microsoft/autogen · error · ArgumentException

ToolCallMessage is not supported when message.From is not th

Error message

ToolCallMessage is not supported when message.From is not the same with agent

What it means

Error "ToolCallMessage is not supported when message.From is not the same with agent" thrown in microsoft/autogen.

Source

Thrown at dotnet/src/AutoGen.AzureAIInference/Middleware/AzureAIInferenceChatRequestMessageConnector.cs:261

            ImageMessage image => this.CreateChatMessageImageContentItemFromImageMessage(image),
            _ => throw new NotImplementedException(),
        });

        return [new ChatRequestUserMessage(items)];
    }

    private ChatMessageImageContentItem CreateChatMessageImageContentItemFromImageMessage(ImageMessage message)
    {
        return message.Data is null && message.Url is not null
            ? new ChatMessageImageContentItem(new Uri(message.Url))
            : new ChatMessageImageContentItem(message.Data, message.Data?.MediaType);
    }

    private IEnumerable<ChatRequestMessage> ProcessToolCallMessage(IAgent agent, ToolCallMessage message)
    {
        if (message.From is not null && message.From != agent.Name)
        {
            throw new ArgumentException("ToolCallMessage is not supported when message.From is not the same with agent");
        }

        var toolCall = message.ToolCalls.Select((tc, i) => new ChatCompletionsFunctionToolCall(tc.ToolCallId ?? $"{tc.FunctionName}_{i}", tc.FunctionName, tc.FunctionArguments));
        var textContent = message.GetContent() ?? string.Empty;
        var chatRequestMessage = new ChatRequestAssistantMessage() { Content = textContent };
        foreach (var tc in toolCall)
        {
            chatRequestMessage.ToolCalls.Add(tc);
        }

        return [chatRequestMessage];
    }

    private IEnumerable<ChatRequestMessage> ProcessToolCallResultMessage(ToolCallResultMessage message)
    {
        return message.ToolCalls
            .Where(tc => tc.Result is not null)
            .Select((tc, i) => new ChatRequestToolMessage(tc.Result, tc.ToolCallId ?? $"{tc.FunctionName}_{i}"));

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Tool calls must originate from this agent's own replies

Example fix

Filter out foreign ToolCallMessages or convert them to text

When it happens

Trigger: Thrown at dotnet/src/AutoGen.AzureAIInference/Middleware/AzureAIInferenceChatRequestMessageConnector.cs:261 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/9f620471a9cb0ecd. Report an issue: GitHub.