Passing parameters to RestAPI in AI Agent Tools

Hi Team,

I am attempting to connect to the CPQ system using REST API via AI Agent Tools. The API URL works correctly in Postman and returns the expected response. However, when I try to execute the same request in AI Agent Tools, it fails with a generic “Agent unavailable” error whenever query parameters are included.

Working URL in Postman:

https://{InstanceURL}/{ResourcePath}/?q={ItemNumber:"ABCD"}

Query parameter formats attempted in AI Agent Tools (both unsuccessful):

{InstanceURL}/{ResourcePath}?q=%7BItemNumber%3A'{pitemnumber}'%7D

{InstanceURL}/{ResourcePath}?q={ItemNumber:'{pitemnumber}'}

Please advice on the possible issue with the syntax