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First reported by Product Hunt
WebMCP: JavaScript Interface for AI Agents to Access Web Application Functionality

WebMCP API: JavaScript Interface for Exposing Web Apps as AI Tools

By

Alifatisk

3mo ago· 11 min readenNews

Summary

WebMCP API is a new JavaScript interface that enables web developers to expose web application functionality as 'tools' - JavaScript functions with natural language descriptions and structured schemas. These tools can be invoked by AI agents, browser agents, and assistive technologies. Web pages using WebMCP essentially function as Model Context Protocol (MCP) servers that implement tools in client-side scripts rather than on the backend. The technology facilitates collaborative workflows where users and AI agents work together within the same web interface, leveraging existing application logic while maintaining shared context and user control.

Key quotes

· 3 pulled
WebMCP API is a new JavaScript interface that allows web developers to expose their web application functionality as 'tools' - JavaScript functions with natural language descriptions and structured schemas that can be invoked by agents, browser's agents, and assistive technologies.
Web pages that use WebMCP can be thought of as Model Context Protocol [MCP] servers that implement tools in client-side script instead of on the backend.
WebMCP enables collaborative workflows where users and agents work together within the same web interface, leveraging existing application logic while maintaining shared context and user control.
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WebMCP API is a new JavaScript interface that allows web developers to expose their web application functionality as “tools” - JavaScript functions with natural language descriptions and structured schemas that can be invoked by agents, browser’s agents,

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