Zettelkasten AI Assistant is an AI-powered Zettelkasten knowledge management system designed to capture, refine, and connect atomic ideas. Built with modern Python, it stores notes as Markdown files with YAML frontmatter and maintains a SQLite index for fast full-text search. Notes are atomic (one concept per note) and uniquely identified, with bi-directional links forming a knowledge graph. The system offers AI-assisted workflows to Capture, Explain, Question, Refine, and Connect, including auto-summarization and metadata suggestions to surface meaningful insights and relationships. Storage is future-proof by design, while AI features help reduce cognitive load and accelerate learning. It exposes multiple interfaces—CLI, REST API, Streamlit UI—and an MCP Server that lets external AI assistants and agents access and manipulate notes via a defined toolset (create, search, CEQRC execution, links, and summaries). OpenAI is supported (with a stub option for testing), and complete documentation guides integration and testing.