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WebMCP is a proposed JavaScript API specification that enables web applications to expose their functionality as "tools" that can be invoked by AI agents, browser agents, and assistive technologies. It extends the Navigator interface with a ModelContext API, allowing developers to register JavaScript functions with natural language descriptions and JSON schemas. The specification defines how web pages can act as Model Context Protocol servers on the client side, enabling collaborative workflows where users and agents interact within the same web interface while maintaining shared context and user control.