Systems capable of making decisions and performing tasks autonomously.
I have three AI agents: one writes code, another knows the production database, and the third monitors container logs. I used to be a copy-paste pipeline between them. Now Coder asks Analytics how many people use a feature, and Infra—if there are any errors in production. The entire cycle takes minutes.
LangChain, a separate Telegram bot, Redis for memory, a dashboard for budgets - all for one AI agent. I got tired of fixing the seams between five frameworks and wrote RustyHand: Agent OS in Rust. One binary, 180 ms cold start, 40 MB idle. Agents monitor my infrastructure on a single €5 VPS. No Python, no Node.js, no zoo.
I was looking for a decent library for AI agents in PHP. In Python, there are dozens of frameworks, and in Node.js, there's the Vercel AI SDK. In PHP, there are wrappers over the OpenAI API that can send requests and parse responses. But an agent is not a chatbot. It's a long-lived cycle with tool calls, streaming, and parallel execution of tools. All things PHP struggles with.