I rewrote the system prompt fourteen times.
Version 3 was "be thorough." Version 7 was a 900-word manifesto about edge cases. Version 12 threatened the model if it hallucinated a file path. Version 14 still booked a meeting on the wrong calendar and cheerfully summarized the disaster.
The agent wasn't dumb. It was unarmed.
If you've been stuck in prompt-tweaking hell with an AI agent that keeps almost-working, this is the post I wish I'd read first. The fix usually isn't another paragraph of instructions. It's giving the thing a real tool.
Prompts are pep talks. Tools are hands.
