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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 v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

A new environment variable name is recognised but never read

Not switched on
Useful1 Signal4
Environment Variables Notable not in their notes

A new auth-adjacent variable name is listed but nothing in this build reads it.

CLAUDE_CODE_ARG_KEY_SHAPE is registered as auth-adjacent but nothing reads or writes it in this build.

CLAUDE_CODE_ARG_KEY_SHAPE
What

The list of environment variable names Claude Code treats as auth-adjacent gained CLAUDE_CODE_ARG_KEY_SHAPE. Unlike the other names in that list, nothing else in this build reads or writes it, so setting it changes nothing today.

Evidence

CLAUDE_CODE_ARG_KEY_SHAPE

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 v2.1.251 →