# Prompt registry

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

> A prompt registry is the versioned, searchable store of production prompts shared across an organization — Vellum, PromptLayer, Langfuse, Braintrust ship one. Source of truth instead of prompts scattered across code + docs.

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A prompt registry is the versioned, searchable store of production prompts shared across an organization — Vellum, PromptLayer, Langfuse, Braintrust ship one. Source of truth instead of prompts scattered across code + docs.

Prompts in code are hard to find, version, and improve across teams. Prompt registries centralize: every prompt has a name + version + content + linked evals + deploy status, edits go through review, deploys are explicit. Production patterns: code references prompt by name + version (`prompt:welcome-message@v3`), registry serves the content at runtime, version bumps trigger eval runs, rollback is one click. Comparable to feature flags but for prompts. Tools differ on integration depth: Vellum + HumanLoop emphasize cross-team UX, Langfuse + Braintrust pair registry with deep eval pipeline, PromptLayer + PromptHub focus on the registry primitive. By 2026 every serious AI team uses some form of prompt registry — even if it's a YAML file + linter.

## When to use

- Multi-team AI products.
- Production prompts requiring versioning + rollback.

## Common mistakes

- Treating it as write-only — never reviewing or pruning old versions.
- Bypassing the registry in 'just one' urgent change — collapses governance.

## Related terms

- [prompt-versioning](https://promtable.com/glossary/prompt-versioning)
- [ab-testing-prompts](https://promtable.com/glossary/ab-testing-prompts)
- [evals-driven-development](https://promtable.com/glossary/evals-driven-development)

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