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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 v2.1.76

/effort Slash Command

What

A new built-in slash command to view and set the model effort level directly from the REPL, without navigating into /config.

Usage
/effort              # Show current effort level
/effort medium       # Set to medium
/effort max          # Maximum reasoning depth (Opus 4.6 only)
/effort auto         # Reset to automatic (default)
Details
  • Effort levels: low, medium, high, max, auto
  • Named levels are persisted to user settings (effortLevel in settings.json)
  • auto clears the setting, returning to the model default
  • Each level has a descriptive summary (e.g. "Balanced approach with standard implementation and testing")
Evidence

/effort command registration (search for name: "effort", description: "Set effort level for model usage")

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 v2.1.76 →