# Prompt versioning

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

> Prompt versioning is the discipline of treating prompts as source-controlled artefacts — each prompt has a versioned ID, a deploy history, and a regression-tested change log.

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Prompt versioning is the discipline of treating prompts as source-controlled artefacts — each prompt has a versioned ID, a deploy history, and a regression-tested change log.

By 2026 every credible production LLM team versions prompts the way they version code: prompts live in source control or a dedicated prompt registry (Braintrust, Vellum, PromptLayer, Langfuse), every prompt change ships through a review + eval pipeline, and a stable prompt ID lets you trace which version produced which generated output in tracing data. Versioning enables A/B testing prompts in production, rolling back a bad change, and analysing performance drift over time. Treating prompts as untracked strings is the most common source of silent quality regressions in production LLM apps.

## When to use

- Any production LLM feature.
- Multi-prompt agent systems.
- Teams larger than one person.

## Common mistakes

- Storing prompts as inline strings — un-tracked, un-versioned.
- Shipping prompt changes without running the eval suite.
- Missing version IDs in traces — you can't debug what you can't pin to a version.

## Related terms

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

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