Here I found an issue when creating an inference tool from the JS API.

Version

"@huggingface/inference": "^2.8.0" with npm installation

Description

1. The issue is that the delta of the tool call (ChatCompletionStreamOutputDeltaToolCall ) is a type of "number", but the full result (ChatCompletionStreamOutputDeltaToolCall) is identified by "string"

// At @huggingface\tasks\src\tasks\chat-completion
export interface ChatCompletionOutputToolCall {
	function: ChatCompletionOutputFunctionDefinition;
	id: number;
	type: string;
	[property: string]: unknown;
}

// At @huggingface\tasks\src\tasks\chat-completion
export interface ChatCompletionStreamOutputDeltaToolCall {
	function: ChatCompletionStreamOutputFunction;
	id: string;
	index: number;
	type: string;
	[property: string]: unknown;
}

2. The ChatCompletionStreamOutputDelta.tool_calls type is ChatCompletionStreamOutputDeltaToolCall but might be a mistake as that should be the ChatCompletionStreamOutputDeltaToolCall[] (Array of calls instead of a single object, this one needs some help of explanation.

• Is the current API endpoint with stream only support a single tool result?
• But the full one is an Array ChatCompletionOutputMessage.tool_calls: ChatCompletionOutputToolCall[]

// At @huggingface\tasks\src\tasks\chat-completion
export interface ChatCompletionStreamOutputDelta {
	content?: string;
	role: string;
	tool_calls?: ChatCompletionStreamOutputDeltaToolCall;
	[property: string]: unknown;
}

// At @huggingface\tasks\src\tasks\chat-completion
export interface ChatCompletionOutputMessage {
	content?: string;
	name?: string;
	role: string;
	tool_calls?: ChatCompletionOutputToolCall[];
	[property: string]: unknown;
}

ScreenShot

Reference Link

If you want to check it out, here is the link can compare to almost the same code for OpenAI and HuggingFace. And the HuggingFace one have the above issue (OpenAI one is correctly work, hope can help to debug)
OpenAI Tool Use Inference
HuggingFace Tool Use Inference