How to share context between ChatGPT, Claude and Cursor

You plan with ChatGPT, write with Claude and build in Cursor. Each is good at its part, and each knows about a third of your project. Switch tools and the first ten minutes go on explaining what the other two already heard: the brief, the audience, the price you settled on yesterday.

All three now have some kind of memory. None of it travels. That is the problem worth solving, and a longer prompt does not solve it.

Why the context stays where you left it

Each tool keeps what it knows inside itself:

• ChatGPT has its memory and its Projects. Both live in ChatGPT.
• Claude has its Projects, with their files and instructions. They live in Claude.
• Cursor reads rules and files from your repository: the right place for code, and the wrong place for the brief, the decisions and the research behind them.

So the context exists three times over, in three versions that drift apart. What you told ChatGPT on Monday never reaches Claude on Wednesday. If you already use Projects in either, here is how they compare with keeping the project outside both.

The usual workaround, and where it breaks

Most people end up with a context document: a brief or a notes file pasted into each tool at the start of a chat. It works for about a week.

• It goes stale. A decision made in one chat has to be copied into the document by hand, and usually is not.
• It grows. Pasted in full, it fills the window with parts that did not matter today.
• It only travels one way. What the tool writes back stays in that chat.

Copying every conversation into every tool would not help either. A chat history is mostly retries and rejected answers. The next tool needs what was decided and the work worth keeping, not forty messages of how you got there.

Keep the project in one place all three can read

In Seylo a project holds what it gathers: the pages and pictures you saved, notes, files, and the answers worth keeping, each with where it came from. Beside them sits In force, a short list of what the project has settled, one current value for each, with the older values kept underneath. That list is what a connected tool reads first.

Seylo speaks MCP, the open protocol ChatGPT, Claude and Cursor all use to reach other tools. So there is one project and one address, and every tool you connect works from the same version of it.

Connect each tool once

1. 1In Seylo, open Settings, then Connections, and copy the Seylo address.
2. 2In Claude, open Settings, then Connectors, and add a custom connector with that address.
3. 3In ChatGPT, turn on developer mode in Settings, under Apps & Connectors, then Advanced, and create a connector with the same address. Custom connectors need a paid ChatGPT plan.
4. 4In Cursor, open Cursor Settings, then MCP, and add a server with the same address.
5. 5Each tool sends you to Seylo once, to sign in and approve it. The connection renews itself after that.

Connecting an AI tool is part of Seylo Pro, which you can try free for seven days. The same address works in Manus and any other tool that takes one, and Connections also makes a token for a tool that cannot open a browser. What a connected tool can and cannot do.

What changes once all three read the same project

Say you are launching a small product. A morning across the three tools goes like this:

• In ChatGPT you settle the price at $12 a month and ask it to record that. The project's In force list now says $12.
• In Claude you ask for the landing page copy. It reads the project first, so the copy says $12 without being told, and it saves the copy back into the project as a draft, marked as made from the brief.
• In Cursor you build the pricing section. It reads the same copy and the same price from the project, not from something you pasted.

When one of them comes back with something that contradicts a settled fact, a different price say, it does not overwrite it. The suggestion waits in Review beside the value in force, and you decide. Anything the project did not know yet is simply recorded.

If you work in Cursor, put the habit in the repository

Cursor reads its rules file at the start of every session, and Claude Code and Codex do the same with theirs. Settings, then Connections, in Seylo has a short paragraph to paste into that file, with your project's name in it. With it there, the agent reads what is settled before it decides and records what it settles, without anyone remembering to ask.

The short version

• Each tool's memory stays inside that tool, so the project has to live somewhere outside all of them.
• Keep what is decided and what is worth keeping in one project, not in a chat history.
• Connect ChatGPT, Claude and Cursor to it once, with one address, and every chat starts from the same project.

To get answers into the project in the first place, see how to save ChatGPT and Claude answers before they get lost. For Claude on its own, giving Claude a memory of your project goes into more detail.