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Default Orchestrator

The built-in CrestApps.Core orchestration engine that connects the framework's AI clients, tools, retrieval pipelines, response handlers, and streaming loop into one end-to-end execution model.

What it is​

DefaultOrchestrator is the framework's first-party IOrchestrator implementation. It is the standard orchestrator used when you call AddCoreAIOrchestration() and do not select an alternative such as Copilot or Claude.

It is responsible for:

  • loading the active AI client and deployment
  • building orchestration context from profiles, templates, MCP, data sources, documents, and memory
  • scoping tools progressively so large tool catalogs stay usable
  • running preemptive RAG before the main completion call
  • streaming model output and routing references back to the caller

When to use it​

Use the default orchestrator when you want the full CrestApps.Core pipeline instead of a provider-specific orchestrator runtime.

That is usually the right choice when you need:

  • the shared tool and agent pipeline
  • preemptive RAG across documents, memory, and data sources
  • MCP integration through the framework's own orchestration flow
  • predictable host-controlled deployment and connection resolution

Registration​

builder.Services
    .AddCoreAIServices()
    .AddCoreAIOrchestration()
    .AddCoreAIOpenAI();