Summary  
This chapter demonstrates how to design explicit constraints in prompts to precisely control the tone of AI-generated messages.  

General domain of usage  
Business communications via AI prompts.

Same situation. Same facts. Three different audiences.

What changes is not what you say — but **how you constrain tone**. That's where control actually lives.


## The Scenario

You just discovered a bug in the invoice export. A paying customer, **Acme Corp**, received incorrect totals. Their finance lead, Janet, has emailed asking what's going on.
 
 
Your team already knows:

- root cause identified;
- patch release planned for tomorrow afternoon;
- manual corrections being issued in the meantime.

## Round 1 — Email To The Customer (Janet)

**Goal:** reassurance, clarity, trust. One apology — not two. Confident but not defensive.
 
 
Write a prompt that instructs Claude to draft this email. Make sure your prompt includes:

- who the audience is;
- the tone you need;
- at least two constraints that prevent common mistakes.

Send it. Read the output. If the apology appears more than once, or the tone feels cold — adjust your constraint and try again.

## Round 2 — Update To The CEO

Same facts. Different audience.
 
 
The CEO doesn't need reassurance or narrative. Write a new prompt — in the same conversation — that produces a purely factual update.
 
 
Try constraining it to bullet points, a maximum of five lines, and no emotional language. See what happens when you remove even one of those constraints.

## Round 3 — Engineering Slack Message

Last version. The audience is your own team — they already know the context, they just need to know what's happening and what to do.
 
 
Write a prompt that produces something casual, action-oriented, and short. No greeting, no sign-off.

## After All Three

Read the three outputs side by side. The facts are identical across all of them.
 
 
Ask yourself:

- what constraint produced the biggest difference in tone?;
- which version did Claude get wrong on the first attempt?;
- what did you have to add or remove to fix it?

That's the real lesson — not the emails themselves.

## Key Insight

Most people try to control tone by writing:

>"Make it polite" or "Make it professional"

That doesn't work. Real control looks like:

>"One apology only. No filler. Bullet format. Five lines maximum."

Tone is not style. **Tone is constraint design.**

A hands-on, beginner-friendly course designed for non-technical business users to understand and leverage AI tools and concepts in their daily work. The course covers foundational AI concepts, effective communication with AI, practical use of AI-powered tools, and building simple AI assistants.

Introduction to artificial intelligence, large language models, and essential AI vocabulary for business users.

Learn how to communicate effectively with AI systems through prompt engineering and tone selection.

Explore how AI can be integrated with business tools for research, note-taking, and data analysis.

Learn the basics of agent personas and how to build and tune simple AI assistants for work.