opencode-anthropic-websearch

An OpenCode plugin for Anthropic web search with citations.

Features

• Uses Anthropic's native web_search_20250305 tool
• Supports both API key and OAuth authentication
• Automatically refreshes OAuth tokens when expired
• Formats responses with numbered citations and sources

Installation

bun install opencode-anthropic-websearch

Or for local development:

git clone <repo>
cd opencode-anthropic-websearch
bun install
bun run build

Configuration

Add the plugin to your ~/.config/opencode/opencode.json:

{
  "plugins": [
    "file:///path/to/opencode-anthropic-websearch"
  ]
}

Usage

Once configured, the anthropic_web_search tool is automatically available to the LLM. It will be used when Claude needs to search the web for current information.

Example

The LLM can call the tool with a query:

anthropic_web_search({ query: "latest news about AI developments" })

The response includes the search results with numbered citations:

According to recent reports, AI developments have accelerated... [1][2]

---
**Sources:**
[1] Article Title: https://example.com/article1
[2] Another Article: https://example.com/article2

Authentication

The plugin supports two authentication methods:

1. API Key: Use your Anthropic API key
2. OAuth: Use Claude Pro/Max subscription via OAuth (automatically refreshes tokens)

Authenticate via opencode auth login and select your preferred method.

Development

# Install dependencies
bun install

# Type check
bun run typecheck

# Build
bun run build

License

MIT