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Delimiters, XML Tags, and Structured Prompting (SOLVED)

Project BasedPrompt EngineeringEasy8 min read

Structured prompting patterns using tags and boundaries to separate instructions, context, tools, and user input in production LLM apps.

TL;DR — Quick Answer

Delimiters and XML tags create explicit boundaries between instructions, context, examples, and user input so models parse roles more reliably. They reduce bleed between sections, help with injection resistance, and pair well with tool-calling and RAG. Use them whenever multiple content types share one prompt.

The Interview Question

Explain how delimiters and XML-style tags improve prompt reliability. When should you structure prompts this way?

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XML TagsDelimitersStructured PromptsRAGAnthropicOpenAI

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