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March 12, 2025

Prompt Composability

Hassieb Pakzad

Create modular, reusable prompts by referencing existing prompts within other prompts.

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
• Prompt Management