Langchain

LangChain is an engineering platform and open-source framework designed to help developers build, test, and deploy production-grade AI agents and applications. It focuses on orchestrating large language models (LLMs) with external tools, data sources, and workflows so that AI systems can reason, take actions, and interact with real-world environments reliably. The platform abstracts common patterns in LLM application development, enabling teams to move from prototype to production with consistent architectures and observability.

Core capabilities include composable primitives for prompts, models, memory, and tools, allowing developers to chain together complex reasoning steps and multi-tool workflows. LangChain supports integration with vector databases, SQL databases, APIs, and file systems, making it straightforward to build retrieval-augmented generation (RAG) systems and data-aware agents. The platform also includes LangSmith for evaluation, tracing, and debugging, giving teams insight into model behavior, latency, and failure modes. Built-in testing, evaluation harnesses, and guardrails help improve reliability, reduce hallucinations, and enforce constraints on agent behavior.