# ITraconBuilder > 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/api/tracon.itraconbuilder/ > Summary: ITraconBuilder: The fluent chain that configures Tracon. Returned from the AddTracon call.

Namespace Tracon · Assembly Tracon.Core.dll

The fluent chain that configures Tracon. Returned from the `AddTracon` call. ```csharp public interface ITraconBuilder ```

Extension Methods: TraconBuilderExtensions.AddAgent(ITraconBuilder, AgentDefinition), TraconBuilderExtensions.AddAgent(ITraconBuilder, string, Func<IServiceProvider, AIAgent>, string?), TraconBuilderExtensions.AddAgentDecorator<TDecorator>(ITraconBuilder), TraconBuilderExtensions.AddAgentDecorator(ITraconBuilder, IAgentDecorator), TraconBuilderExtensions.AddAgentDecorator(ITraconBuilder, Func<IServiceProvider, IAgentDecorator>), TraconBuilderExtensions.AddAgentExtension<TExtension>(ITraconBuilder), TraconBuilderExtensions.AddAgentExtension(ITraconBuilder, IAgentExtension), TraconBuilderExtensions.AddAgentExtension(ITraconBuilder, string, Action<AgentExtensionContext>, string?), TraconBuilderExtensions.AddAgentSource<TSource>(ITraconBuilder), TraconBuilderExtensions.AddAgentSource(ITraconBuilder, IAgentSource), TraconBuilderExtensions.AddAgentSource(ITraconBuilder, Func<IServiceProvider, IAgentSource>), TraconClientToolExtensions.AddClientTool(ITraconBuilder, string, string, JsonElement), TraconContentGuardBuilderExtensions.AddContentGuard<TGuard>(ITraconBuilder), TraconContentGuardBuilderExtensions.AddContentGuard(ITraconBuilder, IContentGuard), TraconContentGuardBuilderExtensions.AddContentGuard(ITraconBuilder, Func<IServiceProvider, IContentGuard>), TraconContentProtectionExtensions.AddContentProtection(ITraconBuilder, Action<TraconContentProtectionOptions>?), TraconContentProtectionExtensions.AddContentProtection<TProtector>(ITraconBuilder), TraconBuilderExtensions.AddEvalCheck(ITraconBuilder, string, EvalCheck), TraconOnlineEvaluationBuilderExtensions.AddEvalEvaluatorFactory<TFactory>(ITraconBuilder), TraconOnlineEvaluationBuilderExtensions.AddEvalEvaluatorFactory(ITraconBuilder, IEvalEvaluatorFactory), TraconOnlineEvaluationBuilderExtensions.AddEvaluatorJudge(ITraconBuilder, string, IEvaluator), TraconOnlineEvaluationBuilderExtensions.AddEvaluatorJudge(ITraconBuilder, string, IEvaluator, Action<ModelRunJudgeOptions>), TraconBuilderExtensions.AddHostedTool(ITraconBuilder, string, HostedToolKind, Func<HostedToolContext, AITool>, string?), TraconBuilderExtensions.AddLoopEvaluator(ITraconBuilder, string, LoopEvaluator), TraconBuilderExtensions.AddLoopEvaluator(ITraconBuilder, string, LoopEvaluator, string?), TraconBuilderExtensions.AddLoopEvaluator(ITraconBuilder, string, Func<IServiceProvider, LoopEvaluator>), TraconBuilderExtensions.AddLoopEvaluator(ITraconBuilder, string, Func<IServiceProvider, LoopEvaluator>, string?), TraconBuilderExtensions.AddModelProvider<TProvider>(ITraconBuilder), TraconBuilderExtensions.AddModelProvider(ITraconBuilder, IModelProvider), TraconBuilderExtensions.AddModelProvider(ITraconBuilder, Func<IServiceProvider, IModelProvider>), TraconOnlineEvaluationBuilderExtensions.AddModelRunJudge(ITraconBuilder, Action<ModelRunJudgeOptions>), TraconContentGuardBuilderExtensions.AddPatternContentGuard(ITraconBuilder, Action<PatternContentGuardOptions>?), TraconBuilderExtensions.AddRunJudge<TJudge>(ITraconBuilder), TraconBuilderExtensions.AddRunJudge(ITraconBuilder, IRunJudge), TraconBuilderExtensions.AddRunJudge(ITraconBuilder, Func<IServiceProvider, IRunJudge>), TraconBuilderExtensions.AddScopedTool(ITraconBuilder, AIFunction, Action<ToolRegistrationOptions>), TraconBuilderExtensions.AddScopedTool(ITraconBuilder, AIFunction), TraconBuilderExtensions.AddSkill(ITraconBuilder, AgentSkillDefinition), TraconBuilderExtensions.AddSpeechSynthesizer(ITraconBuilder, string, Func<IServiceProvider, ISpeechSynthesizer>), TraconBuilderExtensions.AddSpeechSynthesizer(ITraconBuilder, string, TextToSpeechClientBinding), TraconBuilderExtensions.AddSpeechTranscriber(ITraconBuilder, string, Func<IServiceProvider, ISpeechTranscriber>), TraconBuilderExtensions.AddSpeechTranscriber(ITraconBuilder, string, SpeechToTextClientBinding), TraconBuilderExtensions.AddTool(ITraconBuilder, AIFunction, Action<ToolRegistrationOptions>), TraconBuilderExtensions.AddTool(ITraconBuilder, AIFunction), TraconBuilderExtensions.AddTool(ITraconBuilder, Delegate, string?, string?, Action<ToolRegistrationOptions>?), TraconToolApprovalPolicyExtensions.AddToolApprovalPolicy(ITraconBuilder, string, Func<ToolApprovalContext, ToolApprovalPolicyDecision>), TraconBuilderExtensions.AddToolsFrom<T>(ITraconBuilder), TraconBuilderExtensions.AddToolsFrom(ITraconBuilder, Type), TraconBuilderExtensions.Configure(ITraconBuilder, Action<TraconOptions>), TraconBuilderExtensions.RequireCustomBinding<T>(ITraconBuilder), TraconBuilderExtensions.RequireProductionProfile(ITraconBuilder, Action<TraconProductionProfileOptions>?), TraconBuilderConversationMemoryExtensions.UseConversationMemory(ITraconBuilder, Action<TraconConversationMemoryOptions>), LiveVoiceBuilderExtensions.UseLiveVoice(ITraconBuilder, IConfiguration), LiveVoiceBuilderExtensions.UseLiveVoice(ITraconBuilder), LiveVoiceBuilderExtensions.UseLiveVoice(ITraconBuilder, Action<VoiceLiveOptions>), TraconSkillScriptBuilderExtensions.UseSkillScripts(ITraconBuilder, Action<TraconSkillScriptOptions>), VoiceConversationBuilderExtensions.UseVoiceConversation(ITraconBuilder, IConfiguration), VoiceConversationBuilderExtensions.UseVoiceConversation(ITraconBuilder), VoiceConversationBuilderExtensions.UseVoiceConversation(ITraconBuilder, Action<VoiceConversationOptions>)

## Remarks The chain carries only [ITraconBuilder.Services](/api/tracon.itraconbuilder/#Tracon_ITraconBuilder_Services). Every registration capability is an extension method: Tracon's own live in [TraconBuilderExtensions](/api/tracon.traconbuilderextensions/), and provider and storage packages add theirs (`UsePostgreSql`, `UseOpenAI`, and so on). `AddTracon` returns Tracon's implementation, and this interface is for calling, not for implementing in an application. The one other implementation it is meant for is a test double: a chain of your own only has to supply [ITraconBuilder.Services](/api/tracon.itraconbuilder/#Tracon_ITraconBuilder_Services), and the extension methods run the same way against it. ## Properties ### Services The underlying service collection. ```csharp IServiceCollection Services { get; } ``` #### Property Value [IServiceCollection](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection) #### Remarks The escape hatch: anything Tracon does not model is registered here. Every Tracon service is registered with `TryAdd`, so registration ORDER decides who wins, and the two seam shapes behave differently. For a single-instance seam (for example [ITenantContext](/api/tracon.itenantcontext/)): a registration made before `AddTracon` wins outright, and only one registration remains. A registration made after `AddTracon` also wins for a direct resolve, but Tracon's own registration is not removed - it stays behind as a second, unused entry. For a multi-registration seam (for example [IAgentDecorator](/api/tracon.iagentdecorator/)): a registration made before `AddTracon` joins the list alongside the built-in ones. A registration made after `AddTracon` also joins the list - the built-in implementation keeps running too, which is a real behavior difference from the single-instance case above. ```csharp // Runs before AddTracon(), so this registration wins outright. builder.Services.AddSingleton(new OrderGateway()); builder.AddTracon(); ```