Start with an invitation

You have an idea for a module and Claude Code on your computer, and you have never set up a development environment. You do not need to. Systaro sends you a link. You give that link to Claude Code, and about a minute later your first module runs in a test tenant of your own. From then on you tell Claude Code what the module should do, and every change shows in your browser by itself.

The setup speaks German for now. Write to Claude Code in the language you prefer.

1. Invitation

   A link from Systaro, valid for 14 days, usable once.

2. Hand it over

   Claude Code reads the link, installs the tools and sets up your access and your folder.

3. Test tenant

   Your browser opens your first module, signed in as administrator.

4. Describe

   Tell Claude Code what the module should do. It changes the package and installs it.

5. Look

   The open page shows the new version by itself. Tell Claude Code what you see.

From the invitation to your own module.

What you need

• Claude Code, installed and signed in (claude.com/claude-code)
• A computer with macOS, Linux or Windows
• Your invitation

You do not need Node.js, Git, an editor or administrator rights. Windows support is new: if the Windows line stops, send us the message it shows.

Start

1. Open Claude Code, in the terminal or in the Claude app.

2. Write this sentence with the link from your invitation:

   Richte mich mit dieser Einladung ein: https://<address>/public/module-dev/invite/nxi_yourcode

3. Claude Code reads the invitation page and asks whether it may run one line. Allow it. The line takes about a minute.

4. Your browser opens your test tenant on the page of your new module, called Mein erstes Modul. You are signed in as its administrator, and three sample records are already there. Leave the window open.

5. Start Claude Code again in the new folder Nexxus-Module in your home folder: in the terminal with cd ~/Nexxus-Module && claude, in the Claude app with a new session in that folder. When it asks “Trust this folder?”, answer Yes. Claude Code then asks what your module should do.

The link also opens in a browser. The page explains the same steps and, under “Lieber selbst im Terminal?”, shows the line for your system. Pasted into a terminal, that line does everything above and starts Claude Code in the new folder by itself.

What the line sets up

• .nexxus in your home folder: a Node.js of its own and the command line tool nxm. A Node.js you already have stays untouched.
• Nexxus-Module in your home folder: your first package, with the instructions and skills Claude Code works from.
• Your personal access, in the keychain of your computer. Where there is no keychain, it goes into a file only your account can read.
• Your test tenant on the instance that invited you.
• One line in your shell profile so that nxm is found. On Windows, an entry in your user Path.

You can run the line again at any time. It continues where it stopped.

Work with Claude Code

Say what you want to get, not how to build it. For example:

My entries should have a priority: low, medium or high. Show it in the list.

Claude Code changes the package and installs it into your test tenant. The page open in your browser shows the new version by itself, without a reload. It may change the files in your folder and run nxm without asking; for anything else it asks you first.

Claude Code does not see your browser. Tell it what you see, especially when something looks wrong. These sentences also work:

• “Open my test tenant.” You get a fresh sign-in in your browser.
• “Extend my test tenant by a week.”
• “Something went wrong when I clicked this button. Look at the log.”

Your test tenant

• It runs for 7 days and can be extended to 30 days after it was created. After that it is gone with everything in it. Your package stays in your folder, and Claude Code can set up a new tenant from it.
• You can have up to 5 test tenants at a time.
• It has no mail server and no AI provider, so it sends no mail and the AI Assistant does not answer there.
• It is for test data. Do not put real customer data in it.

Your work so far exists only on your computer and in the test tenant. When your module should reach a real tenant, talk to Systaro; the steps are on Package, install and update.

When something goes wrong

What you see	What to do
“Diese Einladung gilt nicht (mehr)” on the invitation page	The link was used, has expired or was withdrawn. Ask Systaro for a new invitation.
“Das hat nicht geklappt”	Run the same line again, or ask Claude Code to. It continues where it stopped.
“Dieser Einladungscode gilt nicht (mehr)”	The code was used, has expired or was replaced. Ask Systaro for a new invitation.
nxm is not found	Open a new terminal window. The old one does not know about it yet.
“Claude Code fehlt noch”	Install Claude Code, then run cd ~/Nexxus-Module && claude.
You changed computers	Ask Systaro for a new invitation. Your test tenant stays and the access on the old computer stops. Copy the Nexxus-Module folder over first, because the new setup creates a fresh first package.