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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_walnut_spire

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.198, including the newest one read.

What it is

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

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.233.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.198 – 2.1.243 45 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

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.235 Off in both readings off off on
v2.1.233 read on another version Off in both readings off off on
v2.1.207 read on another version Off in both readings off off on

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. v2.1.235plugin eval can be pointed at a different case directory

    Point plugin eval at any case directory with --eval-dir, still behind an early-access gate or env var.

    gate cited by this entry

  2. v2.1.233Plugin 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

  3. v2.1.233Grader 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

  4. v2.1.233Plugin 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

  5. v2.1.233The 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

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

    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_walnut, up to twelve of them.

tengu_walnut_gablePublishing an artifact now strips all nested preview wrappers, not just the outermost one. 2.1.234 tengu_walnut_prismNo description from anybody. 2.1.161 tengu_walnut_sconceAn alternate PR-review description exists but you'll always see the original one. 2.1.218

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.