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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 v2.1.228

Environment variables read through one typed accessor

Under the hood
Useful2 Signal2
Environment Variables not in their notes

Environment flags are now parsed centrally, so values are compared to explicit true or false.

CLAUDE_CODE_WORKFLOWS
What

Direct process.env reads were replaced with a shared env object across terminal detection, scroll telemetry, git-bash resolution, editor selection, Bedrock and Vertex selection, workflows and MCP. Truthiness parsing is now centralized, so variables like CLAUDE_CODE_WORKFLOWS are compared to explicit true/false rather than tested loosely.

Details
  • CLAUDE_CODE_DISABLE_CLAUDE_API_SKILL now passes a disabled option to the skill registrar instead of skipping registration entirely.
  • Behaviour is intended to be unchanged.
Evidence

CLAUDE_CODE_DISABLE_CLAUDE_API_SKILL

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 v2.1.228 →