You spent months teaching a custom GPT how your business works. This rebuilds all of that into a single file that opens in Claude and goes wherever you go.
On August 16, 2026, personal ChatGPT accounts lost the ability to create new custom GPTs. Free, Go, Plus and Pro. Building a new one, or publishing to the GPT Store, now needs a Business, Enterprise or Edu workspace.
The ones you already built still work. You can still open them and still edit them, and no shut-off date has been announced. So there is nothing to rush and nothing to rescue.
What did change is where the next one gets built. Going forward that's a skill, and a skill is one file that loads into Claude and travels with you. The months you already spent teaching a GPT your business can come along.
Copying instructions from one place to another carries the mess along with the good parts. The duplicated paragraph, the rule you wrote twice, the file you meant to upload and never did. This reads what you wrote and rebuilds it, and it tells you what it found on the way.
The thinking you put in is still good. Rebuilt as a skill, it sits in the place you already work instead of behind one more login.
It converts one, shows you the result, and stops so you can check it before it touches the rest. You get one file per assistant.
Months of quick edits leave repeats and dead paragraphs. It points at the specific lines instead of telling you it feels bloated.
Point it at one you built before. It checks the same things and tells you what to fix, no rebuild required.
Free. One file, nothing to sign up for. Download it and leave it zipped, then upload it to Claude the same way you would any skill.
New to Claude skills? Watch how to install it. Takes under 2 minutes.
Doing several? Give it one at a time. It stops after the first one on purpose so you can check the result before the rest go through.
A rebuilt skill knows what your old GPT knew. It doesn't know the things you never wrote down, and those are usually the ones that matter: your prices, your customer, the way you say no. 20 minutes here is the difference between a skill you reach for every week and one you forget you installed.
And you don't need to be technical for any of it. A skill is just a set of instructions saved in a file called SKILL.md, and you change those instructions by talking to Claude in plain English. Claude does the typing.
Every skill lives in a folder on your computer, inside one called .claude/skills. Before you change anything, make a copy of that folder somewhere safe, because when the skill's maker releases an update, it overwrites the original and takes your edits with it, with no warning. If you're not sure where the folder is, ask Claude, "where is this skill saved on my computer?" and it will tell you.
This prompt tunes the Skill Rebuilder itself, so every assistant you feed it comes back sounding like your business instead of generic.
I want to customize the Skill Rebuilder skill so it rebuilds my assistants the way my business works. Here is my business: [what you do and who you serve]. The assistants I'm moving over do this: [list them, for example: writes my Instagram captions, answers client emails, prices my packages]. My brand voice is [describe it, for example: warm but direct, plain language, no jargon]. Rules I never want dropped: [the do-nots, for example: never use em dashes, never quote a price under $500, never write in third person]. The documents I usually upload are [for example: my pricing sheet, my brand guide, past client emails]. I'll be using these in [Claude app, Claude Code, or both]. When you rebuild an assistant for me, always keep my rules word for word, name the file after the job it does, and tell me in plain English what you changed and what you left out. Keep the section at the very top between the dashes exactly as it is, and show me what you changed.
What to tell it about each assistant you move