Anthropic Excel Skill

/plugin marketplace add anthropics/skills
/plugin install document-skills@anthropic-agent-skills

What it does

Anthropic Excel Skill is a document-processing agent skill from Anthropic's official skills repository that handles spreadsheet formulas, charts, cleanup and data transformations inside Excel files. In this directory it maps to the analyze-spreadsheets, generate-spreadsheets use case and is tracked for claude, claude-code. The source is a public GitHub repository, maintained by Anthropic. Maintenance, popularity, license and confidence signals are scored by rules; no hands-on testing has been performed, so this entry is a source-based profile, not a review.

• Works with .xlsx, .xlsm, .xltx, .csv, and .tsv files for analysis, cleanup, conversion, and structured output.
• Creates and edits formulas, formatting, tables, charts, and multi-sheet workbooks using documented spreadsheet libraries.
• Handles bulk tabular data and supports separate formula and cached-value reads for model inspection.
• Requires formula recalculation and error checking before a workbook with formulas is considered complete.

Best uses

• Cleaning a messy spreadsheet while keeping the result as a usable workbook.
• Building a formatted model, tracker, analysis, or chart-driven workbook with formulas.
• Editing existing Excel files while preserving their conventions and formulas.

Example tasks

• Clean malformed rows and misplaced headers, then deliver a properly formatted Excel workbook.
• Build a financial or operating model with visible assumptions, formulas, number formats, and charts.
• Add columns and formulas to an existing workbook without overwriting its established input cells or formulas.

Prerequisites

• A Claude environment with spreadsheet skill support and the documented spreadsheet-processing tools available.
• For Claude Code, add Anthropic's skills marketplace and install the document-skills plugin.
• Clarify the required output format, worksheet names, columns, formulas, and any conventions that must be preserved.

Limitations

• The source says not to use this skill when the primary deliverable is a Word document, HTML report, standalone script, database pipeline, or Google Sheets API integration.
• Some newer Excel functions are not supported by the documented verification runtime and need older compatible formula patterns.
• Macro-enabled files require explicit VBA preservation; careless saving can remove macros.
• The document skills are source-available under Anthropic's terms, not Apache-2.0 open source.

Sources checked

• Official XLSX SKILL.md
• Anthropic skills installation guide

Why it is listed

• official Anthropic source
• source updated 4 days ago
• clear install or source hint
• license signal: Source-available

Score breakdown

Maintenance

30/30

Provenance

25/25

Popularity

20/20

Completeness

15/15

Hygiene

10/10

Before installing

This profile is generated from public source fields and rules. It is not a verdict, not a rating, and not a substitute for testing the skill in your own workflow.