Definite has developed an AI agent named Fi capable of deriving insights from large datasets and performing data engineering tasks efficiently and accurately, with a response time of just seconds. The system uses a combination of Pydantic, Pydantic AI, and Logfire to achieve its capabilities, allowing for model hot-swapping, query validation, error correction, and real-time thought process tracking. Pydantic AI is chosen for its speed, modularity, and strong documentation, while Logfire aids in performance benchmarking and optimization. Fi's design prioritizes minimizing latency and maximizing performance by selectively querying relevant data and employing schema filtering techniques. The system supports interactive and rich UI elements within the chat interface, enhancing user experience by integrating real-time updates and tool calls. Fi also incorporates introspection tools and agents to maintain a broad understanding of tasks, aiming to reduce errors and improve task execution. The AI agent demonstrates emergent behavior, suggesting potential for further sophistication as the industry evolves.