# ExtensionPointDiagnostic

> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/http-api/schemas/extensionpointdiagnostic/
> Summary: OpenAPI request or response schema for ExtensionPointDiagnostic, including required fields, defaults, constraints, and linked nested types.

[← All HTTP schemas](/http-api/schemas/)

One host-bound extension point and whether the host replaced its built-in default.

**Shape:** `object`

| Property | Required | Type | Description | Rules |
|---|---|---|---|---|
| `contract` | yes | `string` | Gets the contract's name, for example `ITenantContext`. | — |
| `implementation` | yes | `string` | Gets the registered implementation's type name. | — |
| `isBuiltInDefault` | yes | `boolean` | Gets whether the registration is Tracon's built-in default. | — |