Repolode
Submit
BoundaryML

BoundaryML/baml

BAML is a programming language for building AI agents, with typed functions, a Rust-based compiler, and callable from TypeScript, Python, Go and other languages.

View on GitHubWebsite
Stars
9,492
Forks
514
Open issues
366
Last commit
6 hours ago

What is it?

BAML is a programming language aimed at building agents. Its syntax resembles TypeScript, and it adds a type system that persists at runtime, typed and statically analyzed errors, and a filesystem-based module layout. The goal is to reduce the mistakes that agents make when producing or handling structured data.

The language includes a built-in test and evaluation framework, a standard library for agent tasks, and green-thread style concurrency. The compiler is written in Rust. BAML can run standalone, or be adopted incrementally by calling BAML functions from existing TypeScript, Python, Go, C#, Java and other codebases.

The project provides a CLI with commands for installing the agent tooling, initializing a project, and installing an IDE extension, with installation available via Homebrew.

Key features

  • 01Typed functions and errors that are checked statically
  • 02Types preserved at runtime, with no need for casting to any
  • 03Built-in test and evaluation framework
  • 04Standard library for agent tasks
  • 05Callable from TypeScript, Python, Go, C#, Java and other languages

Use cases

  • Defining structured LLM outputs with typed schemas
  • Adding BAML functions to an existing TypeScript or Python codebase
  • Writing and running evals for agent behavior
  • Building new agent applications in a dedicated language

Quick start

  1. 1

    Install BAML with Homebrew

    brew install baml
  2. 2

    Install the agent integration

    baml agent install
  3. 3

    Initialize a new BAML project

    baml init
  4. 4

    Install the IDE extension for VS Code

    baml ide install --code

Things to know

  • The README does not document a Windows install path, so platform support is unclear from it.
  • Setup is a multi-step CLI flow, and the README points to an external quickstart for details.

In collections

Open-source AI agent frameworks & appsCompilers, transpilers & programming languages

Topics

#llm#agents#programming-language#structured-output#type-system#evals#rust#boundaryml#guardrails#structured-data

FAQ

What is baml?
BAML is a programming language for building AI agents, with typed functions, a Rust-based compiler, and callable from TypeScript, Python, Go and other languages. BAML is a programming language aimed at building agents. Its syntax resembles TypeScript, and it adds a type system that persists at runtime, typed and statically analyzed errors, and a filesystem-based module layout. The goal is to reduce the mistakes that agents make when producing or handling structured data.
Is baml free to use? What license does it have?
baml is open source under the Apache-2.0 license. Check the license terms before using it in commercial products.
Is baml still maintained?
Actively maintained. The last commit to baml was on Nov 7, 2026.
What can I use baml for?
Defining structured LLM outputs with typed schemas Adding BAML functions to an existing TypeScript or Python codebase Writing and running evals for agent behavior Building new agent applications in a dedicated language
How do I install baml?
Install BAML with Homebrew: brew install baml Install the agent integration: baml agent install Initialize a new BAML project: baml init Install the IDE extension for VS Code: baml ide install --code
Where can I get baml?
The source code and installation instructions are on GitHub: https://github.com/BoundaryML/baml

Summary generated by AI from the project's README. GitHub stats refresh daily.

Related projects