microsoft/autogen · error · InvalidOperationException

Invalid ChatResponseMessage

Error message

Invalid ChatResponseMessage

What it means

Error "Invalid ChatResponseMessage" thrown in microsoft/autogen.

Source

Thrown at dotnet/src/AutoGen.AzureAIInference/Middleware/AzureAIInferenceChatRequestMessageConnector.cs:160

        {
            var functionToolCalls = chatResponseMessage.ToolCalls
                .Where(tc => tc is ChatCompletionsFunctionToolCall)
                .Select(tc => (ChatCompletionsFunctionToolCall)tc);

            var toolCalls = functionToolCalls.Select(tc => new ToolCall(tc.Name, tc.Arguments) { ToolCallId = tc.Id });

            return new ToolCallMessage(toolCalls, from)
            {
                Content = textContent,
            };
        }

        if (textContent is string content && !string.IsNullOrEmpty(content))
        {
            return new TextMessage(Role.Assistant, content, from);
        }

        throw new InvalidOperationException("Invalid ChatResponseMessage");
    }

    public IEnumerable<IMessage> ProcessIncomingMessages(IAgent agent, IEnumerable<IMessage> messages)
    {
        return messages.SelectMany<IMessage, IMessage>(m =>
        {
            if (m is IMessage<ChatRequestMessage> crm)
            {
                return [crm];
            }
            else
            {
                var chatRequestMessages = m switch
                {
                    TextMessage textMessage => ProcessTextMessage(agent, textMessage),
                    ImageMessage imageMessage when (imageMessage.From is null || imageMessage.From != agent.Name) => ProcessImageMessage(agent, imageMessage),
                    MultiModalMessage multiModalMessage when (multiModalMessage.From is null || multiModalMessage.From != agent.Name) => ProcessMultiModalMessage(agent, multiModalMessage),
                    ToolCallMessage toolCallMessage when (toolCallMessage.From is null || toolCallMessage.From == agent.Name) => ProcessToolCallMessage(agent, toolCallMessage),

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Check the model returned a valid choice with content

Example fix

Guard against empty Choices and null Content before converting

When it happens

Trigger: Thrown at dotnet/src/AutoGen.AzureAIInference/Middleware/AzureAIInferenceChatRequestMessageConnector.cs:160 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/95d9e2c7ae68b585. Report an issue: GitHub.