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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 ·

New guardrails in the model's instructions

Claude is now told not to fake clicks, touch shell startup files, or call tools during summaries.

You'll notice Improvements
JSON All of v2.1.248
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
System PromptArea: what it touches
ImprovementsKind: in v2.1.248,
What probably matters to youSection of the release
What

Four instruction fragments were added: the model must not use AppleScript, System Events or shell commands to fake clicks and keystrokes, must not save files into shell startup files, ssh keys or launch agents, must not claim it is editing an artifact page, and must not make tool calls during an analysis or summary step.

Details
  • These are prompt text, so they shape behaviour rather than hard-blocking the actions.
Evidence

System Events, shell commands, or any other method to send clicks or keystrokes to this app.

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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