Mathieu Kessler | AI at Work

Mathieu Kessler

Mathieu Kessler

prompts

+3

I gave three assistants a commentary that was 0.2 short. Two said it was fully explained.

Sep 22, 2026

•

7 min read

I gave three assistants a commentary that was 0.2 short. Two said it was fully explained.

Four month-end prompts for finance teams, each run on three assistants before sending, and the one practice under all of them: the assistant drafts, a person approves.

Mathieu Kessler

prompts

+2

I gave three assistants a status update. Two added a deadline problem that was not in it.

Sep 8, 2026

•

6 min read

I gave three assistants a status update. Two added a deadline problem that was not in it.

Four prompts that make an assistant declare what it did to your text. I ran all four before sending this, and the results are less flattering than I wanted.

Mathieu Kessler

The Kit is half a rollout

Aug 30, 2026

•

1 min read

The Kit is half a rollout

Why the Playbook is in the box this week

Mathieu Kessler

What is in it, and who should not buy it

Aug 28, 2026

•

1 min read

What is in it, and who should not buy it

Including the three groups I would rather turn away

Mathieu Kessler

Month two is where it dies

Aug 26, 2026

•

1 min read

Month two is where it dies

Not the pilot. The month after the pilot.

Mathieu Kessler

The 40 licences nobody is using

Aug 25, 2026

•

1 min read

The 40 licences nobody is using

A one-week window, and the reason I am opening it

Mathieu Kessler

One thing: your Copilot and your colleague's may run different models

Aug 11, 2026

•

1 min read

One thing: your Copilot and your colleague's may run different models

Check your model list before sharing prompts.

Mathieu Kessler

The Kit bundle closes tomorrow night

Jul 20, 2026

•

1 min read

The Kit bundle closes tomorrow night

Everything you get, the 10-seat team option, and the exact close time.

Mathieu Kessler

The sentence that decides your Copilot budget meeting

Jul 18, 2026

•

1 min read

The sentence that decides your Copilot budget meeting

One artifact from inside the Kit, opened up so you can judge the quality yourself.

Mathieu Kessler

We already have Microsoft’s adoption kit

Jul 16, 2026

•

1 min read

We already have Microsoft’s adoption kit

Fair objection. Here’s the honest difference, and the build-it-yourself math.

Mathieu Kessler

Why Copilot rollouts fail quietly (and a week-long offer)

Jul 14, 2026

•

2 min read

Why Copilot rollouts fail quietly (and a week-long offer)

My first dedicated launch to this list, with the honest version of the pitch.

Mathieu Kessler

5 Copilot prompts that survived real PM projects (and 3 that failed)

Mar 10, 2026

•

6 min read

5 Copilot prompts that survived real PM projects (and 3 that failed)

Anthropic got blacklisted. Copilot got an agent. And most prompts still ask AI to imagine instead of read.

Mathieu Kessler