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BAML: The Engineering Framework for Prompt Engineering

BAML (Boundary AI Markup Language) is an open-source framework that brings structure, testability, and version control to prompt engineering, enabling seamless integration of AI models into production applications across multiple programming languages.

Rust
Added on 2025年7月4日
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Project Introduction

Summary

BAML is an AI framework designed to add engineering discipline to prompt engineering. It allows developers to define AI interactions with structured inputs/outputs, test them rigorously, and integrate them reliably into diverse programming languages, transforming prompt engineering from an art to an engineering practice.

Problem Solved

Developing reliable AI features often involves managing complex, untestable prompt strings and unstructured outputs, making versioning and integration into production codebases challenging. BAML solves this by providing a framework to define, test, and integrate AI interactions as structured components.

Core Features

Structured AI Calls (BAML Language)

Define AI calls and expected outputs using a structured, language-agnostic markup language, ensuring consistency and maintainability.

Multi-Language Compatibility

Integrate seamlessly into Python, TypeScript, Ruby, Java, C#, Rust, and Go codebases, treating AI calls like standard function calls.

Testing & Versioning

Write unit tests for your AI prompts and outputs directly within your development workflow, ensuring reliability as prompts and models evolve.

Tech Stack

TypeScript
Python
LLVM (potential)
Various Language Runtimes (e.g., V8, CPython, JVM)

Use Cases

BAML is ideal for any scenario where structured, testable, and language-agnostic integration of AI models into software applications is required.

Building Production-Ready AI Features

Details

Build features like natural language processing (NLP) components, content generation, data extraction, or classification within large-scale applications by treating AI calls as testable code modules.

User Value

Significantly reduces the complexity and risk of integrating AI, making features reliable and easier to maintain over time.

Ensuring Structured & Reliable AI Outputs

Details

Ensure that AI model outputs conform to expected data structures (e.g., JSON, specific objects) required by downstream application logic, regardless of the underlying model or programming language.

User Value

Eliminates brittle parsing logic and runtime errors caused by unexpected AI output formats.

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