Feature request: native advisor strategy support

Feature Request

Add native support for the advisor strategy in Claude Code, allowing users to pair a faster executor model with a more capable advisor model.

What is the advisor strategy?

The advisor tool (beta header advisor-tool-2026-03-01) pairs a cheaper executor model with a higher-capability advisor. The executor runs the task and consults the advisor mid-generation when it encounters hard decisions. This happens within a single API request, providing better results at lower cost.

For example, Sonnet 4.6 as executor + Opus 4.7 as advisor shows a 2.7pp improvement while reducing cost 11.9% compared to Opus alone.

Proposed UX

A setting in settings.json or .claude/settings.json to configure the advisor model, e.g.:

{
  "advisor": {
    "model": "claude-opus-4-7"
  }
}

Or a CLI flag like --advisor claude-opus-4-7.

This would let Claude Code users get better results from cheaper models (Haiku, Sonnet) by having Opus available as an advisor, without needing to build a custom API integration.

Why this matters

The advisor strategy is already available at the API layer. Surfacing it in Claude Code would let CLI users benefit from the same cost/quality tradeoffs without leaving the tool.