microsoft/autogen · error · InvalidOperationException

Invalid streaming message type {reply.GetType().Name}

Error message

Invalid streaming message type {reply.GetType().Name}

What it means

Error "Invalid streaming message type {reply.GetType().Name}" thrown in microsoft/autogen.

Source

Thrown at dotnet/src/AutoGen.AzureAIInference/Middleware/AzureAIInferenceChatRequestMessageConnector.cs:81

                if (update.Content.FunctionName is string functionName)
                {
                    currentToolName = functionName;
                }
                else if (update.Content.ToolCallUpdate is StreamingFunctionToolCallUpdate toolCallUpdate && toolCallUpdate.Name is string toolCallName)
                {
                    currentToolName = toolCallName;
                }
                var postProcessMessage = PostProcessStreamingMessage(update, currentToolName);
                if (postProcessMessage != null)
                {
                    yield return postProcessMessage;
                }
            }
            else
            {
                if (this.strictMode)
                {
                    throw new InvalidOperationException($"Invalid streaming message type {reply.GetType().Name}");
                }
                else
                {
                    yield return reply;
                }
            }
        }
    }

    public IMessage PostProcessMessage(IMessage message)
    {
        return message switch
        {
            IMessage<ChatResponseMessage> m => PostProcessChatResponseMessage(m.Content, m.From),
            IMessage<ChatCompletions> m => PostProcessChatCompletions(m),
            _ when strictMode is false => message,
            _ => throw new InvalidOperationException($"Invalid return message type {message.GetType().Name}"),
        };

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Send only supported streaming update message types

Example fix

Return TextMessageUpdate or ToolCallMessageUpdate from the streaming pipeline

When it happens

Trigger: Thrown at dotnet/src/AutoGen.AzureAIInference/Middleware/AzureAIInferenceChatRequestMessageConnector.cs:81 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/autogen@027ecf0a37 (2026-08-15). Data as JSON: /api/errors/fdf3a99b60e7cadd. Report an issue: GitHub.