Bug: Add initializer for ToolCallParam.FunctionCall

[dounan]

What

Add an initializer for ToolCallParam.FunctionCall

Why

Cannot initialize without it. I have a use case that requires me to initialize a ToolCallParam (instead of using one returned by the SDK).

Affected Areas

Chat Completion API

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nezhyborets]

Hi @dounan , for the better understanding and thus better review, what would be such a use-case? If it can be disclosed, of course

[dounan]

My app talks to various LLM backends so I have an internal representation of the chat that I then map to the request format of the LLM API I need.

In order to map to the OpenAI SDK request format, I have code that looks like this:

func adapt(_ toolCall: AIResponse.ToolCall) -> ChatQuery.ChatCompletionMessageParam.AssistantMessageParam.ToolCallParam {
        switch toolCall {
        case .function(let fnToolCall):
            return .init(
                id: fnToolCall.id,
                function: .init(
                    arguments: fnToolCall.argumentsJSON,
                    name: fnToolCall.name
                )
            )
        }
    }

Without this PR, I cannot initialize the value of the function field . I am open to alternatives though if there is a better way.