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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeReleasesv2.1.251entry #326

Claude Code v2.1.251 ·

Eval runs refuse to write into an existing default results directory

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

You'll notice No documentation found Internal Changes
JSON All of v2.1.251
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Plugin EvalArea: what it touches
Internal ChangesKind: in v2.1.251,
Internal ChangesSection of the release
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.

Read from
Names in the bundle--output-dir
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up --output-dir, on Plugins reference. This table lists the options most runs use. Run `claude plugin eval --help` for the complete set, including `--case`, `--tag`, `--output-dir`, `--report`, `--allow-real-servers`, `--keep-temp`, and `--verbose`. plugins-reference see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up --output-dir, on Plugins reference.

See this entry in the whole of v2.1.251 →

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