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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.

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Claude Code v2.1.251

How the evaluation subprocess environment is assembled

Under the hood
Useful1 Signal3
Plugin Eval not in their notes

The confined-evaluation flag is injected into eval child processes, confirming it's harness plumbing not a setting.

CLAUDE_CODE_EVAL_CONFINED
What

The confined-evaluation variable is written directly into a spawned child's environment, next to the artifact stub directory and an internal feature-flag override variable, confirming it is harness plumbing rather than a configuration key.

Details
  • Reaches file hard-link checks, artifact read locking, plan-mode denial forcing and subprocess environment construction.
  • No settings file or config lookup reads it.
Evidence

v.CLAUDE_CODE_EVAL_CONFINED = "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 v2.1.251 →