Skill library / Claude

Data Analysis skill for Claude

Claude can run code on your data, but a skill gives it a repeatable method: check data quality first, then answer the question, then explain what it means.

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What it's good for

How the skill works

  1. Inspect columns, types, missing values and duplicates
  2. Clean data and log every change made
  3. Answer the user's question with exact calculations
  4. Create 1-3 charts that support the answer
  5. Write a summary: key insight, supporting numbers, caveats

Built-in rules

Example

You: “Here's our sales CSV, which products are growing fastest?”
Result: A cleaning log, a growth table, a line chart of top 5 products and a 4-bullet insight summary.

SKILL.md template

Save as data-analysis/SKILL.md.

---
name: data-analysis
description: "Analyses CSV or Excel data: cleans it, answers questions with calculations, and produces charts and a written summary of insights. Use when the user uploads a spreadsheet or CSV and asks for analysis, trends or charts."
---

# Data Analysis

## Workflow
1. Inspect columns, types, missing values and duplicates
2. Clean data and log every change made
3. Answer the user's question with exact calculations
4. Create 1-3 charts that support the answer
5. Write a summary: key insight, supporting numbers, caveats

## Rules
- Never fabricate data or fill gaps silently
- Show the formula or method for key numbers
- Label chart axes and units

How to install in Claude

In Claude, switch on Code execution and file creation (Settings → Capabilities), then go to Customize → Skills → + → Create skill → Upload a skill and choose the zip. Works on all plans, including Free.

Pro tip

Requires code execution enabled in Claude; add a references/metrics.md defining your KPIs.

Want it tailored to how you work?

Answer a few questions and get a customised version with examples, a Cursor rule and GPT/Gem instructions, emailed free.

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FAQ

How do I install the data analysis skill in Claude?

In Claude, switch on Code execution and file creation (Settings → Capabilities), then go to Customize → Skills → + → Create skill → Upload a skill and choose the zip. Works on all plans, including Free.

Is it free?

Yes. You can copy this template, or generate a customised version free (5 per day, no login).

Does it work on other platforms?

Yes. The SKILL.md follows the open Agent Skills standard, and every generated package also includes a Cursor rule and ChatGPT/Gemini instructions.

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