A freelancer's AI skill library: one set of methods, every client

A worked example: a copywriter's library

Illustration: a made-up business. A freelance copywriter with four retainer clients keeps seven skills:

One method skill, in part:

---
name: method-monthly-report
description: Writes a client's monthly report from the freelancer's notes: results against the agreed targets, work done, what the client must do, next month. Use when asked for a monthly report or client update.
---
1. Results first, against the targets in the client skill or the notes. Only numbers given.
2. Work done: three bullets at most.
3. What the client must do, with a date.
4. Next month: three bullets at most.
Checks: no client name or fact that isn't in this client's skill or notes.

When Harbour asked to use the voice skill in its own Claude Team account, she shared client-harbour-voice and nothing else. She tests each method skill on two clients' real notes before trusting it with a third.

Build yours

1. List what you repeat for every client; each becomes a method skill.
2. Strip client facts out of the method; they go in that client's skill or project.
3. Name them so they sort: method-…, client-….
4. Test a method skill on two clients before using it for all.
5. Share single skills with clients who ask; keep the library yours.

Next step: selling the skills

Some clients will want to keep using a skill after the work ends. Giving clients an AI assistant that runs on their own ChatGPT or Claude covers how agencies and freelancers do that. For the file itself, see the SKILL.md format explained.

Questions

Should a freelancer build an AI skill library?

Yes, a small one. Write each method you repeat for every client (how you write a brief, a proposal, a monthly report) as one skill, once. Keep each client's facts apart, in a project or a client skill, so one client's details never leak into another's work.

How do I keep client work separate in my AI?

Split method from context. Method skills hold how you work and nothing about any client. Each client's voice, products and rules go in that client's own project or skill, named with the client's name, and you load only that one for their work.

Can I share a skill with a client?

Yes, one skill at a time. Share the client's own skill, or a method skill you're happy for them to keep; don't hand over the whole library. The SKILL.md format works in Claude and other tools, so the client can use it in theirs.