ax

Ax is a TypeScript-first implementation of the DSPy programming model for building structured LLM applications, published as `@ax-llm/ax` on npm and cross-compiled into verified Python, Java, C++, Go, and Rust library shapes from a single source. Developers define typed signatures using a string DSL, a fluent `f()` builder, or Standard Schema validators like Zod or Valibot, then call `.forward()` to get structured outputs without manual prompt engineering. The library connects to Anthropic (Claude), OpenAI, Google Gemini, Mistral, DeepSeek, Cohere, Grok, and other providers through a unified provider abstraction, making it straightforward to swap Claude in or out by changing a single `name` field. Beyond generation, Ax includes agents with memory and delegation, typed program graphs called Flows with branching and parallel execution, and GEPA-based optimizers for few-shot bootstrapping. Streaming is enabled by default, allowing field parsing and early cancellation before a full response completes, keeping overhead close to raw provider SDK latency. The framework targets TypeScript developers building multi-provider LLM pipelines who want DSPy-style optimization without Python.

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