ax-llm/ax

Implements DSPy's declarative programming model through type-safe TypeScript signatures that automatically generate optimized prompts and handle validation—eliminating manual prompt engineering. Supports 15+ LLM providers with zero rewrites, nested structured outputs with full type inference, and includes built-in optimization algorithms (MiPRO, ACE, GEPA), agents with ReAct pattern tools, and RLM mode for handling long-context analysis through recursive sub-queries in persistent JavaScript runtimes.

2,465 stars and 151,495 monthly downloads. Actively maintained with 83 commits in the last 30 days. Available on npm.