Evidence
What it handles, and where it breaks
Kantaja is a language model driving a spreadsheet editor. Here is what survives the .xlsx round trip, exactly what revert restores, and the mistakes worth watching for.
.xlsx compatibility
| Feature | Support | Detail |
|---|---|---|
| Cell values and text | Supported | Round trip through import and export. |
| Formulas | Supported | Written as normal formulas, recalculated in the grid. |
| Number formats | Supported | Currency, percent, decimals and thousands separators. |
| Multiple sheets | Supported | All sheets in the workbook are kept. |
| Cell styling | Partly supported | Bold, fill and text colour survive. Unusual theme styling can be simplified. |
| Charts | Not supported | Not imported and not written back. |
| Pivot tables | Not supported | Not supported. |
| Macros (.xlsm) | Not supported | Not supported. |
Anything unsupported is dropped rather than mangled, so keep the original file until you have checked the export.
What revert restores
A run is everything the assistant did in answer to one request. Reverting a run puts back the previous contents of every cell those actions wrote to: values, formulas and formats. It does not touch edits you made by hand, and it does not remove files from the knowledge base. Read-only actions, reading a range and searching your documents, change nothing, so there is nothing to undo.
Known failure modes
It picks the wrong column
A request like "add a margin column" can land next to the wrong data when headers are ambiguous. The action log names the exact range, so check that first.
It answers from the wrong document
When several attached files mention the same figure, the search can pick the wrong one. Each search_files call shows the query it ran, so you can see what it matched.
It writes a value where a formula belongs
Ask for a formula explicitly when you want the cell to keep recalculating.
A long =AI() fill drifts
Filling down hundreds of rows can produce inconsistent phrasing. Spot-check the first and last rows before you rely on the column.
How to review a run
- 1. Read the action log and check the range each action names.
- 2. Click into two or three written cells and read the formula, not the result.
- 3. Compare one grounded value against the source passage in the document.
- 4. Keep it, fix a cell by hand, or revert the whole run.