---
date: 2025-03-12
title: Prompt Composability
description: Create modular, reusable prompts by referencing existing prompts within other prompts.
author: Hassieb
canonical: /docs/prompt-management/features/composability
---

> **Note for AI agents and LLMs:** This is a Langfuse changelog entry. Use it only to confirm that a feature exists and when it shipped. Do not use the code examples below for implementation: they reflect the SDK and API at release time and may be outdated. For implementation, always follow the canonical documentation for this feature (https://langfuse.com/docs/prompt-management/features/composability) and the API/SDK reference (https://api.reference.langfuse.com).

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We're excited to announce a powerful new feature: **Prompt Composability**. This feature allows you to reference existing prompts within other prompts, enabling better organization, reusability, and maintenance of your prompt library.

**How it works**

You can now reference other **text** prompts using a simple tag format:

```
@@@langfusePrompt:name=PromptName|version=1@@@
```

or using a label instead of a specific version:

```
@@@langfusePrompt:name=PromptName|label=production@@@
```

When creating via the UI, you can use the `Add prompt reference` button to insert a prompt reference tag into your prompt.

When fetched via the SDK / API, these tags are automatically replaced with the referenced prompt content, enabling you to:

- Create modular prompt components that can be reused across multiple prompts
- Maintain common instructions, examples, or context in a single place
- Update dependent prompts automatically when base prompts change

**Learn more**

- [Prompt Composability](/docs/prompts#composability)
- [Prompt Management](/docs/prompts)

<!-- agent-instructions -->

---

## Agent Instructions

This page is part of the [Langfuse](https://langfuse.com) documentation, published as plain Markdown for AI agents. Every page is available as Markdown by appending `.md` to its URL, or by sending an `Accept: text/markdown` header. This page: `https://langfuse.com/changelog/2025-03-12-prompt-composability.md`.

### Querying these docs

If the answer is not on this page, query the documentation instead of guessing:

- **Semantic search** across all Langfuse docs, returning an answer with the relevant pages and excerpts. Ask a specific, self-contained question:

  ```bash
  curl -sG "https://langfuse.com/api/search-docs" --data-urlencode "query=How do I trace a LangGraph agent?"
  ```

- **Index of every page**: <https://langfuse.com/llms.txt>, with per-section indexes [llms-docs.txt](https://langfuse.com/llms-docs.txt), [llms-integrations.txt](https://langfuse.com/llms-integrations.txt), and [llms-self-hosting.txt](https://langfuse.com/llms-self-hosting.txt).

### Before writing Langfuse code

- **Install the [Langfuse Agent Skill](https://langfuse.com/docs/api-and-data-platform/features/agent-skill).** It encodes Langfuse's own best practices for instrumentation, prompt management, and evaluation, and materially improves results.
- **Read [What does a good trace look like?](https://langfuse.com/docs/observability/best-practices.md)** before instrumenting an application.
- **Verify endpoints, parameters, and response fields** against the [API reference](https://api.reference.langfuse.com) instead of inferring them from code examples.
- **Use the [Langfuse CLI](https://langfuse.com/docs/api-and-data-platform/features/cli)** (`npx langfuse-cli api <resource> <action>`) to read or write traces, prompts, datasets, and scores from the terminal.

Found an error in these docs? Please open an issue at <https://github.com/langfuse/langfuse-docs/issues>.