Metaprompt

Given a goal, a target model, and a target harness, produces a complete, ready-to-use prompt engineered for that specific combination — researching current per-model and per-harness prompting techniques rather than relying on stale memorized guidance, then self-reviewing the draft against a quality checklist. Use when writing a prompt, system message, or agent instructions meant to run on a specific model (Claude, GPT-5.x, Gemini, etc.) inside a specific harness (Claude Code, Codex CLI, a custom agent loop, raw API, chat) — especially one that isn't the model/harness currently running this conversation.