How to add an additional property to KernelContent and have it sent to the LLM

[davidames]

I'm using Claude on AWS Bedrock on SK via M.E.AI.

Claude on AWS Bedrock supports Chat with File, but the document name needs to be sent in chat message content too.

I've tried a few different ways to add this property, but it's never sent.

Here was my latest attempt:

var imagePath = Path.Combine("test-data", "openai-edu-ai-ready-workforce.pdf");
var imageData = await File.ReadAllBytesAsync(imagePath);

var contentItems = new ChatMessageContentItemCollection();
var metaData = new Dictionary<string, object?>()
        {
            { "name", "myFile.pdf" }
        };
        
var binaryContent = new BinaryContent(imageData, "application/pdf")
        {
Metadata = metaData
        };
      
 contentItems.Add(binaryContent);
contentItems.Add(new TextContent("Describe this document"));

which results in this request:

which results in this response:
{"message":"1 validation error detected: Value at 'messages.1.member.content.1.member.document.name' failed to satisfy constraint: Member must not be null"}

Is there a way to add custom properties to the request payload? I've also tried sub-classing BinaryContent but had the same result.

[moonbox3]

Hi @davidames, you said you're using MEAI, correct? As part of ChatOptions there are both:

• RawRepresentationFactory
• AdditionalProperties

Have you tried using any of these to provide customer properties as part of the request?

https://github.com/dotnet/extensions/blob/0204116f1aecc9308691d8a3bb6342d70a787e19/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatOptions.cs#L136