Need employee agent to read parameters from query string associated with current URL

Hello @Purushottam Gangwar here is a VF old way to get them, but that concern VF page : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_quick_start_query_params_getting.htm

But for an agent, proceed with the data of the concerned record, by inserting the related fields in the prompt as resources. 

Eric