Getting Started

Open Builder is an open source web interface for Claude Code that lets you interact with Claude AI directly in the browser through a permission-controlled UI. It handles session management and exposes Claude's coding capabilities—reading, editing, and running code—via a clean web front end, making it useful for teams that want Claude-powered development assistance without installing the CLI. Available as an open web service in Eyevinn Open Source Cloud, Open Builder is ready to use with your own Anthropic API key. This tutorial walks you through the steps to get started.

Prerequisites

Step 1: Store your Anthropic API key as a secret

It is good practice to store credentials as secrets and reference them when creating an instance. Navigate to the Open Builder service in Eyevinn Open Source Cloud web console. Go to the tab "Service Secrets" and click on "New Secret".

Create the following secret:

  • anthropic_key with your Anthropic API key (e.g. sk-ant-api03-...)

Step 2: Create the Open Builder instance

Go to the tab "My open-builders" and click on "Create open-builder". Fill in:

  • Name: a name for your instance (alphanumeric and underscores only)
  • AnthropicApiKey: {{secrets.anthropic_key}}
  • OscAccessToken (optional): your OSC personal access token if you want the Claude agent to manage OSC services on your behalf

Click on the instance card when the status is green and "running".

Step 3: Open the web interface

Click the instance URL to open Open Builder in your browser. You can start a conversation with Claude directly—ask it to read files, write code, or run shell commands within the sandboxed environment.

CLI usage

osc create eyevinn-open-builder mybuilder \
  -o AnthropicApiKey="sk-ant-api03-..."

Resources