26C AI Agent – External REST Tool (POST) Drops/Omits Parameter When Value is Empty String or Null

Summary:

When configuring a Workflow Agent to call an external REST POST endpoint, any input parameter whose value is set to an empty string ("") or null is being completely omitted from the outgoing JSON payload, instead of being sent as an empty/null field. This breaks integration with downstream REST APIs that explicitly require the key to be present in the payload — even with an empty or null value — for correct processing.

Content (please ensure you mask any confidential information):

• Create a Workflow Agent in AI Agent Studio.
• Add an External REST Tool with method POST, pointing to an endpoint that expects a JSON body such as: