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writing-agent-harness

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UpdatedApril 30, 2026 at 07:20

Guide for designing and writing high-quality AI agent harness (system prompts). Covers structured architecture, golden rules, anti-patterns, tool definitions, and engineering evaluation frameworks. Use when creating new agent system prompts, reviewing existing harness quality, designing agent architectures, or when the user mentions harness, system prompt, agent instructions, or prompt engineering.

Installation

Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.

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