What xlsx is Uses openpyxl for formulas and formatting, pandas for bulk data; triggers whenever a spreadsheet is the primary input or output.
What it does How xlsx plugs in: which agents run it and what it adds RUNS IN Your agent Claude Code one host documented SKILL · OFFICIAL xlsx Reusable instructions and scripts… 4 install steps 1 permission note license: Proprietary (LICENSE.txt in… WHAT IT ADDS What it does Handles the file format named in… Edits formulas and formatting wit… Points to bundled scripts and ref… agent → extension → new capability · from the official repository or docs Where xlsx runs and what it adds, from its documentation Handles the file format named in its description Edits formulas and formatting with openpyxl Points to bundled scripts and reference files When to use it
Good fit The user mentions a .xlsx file or wants one produced Not for Tasks outside this file format (see description's Do NOT use list) How to install xlsx Register the marketplace in Claude Code: /plugin marketplace add anthropics/skills Install the bundle that contains it (document-skills or example-skills): /plugin install document-skills@anthropic-agent-skills Or copy the skill folder to ~/.claude/skills/xlsx/ (personal) or .claude/skills/xlsx/ (project) Mention the task in a prompt; Claude loads the skill automatically when the SKILL.md description matches Permissions and security What it can access Instructions loaded into Claude's context; any scripts it bundles run through Claude Code's normal tool permissions (shell, file edits) Security notes from the maintainers Anthropic repo disclaimer: skills are provided for demonstration and educational purposes; behavior in Claude may differ Review the source before granting an agent access to credentials or production systems. We document what the maintainers state; we do not audit code.
Limitations Repo README says implementations are examples and may differ from what Claude.ai provides
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Anthropic's agentic coding tool that reads your codebase, edits files and runs commands from the terminal, IDEs, desktop app or browser.
Watch out: Not included in the Free Claude plan, and usage on subscriptions is capped by plan limits.
Listed Not yet reviewed
Verified Sep 29, 2026
code.claude.com ↗ (opens Claude Code website in a new tab)
Frequently asked questions How do I install the xlsx skill in Claude Code? Add the marketplace with /plugin marketplace add anthropics/skills and install the bundle containing it, or copy skills/xlsx into ~/.claude/skills/. source
When does Claude use the xlsx skill? Claude loads it automatically when the request matches the description field in its SKILL.md frontmatter. source
Is the xlsx skill official? Yes, it is published in Anthropic's anthropics/skills repository. source
Sources and gaps Not stated by the maintainers: last_release (repo has no releases read); exact library requirements beyond those named in SKILL.md.
