Use XLSX by Anthropic to create, read, clean, or edit spreadsheet files with an agent. Organize source data, preserve an existing workbook’s conventions, and build formulas that respond to changing inputs, then recalculate and check the output before delivering the spreadsheet.
Provide the workbook or raw data with column meanings and calculation requirements. The request can bound the target ranges, preserve formulas and source meaning, and define recalculation and sample checks before accepting the saved spreadsheet as correct.
Specify source columns, grouping dimensions, totals, and treatment of missing values.
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Reference: XLSX https://github.com/anthropics/skills/blob/main/skills/xlsx/SKILL.md Read the original documentation and check the current environment and dependencies. Propose any new installation or tool connection before proceeding. My task: Clean this sales CSV and create an XLSX summary by month and product. Preserve the source rows, use formulas for totals, document assumptions, and recalculate before delivering the workbook. Expected deliverable: A recalculated workbook with traceable source rows, formulas, and documented assumptions.
XLSX is Anthropic’s document Skill for tasks whose primary input or output is a spreadsheet file. It covers workbook creation and editing, tabular-data cleanup, formulas, formatting, charts, and supported file conversions. The source distinguishes formula text from cached results and requires recalculation when formulas are present, so a file that opens is not the final check. Existing workbook conventions and designated input cells also matter when making changes. Provide the source files, column meanings, calculations, and required output before execution. The environment needs the libraries and recalculation utilities used by the selected workflow. This Skill is source-available under Anthropic’s proprietary document license.
Cleaning a table, building formulas, and updating an established workbook carry different preservation requirements. Examine how XLSX tasks retain source meaning, expose assumptions, and verify references without turning calculated results into unexplained fixed values.
An inconsistent table needs its column meanings and rules for unusual records established before cleaning. Normalize misplaced headers, malformed rows, and data types without changing what the source values mean. Keep ambiguous entries flagged so a tidy appearance does not conceal unresolved data questions.
A formula-driven workbook should express calculation rules as formulas that respond to new inputs. Place assumptions where readers can inspect them and organize outputs around the comparisons they need to make. Recalculate the workbook and check errors before delivering an editable model rather than a collection of fixed results.
A bounded spreadsheet update needs the target ranges and formulas to preserve identified in advance. Follow the workbook's established styles and input conventions, then check affected formulas and references after editing. Leave unrelated areas intact so existing calculations remain usable alongside the new information.
An updated assumption or source range can leave formulas pointing to an outdated cell even when the workbook opens normally. Inspect the affected references and recalculate the relevant outputs, comparing selected results with known inputs. Preserve the workbook's conventions and report unresolved dependencies so the review explains the calculation path rather than just the final number.
Spreadsheet changes depend on knowing what each column and calculation means. Bound the requested cells or output, then recalculate formulas and compare representative results with source data before accepting the saved workbook as a correct deliverable.
Share files, column definitions, and the required output. Identify designated input cells and calculations that must be preserved.
Ask the agent to apply the relevant file workflow. Keep source meaning intact and use formulas where the output must update with inputs.
Run the source’s recalculation workflow for formulas and fix reported errors. Compare sample values, references, and formatting with the requested result.
Read another Skill guide and check its original source before using it.
