# Your AI Probably Can't Build a Pivot Table — Here's What Can

> Source: <https://kookerella.com/posts/ai-agent-excel-pivot-table-sparklines/>
> Published: 2026-08-30 00:00:00+00:00

AI agents get asked to build Excel reports constantly. When a Python-based agent gets that
request, it almost always reaches for the same library: [openpyxl](https://openpyxl.readthedocs.io/).
So I ran a real test: give the same task to (a) a generic Python/openpyxl session and (b) an
agent using [Kookerella.FsOpenXmlDsl](https://github.com/Kookerella-Ltd/Kookerella.FsOpenXmlDsl)’s
MCP server, and look at what actually landed in the resulting file - not what either session
*claimed* it did.

Everything below is real: real code, run for real, with the resulting `.xlsx`

files inspected
by unzipping them (an `.xlsx`

is just a zip of XML parts) to check what’s objectively inside,
rather than trusting either tool’s own success message.