# PipelineConfigurationAnnotation

- Kind: `class`
- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Version: `13.3.0`
- Namespace: `Aspire.Hosting.Pipelines`
- Target framework: `net8.0`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/Pipelines/PipelineConfigurationAnnotation.cs)
- Implements: [IResourceAnnotation](/reference/api/csharp/aspire.hosting/iresourceannotation.md)

An annotation that registers a callback to execute during the pipeline configuration phase, allowing modification of step dependencies and relationships.

## Definition

```csharp
namespace Aspire.Hosting.Pipelines;

public class PipelineConfigurationAnnotation
    : Aspire.Hosting.ApplicationModel.IResourceAnnotation
{
    // ...
}
```

## Constructors

- [PipelineConfigurationAnnotation(Func<PipelineConfigurationContext, Task>)](/reference/api/csharp/aspire.hosting/pipelineconfigurationannotation/constructors.md#constructor-func-pipelineconfigurationcontext-task) -- Initializes a new instance of the [PipelineConfigurationAnnotation](/reference/api/csharp/aspire.hosting/pipelineconfigurationannotation.md) class.
- [PipelineConfigurationAnnotation(Action<PipelineConfigurationContext>)](/reference/api/csharp/aspire.hosting/pipelineconfigurationannotation/constructors.md#constructor-action-pipelineconfigurationcontext) -- Initializes a new instance of the [PipelineConfigurationAnnotation](/reference/api/csharp/aspire.hosting/pipelineconfigurationannotation.md) class.

## Properties

- [Callback](/reference/api/csharp/aspire.hosting/pipelineconfigurationannotation/properties.md#callback) : `Func<PipelineConfigurationContext, Task>` `get` -- Gets the callback function to execute during the configuration phase.