Tell agents the why, not just the how: prompt with goals, not specs

rseroter · x · 2026-09-16

Sean Goedecke's post "Tell agents the why, not just the how" argues: early agents were enthusiastic idiots needing precise instructions; today's frontier models go wrong not from confusion but from incorrect assumptions about your goals and priorities. E.g. GPT-6 Astra, when it thinks code is for itself, produces minified code — it can write readable code, but you must tell it humans will read it.

His key advice: give the agent context on your priorities, not just the specific task. He shares a real starting prompt (project Deckard): stating a long-term goal (a local tool/browser extension to detect and hide AI content) and short-term goals (find an efficient detection model for his MacBook — maybe Pangram's EditLens 3B or a smaller Roberta, possibly quantized), and letting the agent work via Runpod through MCP.

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