BoundaryML/baml
The AI framework that adds the engineering to prompt engineering (Python/TS/Ruby/Java/C#/Rust/Go compatible)
Uses a declarative schema-driven language compiled to Rust to define LLM functions with type-safe inputs/outputs, eliminating manual JSON schema management while supporting tool-calling across models without native API support via schema-aligned parsing. Generates strongly-typed client libraries for Python, TypeScript, Ruby, Java, C#, Go, and REST, enabling prompt definitions to remain separate from application code. Includes built-in IDE tooling, streaming support, retry/fallback strategies, and compatibility with OpenAI, Anthropic, Gemini, Bedrock, and 100+ other models.
7,751 stars. Actively maintained with 60 commits in the last 30 days.
Stars
7,751
Forks
395
Language
Rust
License
Apache-2.0
Category
Last pushed
Mar 13, 2026
Commits (30d)
60
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