Foundry Agents not working with GPT-5

[for-shariq]

I am creating a Foundry Agent and attaching an Azure AI Search function tool to ChatClientAgentRunOptions. This works with GPT-4.1 but the tool is not called when using GPT-5, the response is empty. Models are deployed in Foudry Project

[moonbox3]

Hi @for-shariq, there's no other error message returned in the response? The response does succeed but with empty text?

[moonbox3]

@for-shariq are you able to see any content types within the response? If there's a tool call, it could show empty text. Any more info around the actual response you receive, and what is actually present will help us diagnose/debug. Thanks.

[for-shariq]

@moonbox3 Here is the response object. I am an executing agent using:
agent.RunAsync(message: question, thread, options: agentOptions) // thread is created using GetNewThread()

[moonbox3]

Thanks. Let me follow up with the Agent Service team. Will get back to you when I have an update.

[moonbox3]

@for-shariq working with internal teams to investigate the issue around this.

[apryiomka]

can you share the user prompt / message and function tool config? It is hard to infer from the screenshot.