XLSX Analysis
Official skill for formulas, pivots, and multi-sheet workbooks an agent can reason about.
Use it for
Reconciling two exports and writing the result back into a sheet with real formulas
Skip it if
Very large workbooks where per-cell tool calls become the bottleneck
What it is
An official spreadsheet skill that reads cell ranges, follows formulas, and writes values back with formatting. It is the difference between an agent that can quote a number and one that can update a model without destroying the sheet. Formula recalculation is the part most tooling gets wrong, and this skill is built around it.
Install
Clone the repository, then copy the skill folder into your agent's skills directory — ~/.claude/skills/ for Claude Code. Skills are plain files: no build step, no daemon.
npx skills add https://github.com/anthropics/skillsHow to judge it
Read the SKILL.md before you install. A good skill states when it applies, what it must not do, and how to verify the result. A skill that only lists adjectives will change the agent's tone without improving its output — skip those.
Other Productivity skills
- Claude Code Templates — A large catalogue of ready-made agent components: skills, agents, and commands.
- Skill Creator — Official skill for writing a new agent skill with the right structure.
- PDF Processing — Official skill for extracting, splitting, merging, and filling PDFs from an agent.