Build AI AgentsFrom first prompt to production agent

An AI agent is a model running in a loop: it reads a goal, decides which tool to call, observes the result and repeats until the job is done. These guides cover every way to build one in 2026, from code-first SDKs (Claude Agent SDK, OpenAI Agents SDK, LangGraph, CrewAI, Google ADK) to no-code builders (n8n, Zapier, Copilot Studio), plus the parts that decide whether an agent survives production: tools, memory, RAG, human approval, evals, security and monitoring.