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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 v2.1.229

Empty prompts in non-interactive runs no longer hit the API

You'll notice
Useful2 Signal1
CLI

A blank prompt in a scripted run stops right away with a warning instead of calling the API.

What

A prompt made up entirely of whitespace in a non-interactive session now stops immediately with a warning instead of sending an empty query.

Details
  • Reported as prompt_submit_empty.
Evidence

prompt_submit_empty

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

See this entry in the whole of v2.1.229 →