Route Three Brain

route-three-brain

Family: routing Status: Stable

Purpose

The decision layer for cross-model routing. Three models, three roles:

• Claude — primary driver for code, content, design generation, conversation.
• Codex / GPT-5.5 — adversarial review, second-opinion debugging, deep

correctness/security checking.

• Gemini — large-context whole-repo analysis, multi-document synthesis, big

structured-data passes.

Hard rule: Claude never reviews Claude — same architecture, same blind spots. If the user says "check your work" / "review this" / "is this right" / "second opinion" / "sanity check," route to Codex via route-codex-review.

Triggers

• "three brain" / "tri-brain" / "route this" / "which model"
• "delegate to codex" / "delegate to gemini" / "best model for X"

Inputs

• Task description; the current output (if asking for review/handoff)
• Constraints (cost, time, privacy)

Steps

1. Startup self-check (once per session). Verify the tools exist:

codex --version and gemini --version. If one is missing, announce it once and route only to what's available.

1. Classify the task:

• Build/generate/converse → Claude keeps it.
• Review / verify / debug a substantial output, or any risk-path edit (auth,

billing, migrations, deploy, secrets) → Codex via route-codex-review.

• Needs more context than one window (whole repo, many docs) → Gemini via

route-gemini-context.

1. Announce forced routes in one line before running (so the user can interrupt):

[three-brain] routing to Codex (review) — risk path: src/auth/.

1. Execute the handoff via the execution skills and integrate the result —

diff where models agree/disagree and adjudicate by evidence, not by averaging.

Outputs

• A routing decision with justification
• The integrated result of any executed handoff

Dependencies

• route-codex-review (Codex execution), route-gemini-context (Gemini execution)
• The codex and gemini CLIs installed (or the adjacent openai-codex /

cc-gemini-plugin tools); degrades to a recommendation when neither is present

Notes

The law layer; the two route-* skills are the execution layers. Under-firing is fine; over-firing breaks trust. When uncertain, recommend rather than auto-route.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: ZachArticulateV
• Source: ZachArticulateV/designer-pro-and-seo
• License: MIT

Install and usage instructions live in the source repository linked above.