fix(Hugging Face Inference Model Node, Embeddings Hugging Face Inference Node): Fix credential validation for HF nodes and add provider for (#18047)

packages/@n8n/nodes-langchain/nodes/llms/LMOpenHuggingFaceInference/LmOpenHuggingFaceInference.node.ts

@@ -55,7 +55,7 @@ export class LmOpenHuggingFaceInference implements INodeType {
 				displayName: 'Model',
 				name: 'model',
 				type: 'string',
-				default: 'gpt2',
+				default: 'mistralai/Mistral-Nemo-Base-2407',
 			},
 			{
 				displayName: 'Options',
@@ -139,6 +139,11 @@ export class LmOpenHuggingFaceInference implements INodeType {
 		const modelName = this.getNodeParameter('model', itemIndex) as string;
 		const options = this.getNodeParameter('options', itemIndex, {}) as object;
 
+		// LangChain does not yet support specifying Provider
+		// That's why mistral's model is the default value
+		// It is one of the few models that seem to work out of the box
+		// Other models are returning "Model x/y is not supported for task text-generation and provider z. Supported task: conversational."
+		// https://github.com/langchain-ai/langchainjs/discussions/8434#discussioncomment-13603787
 		const model = new HuggingFaceInference({
 			model: modelName,
 			apiKey: credentials.apiKey as string,