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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

New guardrails in the model's instructions

You'll notice
Useful3 Signal4
System Prompt

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

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.

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 v2.1.248 →