Input XLSX File

How it fits

Typical backends

Caveats

• Hard constraintsheet names a worksheet rather than indexing one, falling back to the workbook's active sheet when empty; an unknown name fails the read. Only one sheet is emitted per file, so multi-sheet workbooks need several instances.
• I/O contractAll cell values come out as strings, so downstream stages must cast typed columns; date and time cells surface as Excel's stored serial value and empty cells as empty strings.
• LimitationFormulas are not evaluated — the last value Excel cached is read — so a workbook saved without cached values yields empty cells for formula columns.
• Parameter interactionhas_header treats the first row as column names when on, and otherwise leaves the header empty and reads every row as data.
• State lifetimeThe bound slot, sheet, has_header, repeat, and fps are hot-swappable, and changing the slot restarts from the new directory.