Copilot Studio on VSCode doesn't recognize System variable

Question

Hello, it seems that the copilot studio extension doesn't recognize the system variable System.ConversationContext.PreviousConversationSummary, any solutions?

Answer 1

Hello Guilherme Garcês Santos

System.ConversationContext.PreviousConversationSummary isn’t currently a documented or supported Copilot Studio system variable. Therefore, the VS Code validation error is expected when that expression is entered manually.

Depending on your requirement, use:

• System.Activity.Text for the latest user message.
• System.LastMessage.Text for the previous user message.
• A topic/global variable that your topic maintains and passes explicitly to the prompt when you need accumulated conversation context or a custom summary.

Please also test the expression in the Copilot Studio web topic code editor. If the web portal accepts, publishes, and successfully runs the exact expression, but an unchanged cloned topic is rejected only by the latest VS Code extension, that would indicate an extension validation defect rather than unsupported syntax.