AI Agent
An AI agent is an LLM-powered system that pursues a goal over multiple steps — deciding what to do, using tools to act, and reacting to the results — rather than just answering a single prompt. The model is the brain; the agent is the loop around it.
Also known as: AI agents, agentic AI, agentic system
A chatbot takes a prompt and returns a response. An agent is given a goal and runs a loop: it plans an approach, calls tools to take real actions (search, run code, hit an API), observes what came back, and decides the next step — repeating until the goal is met or it gives up. That loop, not the model itself, is what makes something “agentic.”
The capability that unlocks agents is the model deciding when and how to act, not a human scripting every branch. That’s also what makes them hard to ship: more autonomy means more ways to go wrong, so production agents lean heavily on guardrails, evaluation, and memory to stay reliable. Much of the show is builders working through exactly that gap between a demo that works once and an agent that works every time.
Go deeper
From the conversation
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The Agent Bubble Debate | Spot AI's Kelly Vaughn -
How Block Deployed AI Agents to 12,000 Employees in 8 Weeks w/ MCP | Angie Jones -
The First Fully Autonomous AI Attack Is 18 Months Away | Kristin Lovejoy -
AI, Open Source & Developer Safety | Block’s Rizel Scarlett -
The Emerging AI Agent Stack | CrewAI’s João Moura -
How DeepSeek Changed the AI Race Overnight -
The AI Framework Era Is Over: Why Context Is the Moat | Jerry Liu -
Mastering Multi-Agent Systems | MongoDB’s Mikiko Chandrasekhar