The skill that shows where your 80 percent comes from
Paste your customer list, to-do list or cost items into Claude and get an 80/20 analysis that shows what's really having an impact, what can be deleted, and what you should start with on Monday.
Why this skill you focus back gives
Most entrepreneurs work incredibly hard but don't know where the return comes from. Pareto shows that. This skill provides the analysis you haven't put into a spreadsheet yourself.
Real relationship
It's not always 80/20. Sometimes it's 70/30, sometimes 95/5. This skill calculates the actual ratio so you don't rely on assumptions.
Three groups, not two
Top, middle and tail. Each group gets its own action. No vague advice but three concrete steps you can take on Monday.
Cut or double
The skill gives you per group what you need to do. Cut, optimise, or double. No noise, just direction.
Built-in pitfalls
Survivorship bias, the short measurement period, hidden costs. The skill automatically flags them so you don't draw the wrong conclusion.
How the skill your list calculates
Paste your data into Claude, describe what you see as a result, and the skill runs a fixed five-step analysis. No slick sales talk, just what the numbers say.
Works with any list
Customers, tasks, products, cost items, channels, projects. Anything that can be ranked by value goes in.
Calculates in seconds
Sorting, percentages, cumulative, three groups. What takes half an afternoon on a spreadsheet is done in thirty seconds.
You can paste
The skill gives you markdown that you can directly put into Notion, Google Docs or an email to your team. No extra work.
Be honest
The gap highlights what she couldn't measure and what pitfalls are in your data. No false confidence, just a sharper insight.
Stick your list
Leverage the data: items with a measurable value. Doesn't have to be a perfect spreadsheet, a rough list works fine.
Specify the metric and period
What do you see as the result? Revenue, margin, hours, conversions, complaints. And over what period has this been measured?
The skill sorts and groups
Top, middle and tail are determined based on cumulative value. The actual proportion is calculated, not assumed.
Actions per group
For each group, you will receive a concrete Monday action. Double, optimise, or cut. With a reason why.
Pitfalls and open questions
The gap indicates which assumptions remain unproven and which data you are still missing to truly sharpen the analysis.
A real output, no mockup
This is what you get back when you feed 12 SEO clients with their annual turnover into the skill. Literally the output, only the naming has been anonymised.
What I have analysed
12 SEO clients ranked by annual turnover 2025, total €67,700The actual ratio
4 customers (33 percent) generate 70 percent of your revenue Slightly flatter than the classic 80/20, so your risk diversification is averageThe three groups
Vitality top (4 customers, 70% of revenue): A, B, C, D Monday's action: individual review meeting, discuss 2026 scope Middlemost (4 customers, 21% of revenue): E, F, G, H Monday action: email with expansion offer (audit, content, GMB) Tail (4 customers, 9% of revenue): I, J, K, L Action Monday: increase rate to 95/hour or polite farewell letterThree sharp observations
1. Customer A is a single point of failure (27% of revenue) 2. The tail is likely to cost more hours than your top customer 3. The middle segment has the most upsell potentialPitfalls to watch out for
– You're measuring turnover, not profit. Include hours in the next analysis. – One year of data, repeat next quarter for patterns. [output continues with open questions...]With this skill versus without skill
Most entrepreneurs apply the 80/20 rule by gut feeling. This skill does it using numbers, and pushes you towards decisions you'd otherwise postpone for months.
Without skill
- Your sentiment analysis doesn't know what customer A truly yields versus customer H.
- Every month, doubt creeps in again about whether to keep those tail customers
- Too many hours on low-margin clients, too few on your top four
- A single point of failure you don't see coming
- Survivorship bias and short-term noise colour your decisions
With this skill
- The actual ratio at the table, no assumption
- Three concrete Monday actions, one per group
- Hidden costs and single points of failure directly highlighted
- Is applicable in your project management or customer email
- The skill keeps you honest about what she couldn't see
The prompt behind the analysis
No secret. You see exactly which instruction the skill is giving to Claude here. This way, you can further refine it yourself for your specific situation.
Frequently Asked questions
The most frequently asked questions about the Pareto Analyst skill for Claude. Is one missing? Email us.
What exactly is a Claude skill?
A Claude skill is a set of instructions that you can install in Claude (on Pro or Team). As soon as you ask a question that matches the skill, Claude switches to the workflow detailed in the skill. For this Pareto skill, that means: as soon as you share a list of data, Claude automatically performs an 80/20 analysis according to a fixed structure.
Does this skill only work on customer lists?
No. The skill works on any list you can rank by a metric. Customers by revenue, tasks by time, products by margin, cost items, channels by conversions, projects by return. As long as you have items with values, the skill will do the analysis.
Is de 80/20-regel niet een te simpel principe voor het moderne bedrijfsleven?
The skill looks beyond the classic 80/20 rule. It calculates the actual ratio (often 70/30 or 95/5) and builds three groups instead of two. Additionally, it addresses survivorship bias and hidden costs, things on which the pure 80/20 rule founders.
How large should my dataset be?
A Pareto analysis needs a minimum of 8 to 10 items to become skewed. Below that quantity, any distribution is statistically flat. Above 10, the pattern becomes visible. The skill works perfectly with up to a few hundred items.
Will I get graphs back as well?
The skill provides text output: percentages, lists, and actions. No charts in the chat. However, you can paste the output into a spreadsheet to create a chart yourself, or ask Claude to create a mermaid diagram.
Can I adapt the skill for my field?
Yes. The skill is just markdown. You can open SKILL.md, add your own examples, or adjust the style. Just make sure to keep the five phases and three groups, as that's the core.
How much does the skill cost?
Nothing. The skill is free to download and has an MIT licence. You will need a Claude account (free or paid) to use it.
Take the skill and apply it today
Download SKILL.md as a zip, place it in your Claude skills folder, and you can immediately run your first 80/20 analysis on your customer list, task overview, or expense report.
Download skill (zip)Sea Claude skills
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