OAuth vs API Keys: How Memory Tools Connect to Claude, ChatGPT, and Everything Else

You found a memory tool with great search and a clean dashboard. You go to connect it to Claude, and there is no way to. No "Connect" button works, or the one you find asks you to paste a long secret string. Almost every time, the reason is the same: how the tool handles login.

This trips up a lot of people, so it is worth understanding once. It also helps you choose quickly, because the way a tool handles login tells you which AI apps it can connect to, and how safe your connection is once you do.

For the bigger picture of how tools connect at all, see What Is MCP?. For where this fits among the products, see Best AI Memory Tools in 2026.

Two ways AI apps connect to outside tools

Consumer apps like Claude and ChatGPT connect to outside tools through a flow you have used a hundred times elsewhere. You click connect, a consent screen appears, you approve, and you get access you can revoke later for that one app without touching the others. That flow is built on OAuth. The apps can even register themselves automatically, so you are not hand-editing config files. When an app supports this, it is the cleanest option: nothing to copy, a clear approval step, and a revoke button.

Other apps, often code editors and command-line tools, do not offer that flow. They expect you to paste a token into a settings file instead. The app then uses that token to identify itself. This is normal and fine for tools on your own machine.

So the first thing login style decides is which apps can connect. An app that speaks the click-and-consent flow can connect that way. An app that only takes a pasted token connects that way. A good memory tool supports both, so it works with the apps that have a Connect button and the ones that do not.

A token is fine. A key in a URL is not.

Here is the part that actually matters for safety, and it is easy to miss.

There is a real difference between pasting a token into a settings file and putting a key directly in the web address of the server. Some tools take the second shortcut: your secret key rides along inside the URL. That is worse, for reasons that have nothing to do with which apps you can reach:

• Servers and the systems in front of them often record full web addresses in their logs.
• Browser history and the "where did you come from" header passed between sites can carry that address along.
• The moment you share your screen or paste the link into a support ticket, the key goes with it.

A token kept in a settings file stays put. A key in a URL leaks into places you never see. So there are three options here, from worst to best: a key in a URL, a token in a settings file, and a click-and-consent connection with a revoke button.

What this means when you are choosing

You do not need to memorize any of this. Two questions do the work:

Can I connect this tool to the apps I actually use, whether they have a Connect button or only take a pasted token? And when I do paste a token, does it stay in a settings file, or does it end up in the URL? The answers tell you whether the tool reaches your apps and whether your secret travels somewhere it should not.

How Skein handles it

For apps that support the click-and-consent flow, Skein connects that way: approve once, manage the connection in your settings, turn it off whenever you want.

For apps that do not, like some code editors and command-line tools, Skein gives you a connection token you paste into the app's settings, never in the URL. It is not a single all-powerful password, and it keeps the convenience of a token without the usual downsides.

Both kinds of connection stay under your control

The login style decides how an app connects. What you can do about a connection afterward is the same either way, and it is the part that keeps you safe once several tools can reach your memory.

Every connection, whether it came in through click-and-consent or a pasted token, is its own thing you can manage on its own:

• Scope it narrowly. You choose what each connection can read and what it can write. A tool that only needs to look things up never gets permission to change anything. One connection's reach has nothing to do with another's.
• See what it has done. Each connection records when it reached your memory, so you can look at what a given tool has actually been doing rather than hoping it is fine.
• Revoke it on its own. Turn off one connection and the rest keep working. A token can also be set to expire on its own. Nothing is all-or-nothing.

That combination is the point. A clean login gets you connected, but scope, audit, and revoke are what let you connect several tools without losing track of who can touch what.

What sets memory tools apart after that is the same as ever: how easily you can move your data out, and how well search works across everything you have stored. Skein also keeps separate spaces for work and personal memory, and checks every capture for secrets like API keys, holding anything it finds aside so it never spreads into your searchable memory until you have looked at it. For sharing one space with someone else, see Sharing a Namespace in Skein.