AgentKit is a full-stack framework for building constrained, reliable LLM agents, developed by BCG X and now deprecated. The codebase consists of a FastAPI backend (Python 3.10) that orchestrates LangChain-based agents through a meta-agent and a simple router, executing tools like SQL queries, PDF question-answering, visualizations, image generation, and summarization. The Next.js 14 frontend provides a conversational chat interface with streaming responses, tool action rendering, and configurable UI components. The application is Dockerized with PostgreSQL, Redis, Minio, and Caddy, and supports optional features such as user authentication (NextAuth), feedback collection (LangSmith), and Celery-based background tasks. The architecture is monolithic in code but service-oriented in deployment, with configuration-driven agent behavior via YAML files. While the codebase demonstrates solid engineering patterns (e.g., streaming callbacks, base tool classes, state management), it is explicitly deprecated, relies on outdated LangChain imports and API versions, and requires significant maintenance to be viable for new projects. The repository serves as a reference for building constrained agents but is not recommended for production use without substantial updates.