Agent (AI)
An AI that doesn't just answer but takes sequential decisions with access to tools.
Claude Code, Devin, and ChatGPT with "tools" are agents. They can choose to read a file, run a command, see the result, and decide the next step — in a loop until the task is done. The difference from a raw LLM is that the agent has agency.
Often driven by MCP-connected tools and a system prompt describing what tools are available. The risk: an agent that's misread the situation can do many dumb things before someone stops it.