Prompt engineering is the practice of designing the instructions and context you give an AI model to get reliable results. For coding agents it includes clear task framing, relevant context, constraints, examples, and project-level instructions the agent should always follow.
As agents take on larger tasks, prompt engineering shifts from clever one-liners toward durable, reusable context — project instruction files, conventions, and guardrails that shape every run.
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Related guides on the Agents UI blog and related terms in this glossary.