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Brain Design.instructions

GPTClaudeDeepSeek··▲ 1,385 copies·updated 2026-07-14

brain-design-instructions.prompt

---
type: instruction
lifecycle: stable
inheritance: inheritable
description: "Brain architecture patterns — trifectas, muscles, agents, and the mechanical/semantic split"
application: "When designing automation, creating agents, or building complete capabilities"
applyTo: "**/*muscle*,**/*agent*,**/*trifecta*,**/*.cjs"
currency: 2026-04-27
---

# Brain Design Patterns

The brain is built from four artifact types. Each serves a distinct purpose.

## The Four Artifact Types

| Artifact | Location | Purpose | Invocation |
|----------|----------|---------|------------|
| **Skill** | `.github/skills/*/SKILL.md` | Domain knowledge | Read when relevant |
| **Instruction** | `.github/instructions/*.instructions.md` | Always-on behavior | Auto-loads via `applyTo` |
| **Muscle** | `.github/muscles/*.cjs` | Automation script | Run via terminal |
| **Agent** | `.github/agents/*.agent.md` | Specialist persona | Selected explicitly |

## Trifecta: Complete Capabilities

A **trifecta** is a complete capability built from three parts:

when to use it

Community prompt sourced from the open-source GitHub repo fabioc-aloha/Alex_ACT (no explicit license). A "Brain Design.instructions" style prompt — adapt the placeholders and specifics to your task. Imported as-is and not independently retested here, so check the output before relying on it.