Class FilterPipeline

Namespace

LMKit.TextGeneration.Filters

Assembly

LM-Kit.NET.dll

An ordered collection of filters that intercept prompt, completion, and tool invocation stages.

public sealed class FilterPipeline

Inheritance

object

FilterPipeline

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Extension Methods

FilterPipelineExtensions.AddCompletionFilter(FilterPipeline, Func<CompletionFilterContext, Func<CompletionFilterContext, Task>, Task>)

FilterPipelineExtensions.AddPromptFilter(FilterPipeline, Func<PromptFilterContext, Func<PromptFilterContext, Task>, Task>)

FilterPipelineExtensions.AddToolInvocationFilter(FilterPipeline, Func<ToolInvocationFilterContext, Func<ToolInvocationFilterContext, Task>, Task>)

Examples

Configuring a pipeline with multiple filters:

using LMKit.TextGeneration;
using LMKit.TextGeneration.Filters;
var pipeline = new FilterPipeline();
// Add class-based filters
pipeline.PromptFilters.Add(new LoggingPromptFilter());
pipeline.CompletionFilters.Add(new TokenTelemetryFilter());
pipeline.ToolInvocationFilters.Add(new ToolLoggingFilter());
// Add inline lambda filters
pipeline.AddPromptFilter(async (ctx, next) =>
{
Console.WriteLine($"Prompt: {ctx.Prompt}");
await next(ctx);
});
// Assign to a conversation
var chat = new MultiTurnConversation(model);
chat.Filters = pipeline;

Using with AgentBuilder:

using LMKit.Agents;
using LMKit.TextGeneration.Filters;
var agent = new AgentBuilder()
.WithModel(model)
.WithPersona("Assistant")
.WithFilters(filters =>
{
filters.PromptFilters.Add(new ModerationFilter());
filters.CompletionFilters.Add(new QualityGateFilter());
filters.AddToolInvocationFilter(async (ctx, next) =>
{
Console.WriteLine($"Tool: {ctx.ToolCall.Name}");
await next(ctx);
});
})
.Build();

Remarks

Filters execute in a middleware (onion) pattern: each filter wraps the next one. Code before await next(context) runs on the way in; code after runs on the way out. The execution order is determined by the order filters are added to the lists.

Assign a FilterPipeline to Filters for direct conversation usage, or configure it via AgentBuilder.WithFilters() for agent-based workflows.

Execution model with two prompt filters:

Prompt Filter 1 (before)
  Prompt Filter 2 (before)
    [inference]
  Prompt Filter 2 (after)
Prompt Filter 1 (after)

Properties

CompletionFilters

Gets the ordered list of completion filters.

PromptFilters

Gets the ordered list of prompt filters.

ToolInvocationFilters

Gets the ordered list of tool invocation filters.