> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/datadesigner/llms.txt.
> For full documentation content, see https://docs.nvidia.com/nemo/datadesigner/llms-full.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/datadesigner/_mcp/server.

# Engine MCP

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

For user-facing provider and tool config objects, see [MCP configuration](/code-reference/config/mcp).

| Model layer             | MCP layer               | Purpose                                                     |
| ----------------------- | ----------------------- | ----------------------------------------------------------- |
| `ModelProviderRegistry` | `MCPProviderRegistry`   | Holds provider configurations.                              |
| `ModelRegistry`         | `MCPRegistry`           | Manages configs by alias and lazily creates facades.        |
| `ModelFacade`           | `MCPFacade`             | Provides a lightweight runtime facade scoped to one config. |
| `ModelConfig.alias`     | `ToolConfig.tool_alias` | Alias referenced by column configs.                         |