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.
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What AI-traceable reasoning looks like inside a .deepcell.
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 sections of plain XML. Open one in any editor and read it like prose.
How an analyst and Claude share a .deepcell
The file is the shared surface. The agent reads, edits, and proposes; the analyst signs.