create-shorts-post-to-socials/ is a React + Vite playground that lets you pick a video from Dropbox, process it with Mosaic, then download the finished short – no backend required. View source on GitHub

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1 · What it does

  1. Lists Dropbox folders / files (filters video extensions)
  2. Uploads the selected file to Mosaic and runs an agent (Webinar, Talking-Head or free-form prompt)
  3. Polls run status every 5 s
  4. Shows <video> preview and download buttons for each output.

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2 · Environment variables (.env.local)

# Mosaic
VITE_MOSAIC_API_KEY=sk_…
VITE_MOSAIC_API_BASE=https://api.usemosaic.ai/api
VITE_WEBINAR_AGENT_ID=uuid-…         # optional
VITE_TALKINGHEAD_AGENT_ID=uuid-…     # optional

# Dropbox
VITE_DROPBOX_ACCESS_TOKEN=sl.B…      # scope: files.content.read
VITE_DROPBOX_FOLDER=/Videos          # optional – defaults to root

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3 · Install & run

cd create-shorts-post-to-socials
pnpm install          # or npm i
pnpm dev              # http://localhost:5173
# production
pnpm build && pnpm preview

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4 · User workflow

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5 · Customising

• Add real “post to socials” by wiring an OAuth token exchange after processing completes.
• Extend agent list – fetch from your MCP server’s list_agents tool or hard-code more IDs.
• All UI components are shadcn – run npx shadcn-ui@latest add button to scaffold additional primitives.