What is Prompt Engineering?
Prompt engineering is the practice of designing and optimizing input text to guide large language models toward producing desired outputs, including techniques like few-shot examples, system prompts, and structured instructions.
WHY IT MATTERS
Prompt engineering is how humans communicate intent to LLMs. A well-crafted prompt can be the difference between a useful agent and a confused one. It encompasses everything from writing clear instructions to providing examples, setting constraints, and structuring output formats.
For agent developers, prompt engineering defines the agent's behavior and decision-making framework. A financial agent's system prompt might specify risk tolerance, permitted actions, and output formats.
But here's the critical insight: prompts are suggestions, not guarantees. An LLM can deviate from prompt instructions, especially under adversarial conditions or edge cases. Prompt engineering is a first line of defense, not a security boundary.
HOW POLICYLAYER USES THIS
Prompt engineering tells an agent what it should do. PolicyLayer enforces what it can do. Even the best-engineered prompt can be circumvented by jailbreaks or hallucinations — PolicyLayer provides the hard enforcement layer that prompts alone cannot deliver.