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Developer Runs AI Agent Directly Inside Browser Tab Using Pyodide and Ollama

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A developer has demonstrated a working experiment that runs an AI agent loop inside a browser tab, rather than through the conventional approach of external browser automation tools like Playwright. The setup uses Pyodide, which compiles CPython to WebAssembly, allowing Python code to run natively in the browser and access the page's DOM and network directly. A local language model, Ollama, serves as the reasoning backend, while the in-tab Python agent handles perception and action through a set of named tools such as read_dom and click_element. The tool layer is inspired by the Model Context Protocol's pattern of structured JSON tool calls, though the author clarifies it is not a full MCP protocol implementation. The approach aims to eliminate the session-sync bugs and latency that arise when an agent operates on a separate, synthetic copy of the browser rather than the live page itself.

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