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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.224 ·

Invoking the prototype skill directly starts prototype mode

Invoking the prototype skill yourself now actually starts prototype mode.

You'll notice New Features
JSON All of v2.1.224
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
New FeaturesKind: in v2.1.224,
New FeaturesSection of the release
What

Calling the prototype skill yourself now marks prototype mode as started, as invoking it any other way already did. This does not happen when the skill is only being preloaded or when the model scheduled the invocation itself.

Evidence

prototype_started

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

See this entry in the whole of v2.1.224 →

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