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Marketplace Build Component Agent Skill

by vercel-labs

Builds UI components using the Blok design system for Sitecore Marketplace apps. Use when the user wants to create UI, add components, build a page layout, or work with Blok/shadcn components in a marketplace app.

2k tokens
context cost
the whole folder, loaded on every use
2
files
instructions only
0
copies elsewhere
how many repositories repackaged it
3
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/vercel-labs/sitecore-skills --skill marketplace-build-component

What comes with it

4 692 bytes besides the instruction
references/blok-components.md

The instruction itself

11 sections, as written by the author

Build UI with Blok Design System

You are helping the user build UI components for a Sitecore Marketplace app using the Blok design system (Sitecore's shadcn-based component library).

Key Principles

  • Always use Blok components — they match the Sitecore host UI and support light/dark themes automatically
  • SDK data integration — use loading states (Skeleton) and error states (Alert) when fetching SDK data
  • Extension point awareness — different extension types have different UI constraints (see below)
  • Responsive — components render inside iframes of varying sizes

Installing Components

Blok components are installed via the shadcn CLI:

# Install the Blok theme (required first)
npx shadcn@latest add https://marketplace-sdk.sitecorecloud.io/r/blok-theme.json

# Install individual components
npx shadcn@latest add https://marketplace-sdk.sitecorecloud.io/r/<component-name>.json

See blok-components.md for the full component catalog with install commands.

UI Patterns by Extension Type

Compact Field (custom-field)

  • Very limited space (~300px wide, variable height)
  • Use: Input, Select, Badge, small inline components
  • Avoid: Tables, large layouts, modals

Dashboard Widget

  • Medium space (~400x300px default, resizable)
  • Use: Cards, Charts, Stats, compact Tables
  • Good for: Summary data, quick actions

Pages Context Panel

  • Side panel (~350px wide, full height)
  • Use: Vertical layouts, Lists, Accordion, Tabs
  • Good for: Contextual info about current page, actions

Fullscreen

  • Full viewport within the Sitecore shell
  • Use: Any components, complex layouts, Tables, Forms
  • Good for: Full CRUD interfaces, dashboards, settings

Standalone

  • Independent page, not in Sitecore shell
  • Use: Any components, full creative freedom
  • Good for: Public-facing pages, OAuth callbacks

SDK Data Integration Pattern

"use client";

import { useEffect, useState } from "react";
import { useMarketplaceClient, useAppContext } from "@/components/providers/marketplace";
import { Skeleton } from "@/components/ui/skeleton";
import { Alert, AlertDescription } from "@/components/ui/alert";

export function MyComponent() {
  const { client } = useMarketplaceClient();
  const appContext = useAppContext();
  const [error, setError] = useState<string | null>(null);

  const loading = !appContext;

  if (loading) return <Skeleton className="h-32 w-full" />;
  if (error) return <Alert variant="destructive"><AlertDescription>{error}</AlertDescription></Alert>;

  return <div>{/* Render data */}</div>;
}

Reference Files

  • Blok Components — Full component catalog with install commands

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How to use it

Copy the folder

Take vercel-labs/marketplace-build-component from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.

Install what it needs

The instructions reference npx. Without those the skill loads but fails at the first command.