Edwy
AI Primer

Agentic AI · Module 20

From language model to agent

An agent is an LLM wrapped in a loop that can use tools, maintain memory, plan, and execute multi-step work.

Tools

The agent can call code: search the web, run a SQL query, send an email, control a browser, edit files.

Memory

Short-term scratchpad for the current task; long-term store of prior decisions and learned patterns.

Planning

The agent decomposes a goal into steps, executes, observes the result, and revises the plan as needed.

Plan act observe review loop around a language model agent
Draft for editor review: an agent wraps a model in a repeatable work loop.

From model to agent loop demo

A local toy loop that logs the plan, act, observe, and review steps named in this module.

const steps = ['plan', 'act', 'observe', 'review'];
for (const step of steps) {
  console.log('agent loop:', step);
}
Run the demo to see sandboxed console output.

Agent loop check

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1. Name one failure mode when an agent skips the observe or review step.

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Source slide 21