AIBaseWhat Is an AI Agent? A Clear Guide to Tools, Memory and Actions
An agent is a system that uses a model to decide and perform actions toward a goal.
- An agent is a system that uses a model to decide and perform actions toward a goal.
- Tools allow the system to interact with software or data; memory can preserve useful context.
- Autonomy exists on a spectrum, from approval-heavy assistants to systems that act independently within limits.
A simple definition
An AI agent is software that combines a model with tools and a loop for deciding what to do next. Instead of producing one answer, it can plan, act, inspect the result and continue.
Tools
Tools may include web search, code execution, databases, calendars or business applications. Tool permissions define what the agent can actually do.
Memory
Memory can mean short-term task state, stored user preferences or an external database. The important question is what is saved, for how long and who controls it.
Autonomy
Some systems ask before every important action. Others can complete many steps independently. More autonomy can save time, but it increases the need for boundaries and monitoring.
Why it matters
An agent is not “a smarter chatbot.” It is a system that turns model output into decisions and actions.
Explore the next step
Put this topic in context with the model library, tool profiles and comparison board.
Sources & notes
Last updated 1 Oct 2026. Editorial policy · Corrections policy
