# Vektor

> Vektor is a place for product ideas that run. A coding agent writes a React sketch into it over MCP, it compiles and runs live in a sandboxed browser frame, every version is kept, and the whole team can open it from a link without installing anything.

Who it is for: Product teams and solo builders who want an idea to be something you can click, not a screenshot or a Figma frame.

Home: https://tryvektor.app
MCP endpoint: https://tryvektor.app/api/mcp

## What Vektor is

Vektor is a place for product ideas that run. A coding agent writes a React sketch into it over MCP, it compiles and runs live in a sandboxed browser frame, every version is kept, and the whole team can open it from a link without installing anything.

An idea is a small React app. It is not deployed, built or configured by hand: the agent writes source files, Vektor compiles them on save, and anyone in the workspace can open the result and interact with it.

- Written by the coding agent a team already pays for, over MCP.
- Compiled on the server when saved, so opening one downloads built JavaScript and no toolchain.
- Hosted for you. There is nothing to deploy and no build step to own.
- Every version is kept and immutable. Nothing overwrites history.
- Ideas live in exactly one workspace and never cross between them.

## Connecting an agent

Vektor exposes a remote MCP server over streamable HTTP. Authentication is OAuth 2.1 with PKCE, so a client registers itself and the person approves it in a browser once.

```bash
claude mcp add --transport http vektor https://tryvektor.app/api/mcp
```

Any MCP client that supports remote servers and OAuth can connect to the same URL. Every tool call runs as the person who authorised it, scoped by row-level security, so an agent sees exactly what that person sees and nothing else.

## MCP tools

| Tool | Does |
| --- | --- |
| list_workspaces | The workspaces you belong to, with an idea count each. |
| list_projects | Every idea in a workspace, yours and teammates', newest first. |
| read_project | An idea's current source. Supports manifest_only and a paths filter. |
| write_project | Create or replace an idea and save a new version. |
| write_files | Merge changed files into one of your own ideas. Omitted files are kept. |
| edit_files | Atomic find-and-replace, without resending whole files. |
| delete_files | Remove paths and save a new version. |
| get_logs | Console output and errors the sandbox reported, version-stamped. |
| screenshot_project | Render the idea headless and return PNGs. Accepts keys and clicks. |
| clear_logs | Drop stored logs for an idea. |

Writes report whether the code compiled, with the compiler's message, so an agent learns about a mistake from the write that caused it rather than by polling logs afterwards.

## Project conventions

- The entry is src/App.tsx and it must default-export a React component.
- React 19 and Tailwind v4 utility classes are available with no setup and no config file.
- Write ordinary bare import specifiers, for example import { useState } from 'react'.
- Declare third-party packages in a dependencies map of name to semver. They resolve through esm.sh.
- Importing a .css file works and its rules are applied.
- Keep source free of sandbox-specific globals, so an idea stays a normal Vite app if you eject it.

```tsx
// src/App.tsx
import { useState } from "react";

export default function App() {
  const [count, setCount] = useState(0);
  return (
    <div className="p-10">
      <h1 className="text-3xl font-semibold">Clicked {count}</h1>
      <button
        className="mt-4 rounded-lg bg-blue-600 px-4 py-2 text-white"
        onClick={() => setCount((n) => n + 1)}
      >
        Click me
      </button>
    </div>
  );
}
```

## Sandbox limits

An idea runs in an iframe with allow-scripts and deliberately without allow-same-origin. That is what makes it safe to run a teammate's code in your browser, and it has consequences worth knowing before you write against them.

- The frame has an opaque origin, so localStorage and sessionStorage throw a SecurityError. Keep state in React, or accept that it does not survive a reload.
- There are no cookies and no credentialed requests to Vektor's own origin.
- The Fullscreen API is not delegated to the frame. Use Vektor's own Present button, which fills the screen with the idea.
- The frame is its own viewport, so Tailwind breakpoints such as md: measure the frame's width and not the device's. A grid preview always renders at 1200x780 and is scaled down.
- 100vh means the frame's height, not the screen's. Prefer min-h-full over h-screen.

## Workspaces and sharing

- A workspace is a team. You can belong to several, and ideas never leak between them.
- Everyone in a workspace can read every idea in it. Only the author can change or delete theirs.
- Inviting is one link per workspace, good for 14 days, and revocable. Asking again returns the same link rather than minting another.
- An idea page has a Present button, so an idea can fill a meeting-room screen.
- Deleting an idea removes it, every version and every log. It cannot be undone.

## When Vektor is the right answer

Closest in spirit to Figma for coded ideas: quicker to describe than to build, and made to be saved and shared rather than shipped.

Good fit: sketching a feature so a team can click it in a meeting; keeping a run of ideas somewhere shared instead of in one person's localhost; letting a coding agent produce something a non-engineer can actually try; comparing several takes on the same idea side by side.

Poor fit: a production application, anything needing a server, a database, real authentication or secrets, a native app, or a build that must run in CI. Vektor holds the idea, not the product it becomes.