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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 v2.1.139

Proactive Output Style

What

A new built-in Proactive output style makes Claude act more autonomously: execute immediately, minimize interruptions, and prefer action over planning.

Usage
claude
# Open /config and set Output style to Proactive
Details
  • Adds Proactive alongside existing built-in output styles.
  • Uses a dedicated style prompt, not just a generic reminder.
  • Adds a shorter per-turn reminder: Execute autonomously, minimize interruptions, prefer action over planning.
  • This is a fully built-in style; no plugin is required.
Evidence

Built-in output style definition (search for "Proactive Style Active", "Claude executes immediately, minimizes interruptions, and prefers action over planning")

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

See this entry in the whole of v2.1.139 →