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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.

← All of v2.1.239 Home All releases ←olderv2.1.238 v2.1.240newer→
Claude Code v2.1.239

One shared test for whether a run is headless

Under the hood
Useful1 Signal1
CLI

One shared check now decides whether a run is non-interactive, covering print mode and piped output.

-p--print--init-only
What

A single helper now decides that a run is non-interactive, covering -p, --print, --init-only, any argument starting with --sdk-url, and stdout not being a terminal.

Evidence

--init-only

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 v2.1.239 →