What happens when AI opens your model
The number an AI hands back is only as trustworthy as the way it touched your file. Three ways it can — and why only one of them keeps the model alive.
Tag
#product
Why a new file format
Better AI on Excel can't fix what's structurally wrong with the file. So we built a new one.
Show your work
The cell says 78.4% — but why? How a .deepcell keeps the reasoning behind every number, long after the chat that produced it is gone.
Round-tripping with Excel
Values flow both ways. Structure travels one direction at a time. Here's why that's the right tradeoff.
Anatomy of a .deepcell
Eight plainly labeled sections. Open one in any editor, read it like prose — and leave whenever you want.
How an analyst and Claude share a .deepcell
The file is the shared surface. The agent reads, edits, and proposes; the analyst signs.