The OpenCode Browser plugin provides browser automation capabilities through direct connections to the Chrome DevTools Protocol (CDP). It exposes a set of tools (browser_list, browser_navigate, browser_snapshot, browser_click, browser_fill, browser_eval, browser_screenshot) that allow an AI agent to control a browser by specifying the browser's debugging endpoint (browser_url) and optionally a target ID. The plugin consists of three main parts: the plugin interface (src/plugin.ts), a lightweight CDP client over WebSocket (src/lib/cdp.ts), and accessibility tree snapshot utilities with unique element IDs for interaction (src/lib/snapshot.ts). The CDP client handles connection, message exchange, and event handling, while the snapshot utility processes the accessibility tree to generate a tree of nodes with stable UIDs for use in click and fill operations.