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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.

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Claude Code v2.1.116

/fast Command (Non-Interactive Variant)

What

New local command to toggle fast mode on or off, with support for non-interactive invocation.

Usage
/fast        # Toggle fast mode
/fast on     # Enable fast mode
/fast off    # Disable fast mode
Details
  • Works as both an interactive (JSX) and non-interactive local command
  • Accepts [on|off] arguments
  • Only available when fast mode is supported for the current model
Evidence

Fast command definition (search for name: "fast") — CB7 at line ~530978

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

See this entry in the whole of v2.1.116 →