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Codex

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Connect the ReUI MCP server to Codex and build UI from the ReUI registry by chat.

Codex connects to ReUI in one step: point its CLI at the hosted ReUI MCP server, sign in once, and start building UI from the ReUI registry by chat.

Connect ReUI

Add the ReUI server

Add the server with the Codex CLI:

Terminal
codex mcp add reui --url https://mcp.reui.io

Confirm the connection

Check that Codex registered the server:

Terminal
ClaudeCursor

On This Page

Connect ReUIInstall the ReUI skillBuild with ReUIUnlock premium itemsTroubleshooting
codex mcp list

You should see reui listed.

Sign in with ReUI

Authorize the connection with a browser sign-in:

Terminal
codex mcp login reui

This opens a "Sign in with ReUI" prompt in your browser. Approve it to connect. If you do not have a ReUI account yet, a free one is created for you right there in the flow, so there is nothing to set up in advance.

For headless or CI runs where no browser is available, create a personal token at reui.io/account/mcp and pass it as an Authorization: Bearer header.

Install the ReUI skill

Run the one-line installer so Codex follows ReUI's build workflow:

Terminal
curl -fsSL https://mcp.reui.io/install | node -

This drops a ReUI skill file into your project. With it in place, Codex knows how to discover blocks, assemble components, and wire them together the ReUI way instead of guessing.

Build with ReUI

Describe the interface you want in plain language and Codex pulls the right ReUI components, examples, and blocks from the registry, then wires them into your project.

Prompt
Use ReUI to scaffold an admin app - the app-shell with a collapsible sidebar and top bar, and a dashboard page with stat cards and a chart.
Prompt
Add a data-grid of orders with sorting, column filters, pagination, and row selection, wired to my /api/orders endpoint.
Prompt
Build a multi-step "create project" wizard with the ReUI stepper and form components, with validation on each step.
Prompt
Add a kanban board for support tickets with drag and drop, grouped by status, and a filters bar above it.

Unlock premium items

Free items (the 17 components and every c-* example) install with no license. To let Codex install premium blocks, icons, and templates too, grab a Pro or Ultimate license - one license unlocks the whole premium registry and removes the daily MCP request limit. Then add your key to the project - two quick steps:

Add your license key

Copy your key from Account → Licenses into .env.local at the project root:

.env.local
REUI_LICENSE_KEY=your-license-key-here

Add the @reui registry to components.json

components.json
{
  "registries": {
    "@reui": {
      "url": "https://reui.io/r/{style}/{name}.json",
      "headers": {
        "Authorization": "Bearer ${REUI_LICENSE_KEY}"
      }
    }
  }
}

That is it - Codex can now install any premium item the MCP returns, and free items keep working through the same config. See License Setup for the full guide, or compare plans on the Pricing page.

Troubleshooting

Almost every hiccup is a stale sign-in - the fix is to reconnect and authorize again.

  • Tools missing, greyed out, or "not connected" - the server did not finish connecting. To fix it, run codex mcp login reui, then restart Codex.
  • 401 or "authentication required" - your ReUI session expired. To fix it, run codex mcp login reui to sign in again.
  • Requests hang or the session drops mid-build - long sessions can lose the connection. To fix it, run codex mcp login reui and retry your last prompt.
  • 429 "daily limit reached" - you hit the free limit of 100 requests per day. Sign in with your ReUI license for unlimited access, or wait for the next day.
Plan scope

Free covers components and examples at 100 requests/day; a Pro or Ultimate license unlocks premium blocks, icons, and unlimited requests (add the @reui registry via License Setup to install them).