Haystack

Explore Haystack, the AI-powered editor that transforms pull requests into visual, structured, and efficient review experiences for developers.

Haystack is an open-source AI framework designed for building production-ready, LLM-powered agents and applications. It provides a modular, composable architecture that orchestrates AI workflows from retrieval to reasoning, memory, and tool use. Haystack offers full visibility into AI decisions, enabling transparent context engineering. The framework integrates with major AI providers (OpenAI, Anthropic, Mistral, Hugging Face) and vector databases (Weaviate, Pinecone, Elasticsearch) without vendor lock-in. It supports advanced RAG with hybrid retrieval and self-correction loops, AI agents with standardized tool calling, multimodal AI (image processing, audio transcription), conversational AI, and content generation using Jinja2 templates. Haystack pipelines are serializable, cloud-agnostic, and Kubernetes-ready, with built-in reliability and observability for enterprise-scale deployment.