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The Baker's Dozen · Cultivated AI · Lab 03

Write your own skill

A skill is a method you save once and reuse forever: your best way of doing one repeatable task, written down so the AI does it your way every time. In Session 2 everyone writes one with Claude's skill creator, installs it, and runs it on real work. Pick the card closest to your week, or bring your own.

How this works

  1. Copy the prompt from your card below. It carries the method, the rules and a stand-in example. Claude will ask you for a real one.
  2. Paste it into a new chat on claude.ai. The skill creator interviews you, writes the skill, tests it once, and hands you a zip.
  3. Install the zip under Customize, Skills. Then run it on a real piece of this week's work. What it got wrong goes into the rules. Run it again.
Eleven ideas

Pick your chore

One idea for every corner of the company, matched to the worlds from the questionnaire. Each one is a task somebody at the company already does every week by hand. The test of a task worth saving: you do it at least weekly, and you already have one finished example that shows what good looks like.

🥐 Kitchen & production

SOP writer

Turns how you actually do it into a document anyone can follow.

Feed itA voice-note transcript or rough steps for one kitchen process.

Get backA clean numbered SOP with quantities, timings and the checks that matter.

📦 Operations & supply

Vendor chaser

Follow-ups that get firmer each round without burning the relationship.

Feed itThe vendor, what's pending, and how many times you've already asked.

Get backA follow-up message in your voice, matched to the round you're on.

🛵 Marketplace

Review responder

Replies in brand voice, and it knows what not to answer.

Feed itA batch of customer reviews pasted straight from the platform.

Get backA reply for each, with the ones needing a real human decision flagged instead of answered.

📣 Marketing & content

Caption machine

Your brand voice, saved once, applied every time.

Feed itWhat the product is, the occasion, and one line about the photo.

Get backThree caption options with hashtags, sized for each platform.

📈 Trade

Quote writer

From order details to a client-ready quote in one pass.

Feed itThe buyer, products, quantities and any special terms.

Get backA formatted quote, plus the follow-up message to send three days later.

🧾 Finance & accounts

Expense untangler

Messy lists in, books-ready tables out.

Feed itA pasted block of expenses or bank entries.

Get backA categorised table with GST split out and anything odd flagged for a second look.

🤝 People & admin

Hiring kit

One role description becomes the whole hiring toolkit.

Feed itThe role, and the three things the person must be able to do.

Get backA job post, interview questions that test those exact things, and a simple scorecard.

🎨 Design & creative

Brief translator

Turns "make it pop, need it Friday" into a brief you can work from.

Feed itThe vague request exactly as it arrived.

Get backA proper brief with sizes, formats and deadline, plus the questions to send back.

💻 MIS

Data cleaner

The cleanup you repeat every week, done your way automatically.

Feed itA pasted block of messy spreadsheet data.

Get backCleaned rows in consistent formats, with duplicates and oddities listed separately so nothing vanishes silently.

⚖️ Legal

Contract summariser

Every agreement read the same careful way.

Feed itA contract or terms document.

Get backA plain-language summary, every date and deadline in a table, and the clauses worth a lawyer's eyes flagged.

🧭 Founding & leadership

Minutes machine

Every meeting ends with clear owners and dates.

Feed itRough meeting notes or a transcript.

Get backMinutes with decisions, owners and deadlines, plus a drafted follow-up for each owner.

If none of these fit

Copy any card's prompt and replace the When, Feed, Get back, Method and Rules sections with your own task. Keep the last two sections: they are what make Claude build and package it properly.

Claude

From brief to skill

Custom skills need a paid Claude plan (Pro, Max or Team) and one setting switched on. Five steps from a pasted brief to a zip in your downloads.

  1. A

    Switch on file creation.

    On claude.ai open Settings, then Capabilities, and turn on "Code execution and file creation". Skills run inside it. On a Team plan the admin may have done this already.

  2. B

    Check the skill creator is on.

    Open Customize, then Skills. Anthropic's own skills are listed there; make sure Skill creator is switched on. If you cannot see it, carry on: the prompt asks Claude the same questions.

  3. C

    Paste your card into a new chat.

    Claude interviews you: a few questions, one at a time, and it will ask for a real finished example. Answer in your own words, and paste a real input with the output you were happy with.

  4. D

    Read the test run.

    Claude runs the skill once on your example and shows the output. Anything that breaks a rule gets fixed in the skill, not in the output. Say what is wrong and let it revise.

  5. E

    Download the zip.

    When you are happy, Claude gives you a zip named after the skill. Inside it is one folder with SKILL.md at the top. Save it somewhere you will find again.

Install

Into Claude

One upload, then it is on for every chat. You never have to name it: Claude reads the description and reaches for the skill when your request matches.

  1. 1

    Open Customize, then Skills.

    The same page as step B. Older layouts call it Settings, Capabilities, Skills.

  2. 2

    Press the plus and choose Create skill.

    Then upload the zip you downloaded.

  3. 3

    Check the toggle.

    Your skill appears in the list with its description. Make sure it is switched on.

  4. 4

    Run it on real work.

    Start a new chat. Do not name the skill. Type the request the way you would to a colleague, then paste this week's input. Claude should reach for the skill on its own.

  5. 5

    It did not trigger?

    Open the zip's SKILL.md and read the description line. It must say plainly when to use it, with the words you actually use. Ask Claude to rewrite it pushier, re-zip, upload again.

  6. 6

    Share it.

    Send the zip to a teammate; they upload it the same way. On a Team plan the workspace owner can add it for everyone from the admin settings, which is how the shared skills folder becomes real.

The loop

Write. Run. Improve. Run again.

Three passes in thirty minutes is a good result. A skill that has not been run on real work is a guess.

Things to say

  • It skipped the check step. Add it as a rule and show me the output again.
  • Too long. Cut it so it fits one screen.
  • Use my example instead of the stand-in one.
  • Rewrite the description so it triggers on "sort these expenses".

Common snags

  • Upload failed, or the skill does not appear: the zip must contain a folder with SKILL.md inside it, not SKILL.md loose at the top. Ask Claude to re-zip it that way.
  • Skills are greyed out: switch on Code execution and file creation under Settings, Capabilities. On a free plan, custom uploads may not be available; save the same four parts as a Project's instructions instead.
  • The description is too long: claude.ai keeps it under 200 characters. Ask Claude to trim it.
  • It triggers on everything: the description is too broad. Name the task and the input, not the whole job.
  • On Gemini or ChatGPT? The same four parts work as a Gem or a Project. The skill creator is Claude's; the method is yours.