opencode-claude-code-provider

An OpenCode plugin that registers Claude Code (Agent SDK) as a provider, allowing users to use their existing claude login subscription without API keys.

Features

• No API Key Required: Uses your existing Claude Code CLI authentication (claude login)
• Flat-Rate Pricing: Costs are zeroed out since you're using your subscription
• Three Models Available:
  • claude-code/sonnet - Fast and capable
  • claude-code/opus - Most powerful
  • claude-code/haiku - Fastest, most cost-effective
• Built-in Tool: Includes claude-code-query tool for explicit Agent SDK calls

Prerequisites

1. You must have Claude Code CLI installed and authenticated:

   npm install -g @anthropic-ai/claude-code
   claude login

2. OpenCode must be installed (the plugin will be loaded by OpenCode)

Installation

Method 1: Symlink for Development

# Clone the repository
git clone <repository-url>
cd opencode-claude-code-provider

# Install dependencies
bun install

# Build the plugin
bun run build

# Symlink to OpenCode plugins directory
ln -s $(pwd) ~/.config/opencode/plugins/opencode-claude-code-provider

Method 2: Copy to Plugins Directory

# Build the plugin
bun run build

# Copy to OpenCode plugins directory
cp -r dist ~/.config/opencode/plugins/opencode-claude-code-provider

Usage

Once installed, OpenCode will automatically detect the plugin. You can select Claude Code models in your OpenCode configuration:

{
  "model": "claude-code/sonnet"
}

Or use the explicit query tool:

{
  "tool": "claude-code-query",
  "args": {
    "model": "opus",
    "prompt": "Your prompt here"
  }
}

How It Works

This plugin uses:

• ai-sdk-provider-claude-code - Wraps the Claude Agent SDK for Vercel AI SDK compatibility
• @anthropic-ai/claude-agent-sdk - The official Claude Code SDK

The plugin registers claude-code as a provider and zeros out cost tracking since you're using your flat-rate Claude Code subscription rather than per-token API pricing.

Development

# Install dependencies
bun install

# Build
bun run build

# Watch mode for development
bun run dev

License

MIT