n8n agent outputting tool name, but not running tool

I'm running an agent in n8n that simply needs to choose between 8 different tools.

I was using gpt-4o-mini but getting inconsistent results. I've changed to gpt-4-turbo and the results are much better. However, it outputs the tool name as json, instead of actually calling the tool, something like

```

[

{

"output": "sendEmailTool"

}

]

```

Any ideas on how to make it actually call the tools? It's a tools agent and with gpt-4o-mini the tools were being called (although not all of the time).

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