Explainer

What is an AI Agent? A Plain-English Guide

Everyone is talking about AI agents but few people explain what one actually is. This guide cuts the jargon and gives you a clear definition, real examples, and a practical test for whether your business needs one.

The Simple Definition

An AI agent is software that uses artificial intelligence to take actions toward a goal. Not just answer questions, take actions.

The key words are 'take actions'. A chatbot answers questions. An agent does things.

Example: you ask a chatbot 'what are the top sales leads for this week?' It tells you. You ask an agent 'handle my sales leads for this week'. It researches them, drafts outreach, and schedules follow-ups.

How Agents Differ From Chatbots

Chatbots respond. Agents act.

Chatbots stay in conversation. Agents leave the conversation to do work.

Chatbots have no memory of previous tasks. Good agents do.

Chatbots are bound to text. Agents use tools: APIs, databases, web browsers, code execution.

Chatbots give you information. Agents change the state of the world.

How Agents Work Under the Hood

Planning: the agent breaks down the goal into steps.

Tool use: the agent picks the right tool (web search, API call, database query, email send) for each step.

Execution: the agent runs the tools and observes results.

Reflection: the agent checks whether the goal is achieved. If not, plan again.

Repeat until done or stuck.

Real-World Examples of AI Agents

Personal assistant agents: Lindy, Operator, Claude's computer use. Handle email, scheduling, research.

Coding agents: Cursor, Devin, GitHub Copilot Workspace. Write, test, and debug code.

Research agents: Perplexity Pro, Elicit. Dig through the web or academic papers for answers.

Sales agents: custom workflows on Gumloop, Relay, or Lindy that qualify leads and draft outreach.

Support agents: automated customer service that actually resolves issues, not just routes them.

When Your Business Needs an Agent vs a Workflow

Use a workflow when the steps are known and repeatable. Cheaper, more reliable, easier to audit.

Use an agent when the steps depend on what the agent finds along the way.

Use a workflow for production-critical customer-facing work.

Use an agent for internal research, drafting, and flexible tasks.

Most mature systems use both: workflows for the common case, agents for the exceptions.

The Real Limits Today

Reliability: agents still fail in surprising ways. Always have a human review path for customer-facing work.

Cost: agents make 5 to 50x more LLM calls than simple workflows. Costs add up.

Time: complex agent tasks can take minutes. Be careful in time-sensitive flows.

Predictability: same input does not always produce same output. Plan for variance.

Explainability: it can be hard to understand why an agent did what it did. Log everything.

Frequently Asked Questions

Base ChatGPT is a chatbot. ChatGPT with tools enabled (browsing, code interpreter, custom GPTs) behaves more like an agent because it can use tools to take actions.

Research a company, draft and send emails, book meetings, process documents, answer support tickets, write code, qualify leads, monitor competitors, and more. The list grows every month.

Parts of jobs, yes. Whole jobs, rarely. Most useful agents augment humans rather than replace them. Think 'AI handles 70% of tier-1 support tickets so humans focus on the hard 30%'.

With the right guardrails, yes. Limit what they can do. Require human approval on high-stakes actions. Log everything. Do not give an agent unrestricted access to your bank account.

Use a no-code platform (Gumloop, Lindy, Relay) or a framework (LangChain, CrewAI, AutoGen). Start simple and add capabilities as you learn.

A copilot suggests and a human acts. An agent acts on its own. Copilot for coding, agent for running tests and submitting PRs. The line is blurring.

Probably start with workflows, not agents. Workflows are cheaper and more reliable. Move to agents when you hit the limits of what workflows can do.