This example shows how to use @AutoGen.Gemini.GeminiChatAgent to make function call. This example is modified from [gemini-api function call example](https://ai.google.dev/gemini-api/docs/function-calling)
To run this example, you need to have a project on Google Cloud with access to Vertex AI API. For more information please refer to [Google Vertex AI](https://cloud.google.com/vertex-ai/docs).
> You can find the complete sample code [here](https://github.com/microsoft/autogen/blob/main/dotnet/samples/AutoGen.Gemini.Sample/Function_Call_With_Gemini.cs)
### Step 1: Install AutoGen.Gemini and AutoGen.SourceGenerator
First, install the AutoGen.Gemini package using the following command:
```bash
dotnet add package AutoGen.Gemini
dotnet add package AutoGen.SourceGenerator
```
The AutoGen.SourceGenerator package is required to generate the @AutoGen.Core.FunctionContract. For more information, please refer to [Create-type-safe-function-call](../Create-type-safe-function-call.md)
