Message Placeholders in Chat Prompts
Nimar BlumeInject context or message history into your chat prompts at just the right spot.
With Message Placeholders, easily inject message histories (or other context) into chat prompts at defined positions. Add a placeholder message in your chat prompt and fill it in with a list of chat messages in the SDKs. You can also try it in the playground, add a placeholder and provide a list of chat messages to fill in. Experiments are supported as well, if your dataset contains for example a chat history named after a placeholder in your prompt, it’s evaluated.
In the SDKs, you can fill in values for placeholders by calling the compile(variables, placeholders) method.
To get a Langchain compatible prompt, use the getLangchainPrompt(...) method.
Unresolved placeholders will be returned as a Langchain MessagesPlaceholder object for further processing.
Note: to use Message placeholders with SDKs, you need to run at least langfuse-python >= 3.1.0 or langfuse-js >= 3.38.0.