Ollama doesn't support MCP

Throws a NotSupportedException when BackendType.Ollama is used with MCP integration, clarifying that Ollama models are not supported. This improves error handling and provides clearer feedback to developers.

Author: Madzionator

src/MaIN.Services/Services/McpService.cs

@@ -117,6 +117,9 @@ private PromptExecutionSettings InitializeChatCompletions(IKernelBuilder kernelB
                     FunctionChoiceBehavior = FunctionChoiceBehavior.Auto(options: new() { RetainArgumentTypes = true })
                 };
 
+            case BackendType.Ollama:
+                throw new NotSupportedException("Ollama models does not support MCP integration.");
+
             case BackendType.Self:
                 throw new NotSupportedException("Self backend (local models) does not support MCP integration.");