Lesson 373 of 1570
Agents You Already Use
You have already used agents — Alexa, Siri, Google Assistant.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1Agents You Already Use
- 2voice assistant
- 3NPC
- 4recommendation
Concept cluster
Terms to connect while reading
Section 1
Agents You Already Use
You have already used agents — Alexa, Siri, Google Assistant. The new ones are just much smarter.
'Alexa, set a timer' is an agent action. 'Hey Siri, book a hair appointment for Tuesday' (in newer iPhones) is a more complex agent action.
Three categories of agents you know
- Voice assistants (Alexa, Siri, Google)
- Game NPCs that act on their own
- Recommendation engines (YouTube, TikTok)
Key terms in this lesson
The big idea: Agents are not new — but the new ones can do MUCH more than their predecessors.
End-of-lesson quiz
Check what stuck
15 questions · Score saves to your progress.
Tutor
Curious about “Agents You Already Use”?
Ask anything about this lesson. I’ll answer using just what you’re reading — short, friendly, grounded.
Progress saved locally in this browser. Sign in to sync across devices.
Related lessons
Keep going
Builders · 18 min
Agents vs Workflows
A workflow is a fixed sequence of steps.
Builders · 18 min
Agents in Video Games
Modern video game NPCs use AI to react more naturally — they remember conversations, change behavior over time, and feel more alive..
Creators · 52 min
Production Agent Patterns: Queues, Retries, Idempotency
A prototype agent and a production agent have the same LLM. What's different is everything around it — durable state, retries, idempotency, observability. The real engineering.