Step 2: Install prototype-kit

prototype-kit is a Gemini CLI extension maintained by Agentic Engineering Agency. It adds the /prototype-from-docs command to the agent and configures it to scaffold React + Vite + shadcn/ui projects.

Install via Gemini CLI extensions

# macOS / Linux
gemini extensions install --consent https://github.com/Agentic-Engineering-Agency/prototype-kit

# Windows PowerShell
gemini extensions install --consent https://github.com/Agentic-Engineering-Agency/prototype-kit

The --consent flag skips the interactive confirmation prompt. Without it, the install silently no-ops when stdin is piped (e.g., in a script). The agent will download the extension and register it automatically. You should see:

Extension 'prototype-kit' installed successfully.

Verify the extension is registered

# macOS / Linux
gemini extensions list

# Windows PowerShell
gemini extensions list

Expected output includes:

prototype-kit  v0.x.x  Agentic Engineering Agency

Confirm the install on disk

gemini extensions list only renders inside an interactive gemini session. If you want a scriptable check, list the directory directly:

# macOS / Linux
ls ~/.gemini/extensions/prototype-kit/gemini-extension.json

# Windows PowerShell
Get-Item $HOME\.gemini\extensions\prototype-kit\gemini-extension.json

A file listing means the install succeeded. "No such file" means it didn't — re-run the install command with the --consent flag.

Manual fallback (behind a proxy or air-gapped)

If the GitHub URL install fails on your network (corporate proxy, captive portal, etc.), clone the repo and run the bundled installer:

git clone https://github.com/Agentic-Engineering-Agency/prototype-kit.git
cd prototype-kit
node bin/install.js

The installer detects Gemini CLI, Claude Code, and OpenCode on your PATH and writes their respective configs.