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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

Connection errors show the underlying cause

You'll notice
Useful3 Signal1
Internals

Connection failures now show the real underlying error text.

What

Generic connection failures now surface the text of the real underlying error instead of a bare, uninformative message.

Details
  • New helpers walk up to five levels of nested error causes to find the first informative message.
  • Errno-shaped codes are recognised: anything matching E followed by capitals or digits, plus UNKNOWN and text starting with "Unknown system error".
Evidence

Unknown system error

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

See this entry in the whole of v2.1.228 →