How to build an AI Agent

wojciech achtelik
Wojciech Achtelik
AI Engineer Lead
June 19, 2025

How to build an AI Agent involves a systematic development process that combines machine learning frameworks, natural language processing capabilities, and autonomous decision-making architectures to create intelligent systems capable of independent task execution. The process begins with defining the agent’s scope, objectives, and operational parameters, followed by selecting appropriate foundation models such as GPT, Claude, or open-source alternatives. Developers must implement core components including perception modules for data input processing, reasoning engines for decision logic, memory systems for context retention, and action execution frameworks for interacting with external systems. Essential technical steps include designing prompt engineering strategies, integrating API connections for external data sources, implementing safety guardrails and error handling mechanisms, and establishing feedback loops for continuous learning. The development workflow requires setting up vector databases for knowledge retrieval, configuring authentication systems for secure access, and implementing monitoring tools for performance tracking. Testing phases involve validating the agent’s responses across various scenarios, ensuring reliability under edge cases, and optimizing performance metrics before deployment in production environments.