AI agent
In one line: An AI system that can take actions on your behalf — calling tools, browsing the web, writing files — not just answering with text.
An AI agent is an LLM-powered system that doesn't just tell you something — it does something. Where a normal chatbot gives you a recipe for chicken curry, an agent could actually order the ingredients online.
Agents work by giving an LLM access to tools: a web browser, a code interpreter, a shell, a database, an email client. The LLM decides which tool to use, runs it, sees the result, and decides what to do next. This loop can run for many steps — agents tackle multi-step problems that don't fit in a single chat message.
Examples: Perplexity is a simple agent (tool: web search). Claude with Computer Use, ChatGPT Operator, and AutoGPT are more ambitious agent products.
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