AI Agent Studio 26C - External REST GET dynamic query parameter regression

Aug 12, 2026 2:32PM

Our External REST tool worked correctly before the 26C upgrade.

Oracle Fusion endpoint:
/fscmRestApi/resources/11.13.18.05/invoices

Required dynamic request:
?q=InvoiceNumber='00024631TAX'

Hardcoded query works correctly and returns:
HTTP 200
count = 1

After 26C, dynamic query parameter handling no longer works.

When parameter q is added in the External REST endpoint Parameters section, the runtime generates:

"query_dict": {
"fields": "q"
}

and Oracle Fusion returns HTTP 400:
"URL request parameter fields with value q is not valid."

When the parameter is removed, the runtime calls the invoices endpoint with an empty query_dict and retrieves unrelated invoices.

Using {invoiceNumber} in the query string sends the placeholder literally instead of substituting the runtime value.