The best way to learn to build an agent is to learn and use pi.dev . The homepage is a masterclass of explaining the main loop with 4 tools (read write edit bash) and how they enable any flow. Skills and Agents.md on how the agent can be guided.
If you understand the above, you're 80% of the way to building any purpose agent. System prompt, project prompt, and the tool call loop.
If you understand the above, you're 80% of the way to building any purpose agent. System prompt, project prompt, and the tool call loop.