For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
  • Getting Started
    • Welcome
    • Contributing
  • Concepts
    • Columns
    • Seed Datasets
    • Agent Rollout Ingestion
    • Custom Columns
    • Validators
    • Processors
    • Person Sampling
    • Traces
    • Architecture & Performance
    • Deployment Options
    • Security
  • Tutorials
    • Overview
    • The Basics
    • Structured Outputs, Jinja Expressions, and Conditional Generation
    • Seeding with an External Dataset
    • Providing Images as Context
    • Generating Images
    • Image-to-Image Editing
  • Recipes
    • Recipe Cards
  • Plugins
    • Overview
    • Example Plugin
    • FileSystemSeedReader Plugins
    • Discover
  • Code Reference
    • Overview
      • Overview
      • seed_readers
      • processors
      • mcp
      • column_generators
      • Seed Reader API
      • Processor API
      • MCP Runtime API
      • Column Generator API
  • Dev Notes
    • Overview
    • Prompt Sensitivity
    • Retriever SDG Toolkit
    • Have It Your Way
    • VLM Long Document Understanding
    • Push Datasets to Hugging Face Hub
    • Text-to-SQL for Nemotron Super
    • Async All the Way Down
    • Owning the Model Stack
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Code ReferenceEngine Extension API

Engine MCP

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Execution-time MCP registries, facades, session handling, schema discovery, and tool calls.

For user-facing provider and tool config objects, see MCP configuration.

Model layerMCP layerPurpose
ModelProviderRegistryMCPProviderRegistryHolds provider configurations.
ModelRegistryMCPRegistryManages configs by alias and lazily creates facades.
ModelFacadeMCPFacadeProvides a lightweight runtime facade scoped to one config.
ModelConfig.aliasToolConfig.tool_aliasAlias referenced by column configs.
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Column Generators