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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 v2.1.248 ·

System prompt can drop plugin details, and warms something on Windows

The system prompt can omit plugin and MCP error lists, and warms something extra on Windows.

Nothing to try yet In Development
JSON All of v2.1.248
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
System PromptArea: what it touches
In DevelopmentKind: in v2.1.248,
In DevelopmentSection of the release

A condition strips plugin details from the prompt; what makes it hold is not visible.

What

Prompt construction now awaits an extra warm-up step on Windows, and under a condition derived from the current configuration it sends empty plugin, plugin-error, plugin-warning and MCP-server-error lists instead of the real ones. What makes that condition hold is not visible from the built code.

Evidence

fastModeDisabledReason

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

See this entry in the whole of v2.1.248 →

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