# Structured prompt

**Source:** https://promtable.com/glossary/structured-prompt

> A structured prompt has explicit sections (role, task, constraints, format, examples, input) instead of free-form prose — the dominant pattern for production LLM prompts in 2026.

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A structured prompt has explicit sections (role, task, constraints, format, examples, input) instead of free-form prose — the dominant pattern for production LLM prompts in 2026.

Free-form prompts ("please summarise this and make it short") underperform structured prompts on production workloads. Structured prompts use explicit sections (XML tags for Claude, markdown headers for GPT, named blocks for Gemini) so the model has unambiguous separation between role, task, input data, constraints, and output format. The technique meaningfully improves reliability, makes prompts easier to version, and lets multiple authors collaborate on the same prompt. Modern frameworks (Pydantic-AI, Mastra, Vercel AI SDK) treat structured prompts as the default.

## When to use

- Any production LLM feature.
- Multi-author prompt collaboration.

## Common mistakes

- Excessive structure on trivial prompts — overhead without benefit.
- Inconsistent section names across prompts — defeats the maintainability gain.

## Related terms

- [system-prompt](https://promtable.com/glossary/system-prompt)
- [prompt-engineering](https://promtable.com/glossary/prompt-engineering)
- [prompt-template](https://promtable.com/glossary/prompt-template)

*Last updated: 2026-06-01*
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Original page: https://promtable.com/glossary/structured-prompt
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