.NET - OpenTelemetry - Application Insights - Truncated Input Message Traces

[mm-ggrazhdanski]

Hello, thank you for the great work on the Agent Framework!

Question

Is there a way to view the entire input messages collection sent to a chat completion agent in Application Insights - without it being truncated?

Context

In .NET, we have a chat client agent configured as follows:

var agentOptions = new ChatClientAgentOptions
{
    Name = "Agent1",
    ChatOptions = new()
    {
        Tools = [..],
        Temperature = 0,
    },
};

var agent = azureOpenAiClient
    .GetChatClient("deployment-name")
    .AsAIAgent(agentOptions)
    .AsBuilder()
    .UseOpenTelemetry("Agent1", o => o.EnableSensitiveData = true)
    .Build();

With an Azure Monitor trace provider configured.
The system prompt is part of the messages collection passed to agent.RunAsync.

When debugging unexpected agent behavior, message tracing is enabled, so the full conversation is captured. However, the gen_ai.input.messages field in the invoke_agent trace is usually truncated due to Application Insights’ message length limits - especially when our system prompt is long.

This makes debugging harder because the actual user message often gets cut off. Tool call traces usually help us infer what happened, and we do store the full chat history in our database.

Having a single, complete trace in the Azure portal would be very useful.
Is there any way to achieve complete, non‑truncated message tracing in Application Insights?

Thank you!