What modern AI systems do
Tell which part of an AI system does each job.
Reviewed: 2026-10-03
Source-based teaching example · Fictional data
Narration: Microsoft Mark · locally synthesized

00:00:00.000 — What you will learn

Tell which part of an AI system does each job.

Visual description:
Tell which part of an AI system does each job.

00:00:05.875 — The idea

The model writes the answer. The app is the service you use. Other software gives the model information and controls its tools.

Visual description:
The model writes the answer. The app is the service you use. Other software gives the model information and controls its tools.

00:00:17.417 — One useful term

Harness. The software that connects a model to instructions, information and tools. Its surrounding controls must enforce permissions.

Visual description:
The software that connects a model to instructions, information and tools. Its surrounding controls must enforce permissions.

00:00:30.208 — A worked example · 1

Imagine asking a travel assistant if it will rain tomorrow. A weather tool supplies a current forecast. The model turns that forecast into an answer.

Visual description:
Imagine asking a travel assistant if it will rain tomorrow. A weather tool supplies a current forecast. The model turns that forecast into an answer.

00:00:42.875 — A worked example · 2

Writing about rain is different from checking the forecast.

Visual description:
Writing about rain is different from checking the forecast.

00:00:49.042 — Your turn to think

Without a weather source, does a confident answer prove tomorrow’s weather? Pause and decide before continuing.

Visual description:
Without a weather source, does a confident answer prove tomorrow’s weather?
Pause the video if you need more time.

00:01:06.958 — Why this answer works

No. The assistant needs current weather evidence. If that evidence is missing, it should say the answer is unknown.

Visual description:
No. The assistant needs current weather evidence. If that evidence is missing, it should say the answer is unknown.

00:01:17.458 — Check 1

Find the source of current facts.

Visual description:
Find the source of current facts.

00:01:22.625 — Check 2

Check which tools can act.

Visual description:
Check which tools can act.

00:01:27.292 — Check 3

Keep unknown facts marked as unknown.

Visual description:
Keep unknown facts marked as unknown.

00:01:32.625 — Now try a different case

Open the lesson and try its different practice case. Use every check in the full task. Watching alone does not mark the lesson complete.

Visual description:
Open the lesson
Try the new case
Check and revise
The full task and its requirements are in the linked lesson.