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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

What the confined mode changes across cloud, permissions and plugin loading

Under the hood
Useful2 Signal4
Plugin Eval not in their notes

Confined mode also blocks cloud sessions and changes how MCP servers and hooks load.

CLAUDE_CODE_EVAL_CONFINED
What

The same confined-evaluation flag also stops cloud and background session creation, restricts always-allow rules to command-line sources, alters file hard-link and settings-source checks, and changes how MCP servers and hooks are loaded.

Details
  • Cloud session refusal surfaces as the reason eval_confined.
  • The flag is written by Claude Code when spawning its own subprocess, not read from user config.
Evidence

eval_confined

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 →