AI Agent Studio: Variables not resolving inside the RAG Document Tool Node "Question" parameter

Hi Everyone,

I am currently building a Workflow Agent within Oracle AI Agent Studio and running into an issue regarding variable substitution inside the RAG Document Tool Node.

The Setup:

• My workflow captures and stores specific dynamic values into workflow variables early in the process.
• I am trying to reference these variables inside the Question tab/parameter of the RAG Document Tool Node to dynamically filter or guide the search query.

The Problem: When the workflow executes, the variable notation does not seem to be replaced by the actual runtime value stored in the variable. Instead, the literal variable string appears to be passed to the RAG tool. As a result, the RAG engine fails to locate relevant text and returns "Information not found" or a similar fallback response.