Claude Code ships experimental advisor tool to consult a stronger model at key moments

anshulkundaje · x · 2026-09-25

Anthropic's Claude Code docs now include an experimental advisor tool (Anthropic API only) that lets your main model consult a typically stronger model at key moments — before committing to a plan, when stuck on a recurring error, or before declaring a task done. The advisor reads the full conversation and gives advice while the main model still writes the code.

The thread shares a practical setup: Opus 5.5 on high for the main session, three medium-tier subagents for reading code, editing/testing, and docs lookup, plus /advisor fable to put idle Fable quota on the sidelines as an advisor.

It also cites Anthropic's official Opus 5.5 guide: delete prompts like "think carefully" or "take a deep breath" from CLAUDE.md, since the model already decides how much to think — removing them speeds up responses with no quality drop.

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