Cursor AI for Vibe Coding: the cursor you actually want
Every guide for this phrase assumes you mean Cursor the IDE and spends 1,500 words on how to prompt it better. This one starts from a different premise: the reason vibe coding feels clunky in any IDE is that the cursor is in the wrong place. It belongs inside the running app, not inside the file.
"Cursor AI for vibe coding" is a naming collision
Two different ideas share the word cursor. Cursor the editor is a VS Code fork that attaches a strong chat model to your files, and it is very good at what it does. The cursor you care about as a developer inside that editor is the text caret that blinks between characters. Vibe coding, the term Andrej Karpathy coined in early 2025, describes the opposite move: you describe what you want, let the model produce the code, and stop caring about the diff. The cursor that matters in vibe coding is not a text caret. It is a mouse cursor inside the app you are building.
If you came here typing "cursor ai for vibe coding" into Google, you probably meant one of two things. Either you want to use Cursor the IDE for vibe-style work and are looking for prompt tricks, or you want a tool that behaves like Cursor in spirit but for the vibe-coding paradigm. The top ten SERP results only answer the first reading. This page answers the second.
Cursor AI vs mk0r for the vibe-coding paradigm
| Feature | Cursor AI | mk0r |
|---|---|---|
| What you install | VS Code fork, Node.js, npm, local dev server | Nothing. Works in a browser tab. |
| Account required | Yes (email, sometimes card) | No. Start with a prompt, sign in later if you want to save. |
| Primary input | Keyboard into a chat box | Voice or text, plus direct mouse co-driving of the agent's tab |
| Where the agent runs | In your editor, touching local files | In a full Debian VM with Chromium, Playwright MCP, Vite, and VNC |
| Self-testing the output | Opt-in. You run and verify. | Automatic. Agent opens its own Chromium on :5173, checks DOM and console, fixes. |
| You can grab the cursor mid-build | No. You cannot click inside the agent's runtime. | Yes. /input WebSocket forwards your clicks into the same tab. |
| Undo scope | File-level or editor history | Git commit per turn. Revert or jump to any SHA. |
| Export | It was already your repo. | Standard Vite + React + TS project, downloadable. |
The cursor-sharing part, in actual source code
Here is the claim, in concrete terms, with file paths. When you open a mk0r VM session, a small Node process at /opt/proxy.js runs as the single externally exposed port (3000). It handles regular HTTP by forwarding to the Vite dev server on 5173, and it handles WebSocket upgrades by routing three special paths to dedicated relays. Those three paths are what turn a browser tab on your laptop into a shared workspace with the agent.
The crucial word is same. The screencast relay and the input relay both track the active page target over the browser-level CDP connection on port 9222 and automatically follow whichever tab Chromium is showing, including popup OAuth windows. So the mouse cursor you see on your screen and the mouse cursor the agent is watching are attached to the same DOM. When you click, the agent sees the click in the next snapshot it takes.
How a click travels from your laptop to the agent's tab
When the top search results say "use Cursor AI for vibe coding," the interaction model they describe is: type, read diff, accept, run, pray. The interaction model below is different. Your click is a network packet that lands inside the agent's running browser as an actual pointer event.
Shared-cursor data path
One click, start to finish
What is actually booted when you type the first prompt
Cursor AI for vibe coding asks a model to edit files you own. mk0r asks a model to operate a machine you rent for the session. The cost of a machine is boot time and orchestration; the return is that the agent can run, test, and demo what it just built, all without touching your laptop.
The friction math
accounts required to start
files to install on your laptop
VM boot from cached snapshot
Cursor the IDE is a download, an installer, a sign-in, and a local Node toolchain. mk0r is a URL.
When Cursor AI is the right answer, and when it is not
This is not a "Cursor is dead" page. For a serious codebase on your machine, Cursor remains an excellent choice and integrates in ways a hosted sandbox can't. The claim is narrower: for vibe coding specifically, the IDE form factor fights the paradigm. Here is how that splits up in practice.
Use Cursor AI when
You already have a repo, a local Node toolchain, and you want AI to help you edit a specific file or refactor a function. The cursor is in the right place: inside your code.
Use mk0r when
You are starting from an idea and do not want to install anything, name a project, or reason about files. You want the thing built and running in a browser while you describe it.
Both, in sequence
Vibe the first version in mk0r, export the project, open it in Cursor when you outgrow voice-and-pointing and want line-level edits.
Neither, honestly
For production auth, payments, or anything security-critical, neither a vibe session nor an AI editor is enough. Review line by line or have someone who can.
Demoing to non-coders
mk0r wins. You can hand the mouse to the person across the table and let them click inside the running app without opening a terminal.
If you want to try "vibe coding without the IDE"
The whole point of this approach is that there is nothing to set up. The one thing worth knowing is how to use the shared cursor, because that is the part that feels different from Cursor AI.
Vibe coding on mk0r, the one-minute version
Open mk0r.com and describe the app
Talk or type. The first prompt is the scope of the session. Be concrete about the user and the action, not the implementation.
Wait for the VM to boot (≈3s)
A pooled E2B snapshot revives with Chromium, Playwright MCP, and Vite already warm.
Watch the agent build through /screencast
Live CDP frames from the agent's Chromium tab. You see exactly what the agent sees, not a screenshot after the fact.
Grab the mouse inside its tab when you need to
Click in the live preview. Your click flows through /input, through CDP, and the agent sees the resulting DOM state on its next snapshot. Demonstrate instead of re-prompting.
Iterate one ask per turn, revert via git
Every turn is a commit. If an iteration goes sideways, jump back to a SHA instead of asking the agent to 'undo what you did.'
Want the shared-cursor part walked through live?
A 20-minute call: we open a session, you drive, we show how the /input WebSocket and the Claude agent share the same tab.
Or just try it without a call
No account. No install. Type a prompt and watch a real VM boot.
Start Vibe Coding →Frequently asked questions
Is Cursor AI actually good for vibe coding?
Cursor is a VS Code fork with a strong chat model attached to your files. It is an excellent AI code editor. 'Vibe coding' as Andrej Karpathy named it is closer to the opposite of editing code: you describe what you want and stop caring about the diff. Cursor gives you a great cursor in files. Vibe coding asks you to ignore files entirely.
What does 'the cursor you actually want' mean?
For real vibe coding you want a cursor inside the running app, not a cursor blinking in a file. That way when the agent builds something slightly off, you can just grab the mouse and click the button you meant. mk0r gives you that. Every mk0r VM exposes an /input WebSocket that injects your mouse and keyboard events directly into the same Chromium tab the Claude agent is driving, over Chrome DevTools Protocol.
Where is this '/input' endpoint in the code?
In docker/e2b/files/opt/proxy.js, the HTTP upgrade handler routes /screencast, /input, and /vnc to dedicated relays. The /screencast handler connects to CDP on port 9222 and streams Page.screencastFrame frames to your browser. The /input handler takes the same tab target and forwards Input.dispatchMouseEvent and Input.dispatchKeyEvent calls from your clicks. You are looking at lines 50 through 81 of that file.
Do I need Cursor, VS Code, Node.js, or anything installed?
No. mk0r runs entirely in your browser. The VM is an E2B sandbox with Chromium, Xvfb, x11vnc, websockify, Playwright MCP, a Vite dev server, and the Claude ACP bridge already baked into the template image. You hit mk0r.com, type a prompt, and there is no install step. Cursor for vibe coding requires a full local dev environment including Node, npm, and a VS Code fork.
What services run inside the VM while I vibe code?
Behind a single reverse proxy on port 3000: Vite dev server on 5173, Playwright MCP on 3001, Claude ACP bridge on 3002, CDP exposed on 9222, VNC over WebSocket on 5901, and a Bright Data residential upstream proxy on 3003 for outbound traffic. Startup script is /opt/startup.sh; the reverse proxy is /opt/proxy.js.
So is 'Cursor AI for vibe coding' a wrong search?
Not wrong, just narrow. If you already live in an IDE and want AI inside it, Cursor is a strong pick. If you are vibe coding in the Karpathy sense, where you describe and demonstrate rather than edit, an IDE is the wrong venue and a shared browser is the right one.
Can I get the code out of mk0r?
Yes. mk0r generates a normal Vite plus React plus TypeScript project at /app inside the VM. Every turn is a git commit. You can revert, jump to any SHA, and pull the project out to keep iterating in your own editor, including Cursor if you want.
Does the agent also test the app in its browser, or does it just build?
It tests. The Claude agent controls the same Chromium instance through Playwright MCP: it navigates to localhost:5173, reads the DOM, inspects the console, clicks around, and fixes errors it finds before reporting a turn complete. You watch this happen live through the /screencast WebSocket.