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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 v0.2.90 Home All releases olderv0.2.89 v0.2.91newer
Claude Code v0.2.90

Tool Permission System

A new permission prompt system has been introduced for tool usage, providing better control over what actions Claude can perform.

Key components:

  • Tools can now prompt for permission before execution
  • Two permission behaviors: allow (with optional input modifications) or deny (with explanation)
  • Permission decisions are tracked with detailed reasoning

Example interaction: When Claude attempts to use a tool that requires permission, you'll see a prompt asking whether to allow the action. You can:

  • Allow the tool to proceed (optionally with modified parameters)
  • Deny the tool with a reason

See this entry in the whole of v0.2.90 →