Veriproof.Sdk.Instrumentation.SemanticKernel

Automatically captures spans for every Semantic Kernel function invocation, prompt render, and tool call using the Kernel’s built-in filter pipeline. No manual Activity creation required.

Compatibility: .NET 10+, Semantic Kernel 1.x

Installation


dotnet add package Veriproof.Sdk.Core
dotnet add package Veriproof.Sdk.Instrumentation.SemanticKernel

Setup


using OpenTelemetry.Trace;
using Veriproof.Sdk;
using Veriproof.Sdk.Instrumentation.SemanticKernel;
using Microsoft.SemanticKernel;
 
var builder = WebApplication.CreateBuilder(args);
 
// 1. Register the VeriProof Semantic Kernel filter
builder.Services.AddVeriproofSemanticKernelInstrumentation(options =>
{
    options.GenAiSystem           = "semantic-kernel";
    options.CaptureRenderedPrompt = false;  // opt-in: forward prompt text to VeriProof
    options.CaptureFunctionResult = false;  // opt-in: forward function output
    options.CaptureToolDescription = true;
});
 
// 2. Configure VeriProof OTel exporter
builder.Services.AddOpenTelemetry()
    .WithTraces(traces => traces
        .AddSource("*")
        .AddVeriproofTracing(options =>
        {
            options.ApiKey        = builder.Configuration["VeriproofApiKey"]!;
            options.ApplicationId = builder.Configuration["VeriproofApplicationId"]!;
        })
    );
 
// 3. Build the Semantic Kernel with VeriProof filter injected automatically via DI
builder.Services.AddKernel();
builder.Services.AddSingleton<IChatCompletionService>(...);

Alternatively, register the filter directly on a Kernel instance:


var kernel = Kernel.CreateBuilder()
    .AddOpenAIChatCompletion("gpt-4.1", apiKey: Environment.GetEnvironmentVariable("OPENAI_API_KEY")!)
    .Build();
 
kernel.FunctionInvocationFilters.Add(new VeriproofKernelFilter(
    new SemanticKernelAdapterOptions
    {
        GenAiSystem            = "semantic-kernel",
        CaptureRenderedPrompt  = false,
        CaptureFunctionResult  = false,
    }
));

`SemanticKernelAdapterOptions`

Option	Type	Default	Description
`TenantId`	`string?`	null	Override per-filter tenant if multi-tenant
`ApplicationId`	`string?`	null	Override per-filter application ID
`GenAiSystem`	`string`	`"semantic-kernel"`	`gen_ai.system` attribute on all spans
`CaptureRenderedPrompt`	`bool`	`false`	Include `gen_ai.system_instructions` / input messages (requires `EnableContentCapture` in exporter options)
`CaptureFunctionResult`	`bool`	`false`	Include `gen_ai.output.messages`
`CaptureToolDescription`	`bool`	`true`	Include tool `description` in span attributes
`MaxContentLength`	`int`	`2048`	Truncation limit for captured content

What gets captured

For each Semantic Kernel function invocation, VeriproofKernelFilter creates a child span containing:

Attribute	Source
`gen_ai.system`	`SemanticKernelAdapterOptions.GenAiSystem`
`gen_ai.operation.name`	Kernel operation type (e.g. `chat.completions`)
`gen_ai.request.model`	Model ID from the execution settings
`gen_ai.usage.input_tokens`	From the `FunctionResult` metadata
`gen_ai.usage.output_tokens`	From the `FunctionResult` metadata
`gen_ai.tool.name`	Function plugin + function name
`gen_ai.tool.description`	When `CaptureToolDescription = true`
`gen_ai.system_instructions`	When `CaptureRenderedPrompt = true`

Adding governance attributes

The filter creates spans automatically, but you can enrich them with additional governance metadata by accessing the Activity directly:


using System.Diagnostics;
using Veriproof.Sdk.Annotations;
using Veriproof.Sdk.Annotations.Models;
 
// In your kernel invocation wrapper:
using var sessionActivity = activitySource.StartActivity("ai.session");
sessionActivity?
    .SetSessionIntent(SessionIntent.advisory)
    .SetTransactionId($"support:{ticketId}")
    .SetDataSensitivity(DataSensitivity.Internal);
 
// Invoke the kernel — all SK spans appear as children of sessionActivity
var result = await kernel.InvokeAsync(plugin["AnalyseTicket"], new KernelArguments
{
    ["ticket"] = ticketBody
});
 
sessionActivity?
    .SetSessionOutcome(SessionOutcome.success)
    .SetGovernanceDecision(
        DecisionContext.Simple("Categorise support ticket", result.GetValue<string>()!));

Full example

See the Semantic Kernel example for a complete runnable application.

Next steps

AutoGen instrumentation — multi-agent workflow tracing
Veriproof.Sdk.Annotations reference — Activity extension methods and governance models
Veriproof.Sdk.Core reference — exporter setup and VeriproofExporterOptions