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You Can’t Prompt-Engineer Your Way to Reliable Agents. Wire the Architecture Around It.

Domain 1 Capstone: Reliability is not in the prompt. It’s in the loop, the hooks, the policy gates that fire whether the model wants them to or not, and that the model can’t talk past.

You Can’t Prompt-Engineer Your Way to Reliable Agents. Wire the Architecture Around It.

TL;DR

  • Reliability in AI agents comes from architecture (loops, hooks, gates), not just prompting.
  • A PreToolUse hook prevented an AI from issuing an unauthorized refund by enforcing a $500 limit and manager approval rule.
  • A PostToolUse hook normalized inconsistent date formats from various data sources before the AI processed them.
  • Architectural components operate independently of the AI's reasoning, providing a robust enforcement mechanism.
  • The article emphasizes that prompts request actions, while architecture guarantees enforcement.