Owl Browser is a self-hosted browser automation engine built on Chromium with a custom C99 HTTP server designed specifically for AI agents. It replaces screenshot-heavy agent loops with Agent Rendering, converting pages into compact, handle-addressable OwlMark text that reduces token usage significantly. The tool includes source-level fingerprint spoofing, built-in CAPTCHA solving, Tor integration, and support for up to 256 parallel isolated browser contexts. Developers can integrate via Python and TypeScript SDKs, a REST API, or MCP protocol for direct AI agent connectivity.