.1.233 14 Aug 2026
   Plugin eval tells the model the env var that turns it on

   Setting CLAUDE_CODE_WALNUT_SPIRE=1 turns on the early-access plugin eval command.

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

5. v2.1.233 14 Aug 2026
   The built-in guide agent can answer questions about plugin eval and /skill-doctor offline

   The built-in guide agent can now answer about plugin eval and /skill-doctor from bundled reference text.

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

6. v2.1.207 10 Jul 2026
   Walnut Spire (plugin eval General Availability) [In Development]

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

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.

No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.

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.