LangFn (TypeScript)

Comprehensive AI Development SDK for LLM-based workflows.

Features

• Model Abstraction: Unified interface for OpenAI, Anthropic, Ollama, and more.
• Orchestration: Sequential, Parallel, and Map-Reduce chains.
• Graph Workflows: Stateful workflows with StateGraph.
• Agents: Functional ToolAgent and ReActAgent.
• Structured Output: Type-safe output parsing with Zod.
• RAG: Embeddings and Vector Store support.
• Observability: Built-in tracing.

Usage

import { langfn, models } from "langfn";

const lang = langfn({
  model: new models.OpenAIChatModel({
    apiKey: process.env.OPENAI_API_KEY
  })
});

const response = await lang.complete("Hello world");
console.log(response.content);

Documentation

See the main documentation for more details.