# What is AI agent?

Source: https://mushbloom.uk/resources/glossary/what-is-ai-agent.html

By Mushbloom. Published and updated: 2026-10-12.

## Definition & overview

An AI agent is a software system that uses a model to choose actions and interact with tools toward a defined goal. Its access, instructions and approval boundaries determine what it can safely do.

## Analogy & mental model

Think of a junior assistant with a task list and a restricted set of keys—not an unsupervised employee.

Define the agent’s role, approved data, tools and escalation rules before connecting business accounts.

## Why it matters

Agents become useful when a task needs more than one fixed response, such as checking information and selecting a next action. They also introduce operational risks because a wrong action can affect customers or records. A defined role is more valuable than an impressive claim of autonomy.

## Practical business example

An enquiry agent categorises a request and drafts a reply. A staff member approves a price exception rather than letting the agent invent a discount.

Illustrative scenario, not a client case study or promised result.

## How it works

1. Give the agent a narrow goal and the minimum tools needed to complete it.

2. Let the model propose an action, then validate its arguments and permissions outside the model.

3. Record the result and route exceptions or sensitive actions to a person.

## Core components

- Role and goal

- Tool access and action validation

- Approval and audit trail

A natural-language instruction is not a substitute for a server-enforced permission.

## AI agent vs Workflow automation

A fixed workflow follows predefined branches. An agent can select actions within those boundaries; the workflow still controls permissions, approvals and handoffs.

## Frequently asked questions

What does AI agent mean?
An AI agent is a software system that uses a model to choose actions and interact with tools toward a defined goal. Its access, instructions and approval boundaries determine what it can safely do.

How is it different from Workflow automation?
A fixed workflow follows predefined branches. An agent can select actions within those boundaries; the workflow still controls permissions, approvals and handoffs.

What is a sensible first step for a small business?
Define the agent’s role, approved data, tools and escalation rules before connecting business accounts. Give the agent a narrow goal and the minimum tools needed to complete it.

What limitations should I keep in mind?
A natural-language instruction is not a substitute for a server-enforced permission.

## Sources

Google Cloud: Retrieval-augmented generation: https://cloud.google.com/use-cases/retrieval-augmented-generation

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