Jeremy Neely Text Jeremy

AI & Agents · Beta

Secure AI for Excel

Chat with any Hatz AI model inside Excel and let it do the work.

Built for: Secure AI clients and AME staff who work in Excel

The add-in adding a total row and a chart to a sales sheet (sample data).
The add-in adding a total row and a chart to a sales sheet (sample data).

The problem

Secure AI clients wanted an AI that works inside Excel on the Hatz models and credits they already pay for. Copying between a chat window and a spreadsheet is slow, and an AI that edits a workbook needs guard rails.

What I built

I built an Excel task-pane add-in that lets a user chat with a Hatz model about the open workbook and have it act through 22 typed Excel tools. It has confirmations, undo and spending limits, and no backend.

How it works

  1. Install through Microsoft 365 or a no-admin sideload installer.
  2. Paste a Hatz API key and pick a model.
  3. Ask a question; a short overview of the workbook goes with it.
  4. The model calls tools such as read, write, sort, chart and pivot.
  5. Risky steps ask first, and Undo reverses the last request.
How Secure AI for Excel is wiredA static site with no backend: the key stays in the add-in's own storage and is sent only to Hatz.
Comes inInside Secure AI for ExcelGoes out User's question in the task pane Open workbook short overview sent along Hatz API key per user, stored locally Hatz AI model streaming, any Hatz model 22 Excel tools read, write, sort, chart Guard rails confirm, undo, spend limit Workbook changes applied via Office.js Action list each step shown

Built with

  • TypeScript
  • React 18
  • Vite 6
  • Office.js
  • Vitest
  • Azure Static Web Apps
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More screens

The task pane in the dark theme, listing each action it took (sample data).
The task pane in the dark theme, listing each action it took (sample data).
A new chat offering quick actions to get started.
A new chat offering quick actions to get started.
First-run settings for the Hatz API key.
First-run settings for the Hatz API key.

More of Jeremy's work

All 38 tools, by category