---
title: "AI agent: Definition"
description: "A system in which a language model decides which actions and tools to use, within defined limits, to complete a task, rather than following a fixed sequenc"
canonical: https://sudosapient.si/terms/ai-agent
updated: 2026-10-27
publisher: Sudo Sapient (https://sudosapient.com/)
---
# AI agent

**AI agent:** A system in which a language model decides which actions and tools to use, within defined limits, to complete a task, rather than following a fixed sequence of steps.

## Why it matters

When evaluating an agent, ask what tools it can call, what it is not allowed to do, how its outputs are validated in code, where a human approves and how its decisions are logged. Those answers predict reliability far better than which model it uses or how impressive the demo looked.

## Related terms

- [Agentic AI](https://sudosapient.si/terms/agentic-ai): An approach to building software in which AI agents pursue goals by planning and executing multi-step actions with tools, choosing each next step based on results.
- [Copilot](https://sudosapient.si/terms/copilot): An AI assistant embedded in a product or workflow that suggests or drafts actions for a human who stays in control of the final decision.

## Where it comes up

- [What is the difference between AI agents and agentic AI?](https://sudosapient.si/answers/what-is-the-difference-between-ai-agents-and-agentic-ai)
- [Agentic AI for Business: What It Is and What Actually Works](https://sudosapient.si/entries/what-is-agentic-ai-for-business)

## In practice

In a Sudo Sapient sprint, this is a building block of AI Product Development: agents, copilots and AI-native features shipped in 6–10 weeks. [Sudo Sapient's services](https://sudosapient.com/services/) describe the scope.