Output is a TypeScript framework for building AI workflows and agents. It provides integrated support for prompts, evals, tracing, cost tracking, and orchestration in a single cohesive system. The framework is explicitly designed for AI coding assistants like Claude Code, allowing developers to describe what they want and have an AI agent build it following best practices. It emphasizes avoiding SaaS fragmentation and vendor lock-in by keeping all functionality within the developer’s codebase.