Source Intelligence

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.

All of v2.1.233 Home All releases olderv2.1.232 v2.1.234newer
Claude Code v2.1.233

Plugin eval tells the model the env var that turns it on

Use it now
Useful3 Signal5
Plugin Eval Notable not in their notes

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

Feature flag
tengu_walnut_spire Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.233: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.233. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_WALNUT_SPIREclaude plugin eval
What

When the early-access claude plugin eval command is enabled, Claude is now told the enabling variable is CLAUDE_CODE_WALNUT_SPIRE=1, settable in your shell or in the env block of user or managed settings, for machines outside the per-organization rollout. When it is not enabled, Claude is told to call it early access and never guess a variable name.

Details
  • The gate itself is unchanged: the remote flag tengu_walnut_spire, which defaults to off, or the environment variable.
Evidence

CLAUDE_CODE_WALNUT_SPIRE=1

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.233 →