WrenAI/docs/core

Wren Engine Documentation

Wren Engine is an open-source semantic engine for AI agents and MCP clients. It translates SQL queries through MDL (Model Definition Language) and executes them against 22+ data sources.

Getting Started

• Quick Start -- Set up a local semantic layer with the jaffle_shop dataset using the Wren CLI and Claude Code. (~15 minutes)

Core Concepts

• Wren Project -- Project structure, YAML authoring, and how the CLI compiles models into a deployable manifest.

MDL Reference

• Model -- Define semantic entities over physical tables or SQL expressions.
• Relationship -- Declare join paths between models for automatic resolution.
• View -- Named SQL queries that behave as virtual tables.