---
title: "Rebuild Your AI System This Weekend So Any Tool Can Plug In"
author: "Ecem Karaman"
source: "https://aiwithecem.com/guides/weekend-ai-system"
published: 2026-09-19
tools: ["ChatGPT","Claude","Multi-Tool"]
topics: ["Second Brain","Setup","Workflows"]
---

# Rebuild Your AI System This Weekend So Any Tool Can Plug In

Most AI setups live inside one app's memory and settings. That's fine until you add a second tool and start over, or the app changes and your context goes with it. This weekend, you'll move your system into a folder you own. Claude and ChatGPT both read it, and any tool you add later plugs in with one line. It takes about two hours, split across two days.

**Details checked against [Claude's Cowork guide](https://support.claude.com/en/articles/13345190-get-started-with-claude-cowork) and [ChatGPT's projects docs](https://learn.chatgpt.com/docs/projects) on September 19, 2026.**

> **In this guide**
>
> 1. [Saturday morning: build the core](#saturday-morning-build-the-core)
> 2. [Saturday afternoon: fill it with the real you](#saturday-afternoon-fill-it-with-the-real-you)
> 3. [Sunday morning: plug in Claude and ChatGPT](#sunday-morning-plug-in-claude-and-chatgpt)
> 4. [Sunday afternoon: habits and rules](#sunday-afternoon-habits-and-rules)
> 5. [Plugging in the next tool](#plugging-in-the-next-tool)
> 6. [Done by Sunday night](#done-by-sunday-night)

## Saturday morning: build the core

**45 minutes.** Create this folder anywhere you back up:

```text
ai-home/
├── START-HERE.md       who you are, how you work, what's where
├── now.md              current priorities and open loops
├── decisions.md        choices already made, and why
├── voice/samples.md    3-5 pieces of your real writing
├── projects/<name>/    one brief per project
├── inbox/              drop anything, sort weekly
└── archive/
```

**The key design choice:** one `START-HERE.md` that every tool reads first. Tools are plugs. The folder is the system.

Don't write the files from a blank page. Open the folder in Claude or ChatGPT and let it interview you:

```text
Interview me to set up my ai-home folder. Ask one question at a time, 12 questions max, covering my role, current goals, how I like answers formatted, decisions I've already made, and what you should never do. Then write START-HERE.md, now.md and decisions.md in this folder. Keep START-HERE.md under one page, and show me each file before saving it.
```

## Saturday afternoon: fill it with the real you

**30 minutes.**

- **`voice/samples.md`:** paste 3 to 5 pieces of your real writing. Real samples beat any description of your tone.
- **`decisions.md`:** add the choices AI keeps reopening, like your tools, your format and your "no."
- **`projects/`:** write one short brief for each active project: goal, audience, constraints, and where things stand.

## Sunday morning: plug in Claude and ChatGPT

**30 minutes.**

**Claude:** use Cowork in the Claude desktop app, which local folders require. It's on Pro, Max, Team and Enterprise.
1. Start a task and select `ai-home`. Grant access when asked.
2. Add **folder instructions:** `Read START-HERE.md before any task. Update now.md and decisions.md when something changes, and show me the change first.`

On some Pro and Max accounts, Cowork is merged into regular Claude, so you just describe the task.

**ChatGPT:** use the desktop app. A web project can't reach local folders.
1. Create a local project → **Edit project** → **Add folder** → select `ai-home` → **Make primary**.
2. Start each chat with the opener below.

**The universal opener:**

```text
Read START-HERE.md and now.md in ai-home before we start. Then: [task]
```

**Test it:** give both tools the same real task and compare the answers. If either one ignores your preferences, tighten `START-HERE.md`.

## Sunday afternoon: habits and rules

**20 minutes.**

**Three habits:**
1. Start with the opener, or rely on folder instructions.
2. End each session with: `What changed that belongs in now.md or decisions.md? Show me the edits before saving.`
3. Drop anything useful into `inbox/`, and let AI sort it weekly.

**Rules:**
- No passwords, ID numbers, health details or other people's private information.
- Separate work and personal folders if your employer's AI policy requires it.
- Review what AI saves, and back up with cloud sync or Git.
- Prune regularly. The [weekly context audit](/guides/weekly-context-audit) takes 10 minutes.

## Plugging in the next tool

| The new tool can... | How to plug it in |
| ------------------- | ----------------- |
| Open a local folder | Point it at `ai-home` and add the opener as its instructions |
| Only accept uploads or instructions | Paste `START-HERE.md` into its custom instructions or project |
| Read instruction files, like coding agents | Have its file point to `START-HERE.md`. See [Stop Building Your AI System Inside One Tool](/guides/tool-agnostic-ai-system) |

Either way, the new tool gets a way in. The system itself stays the same.

## Done by Sunday night

- [ ] `ai-home` exists and is backed up
- [ ] `START-HERE.md` fits on one page
- [ ] Voice samples, decisions and project briefs are in
- [ ] Claude and ChatGPT both passed the same-task test
- [ ] The end-of-session update habit is on a sticky note

**Go deeper:** [ChatGPT's Memory Lives in Five Places](/guides/chatgpt-memory) · [Stop Building Your AI System Inside One Tool](/guides/tool-agnostic-ai-system) · [How I Use AI to Index My Brain](/guides/ai-brain-warehouse)