Nested Function Calls don't work

Google AI Studio
1

I’m trying to use function calls with nested definitions with the realtime model (gemini-2.0-flash-exp), but gemini returns an internal server error for such function calls.

image
image1858×996 73.9 KB

I’ve attached a simple tool to reproduce the error

[
  {
    "name": "add_numbers",
    "description": "adds two numbers",
    "parameters": {
      "type": "object",
      "description": "add number input",
      "properties": {
        "both_numbers": {
          "type": "object",
          "properties": {
            "first_number": {
              "type": "integer",
              "description": "The first number to add"
            },
            "second_number": {
              "type": "integer",
              "description": "The second number to add"
            }
          }
        }
      }
    }
  }
]

Is there a workaround to this? I have a few complex tools where nesting is absolutely required.

2

That is code execution; you can test function calls in a normal text model, but live, I don’t know.

4

No, this is not code execution. This is how the live model handles function calls (even when they work).
Look at the following screenshot

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image1646×825 84.5 KB

6

Function calls don’t seem to work in the live environment because the function must be defined on the server; if the function is not on the server, it will return an error.

7

Function calls do work in the live environment as well, just not when nested (like I mentioned in the original issue).
See the following screenshot

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image1671×938 61.2 KB

8

if so, don’t nest it.

10

Like I mentioned in the original issue, I have a few complex function calls where nesting is required.
Moreover, this seems like a bug on Gemini’s end, not an intended limitation. Their schema also supports nesting.