Create, edit, and clean spreadsheet files, including Excel workbooks and CSV data. Build formulas and formatting with openpyxl, a Python library, then recalculate and validate workbooks to check for formula errors and file problems.
Create, read, edit, fix, or clean spreadsheet files (.xlsx, .xlsm, .csv, .tsv). Use whenever a build task's artifact kind is spreadsheet, or the task names a spreadsheet file and wants something done to it or produced from it, including restructuring messy tabular data into a proper workbook. Covers openpyxl generation, formulas and recalculation, editing existing workbooks, and the validation gates. Not for tasks whose deliverable is a document, report, or web page that merely contains a table.
Review the instructions the agent will receive before you install.
An xlsx is generated with the preinstalled openpyxl library from a
generator script. Keep the generator under .src/: it is the editable
source for future revisions, and the binary is always regenerated from it.
| Task | Path |
|---|---|
| Create, or edit with formulas and formatting | openpyxl |
| Quick look at an existing sheet | muse.read (converted to markdown, paged); it carries no cell coordinates, so never plan edits from it |
| Read a workbook's model (formulas AND their values) | two load_workbook passes; see /opt/hatch/skills/artifacts/spreadsheet/references/formulas.md |
| Bulk or messy tabular data in or out | Python csv from the standard library; pip install --break-system-packages pandas when a task genuinely needs it |
| Design, structure, number formats, model conventions | /opt/hatch/skills/artifacts/spreadsheet/references/visual.md |
| Formulas, recalculation, editing existing workbooks | /opt/hatch/skills/artifacts/spreadsheet/references/formulas.md |
Requirements on every delivered workbook:
workbook.properties.title and a human-readable
filename. Data enters the workbook from the build's gathered content
only; a value you do not have is a blank cell or a question, never an
invented number.sheet["B10"] = "=SUM(B2:B9)",
not the Python-computed total. The sheet must recalculate when its
inputs change.| Script | What it does |
|---|---|
/opt/hatch/skills/artifacts/scripts/recalc_xlsx.py | Recalculates the workbook in place through headless LibreOffice and reports every formula-error cell as JSON; mandatory whenever the file contains formulas. errors_found exits 0: read the JSON, not the exit code |
/opt/hatch/skills/artifacts/scripts/validate_xlsx.py | Opens the workbook read-back: zip integrity, sheet parts, populated-cell counts; do not deliver a link while it fails. A csv output gets no reader check |
Run recalc_xlsx.py (when formulas exist), then validate_xlsx.py, then
follow /opt/hatch/skills/artifacts/testing/SKILL.md. A clean recalculation proves
the formulas evaluate, not that they are right: spot-check two or three
formulas pull the values you expect before building out a grid.
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