Source Intelligence

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 v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Eval runs refuse to write into an existing default results directory

You'll notice
Useful2 Signal2
Plugin Eval not in their notes

Eval runs refuse to write into a results directory that already existed.

--output-dir
What

When results go to the default location rather than one given with --output-dir, the tool now verifies the directory it just created is new and fails if a directory of that name already existed, instead of writing into whatever was there.

Evidence

results directory ${Se} already existed — a default results directory is always new; refusing to write into it

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 →