What is WebMCP?

WebMCP is an evolving browser API proposal that allows websites to expose deliberately defined, application-specific tools to AI agents, enabling tasks such as retrieving account usage, searching documentation, or updating page state without relying on manual clicks and form navigation. Unlike the Model Context Protocol (MCP), which uses independent local or remote servers and JSON-RPC to provide tools, resources, and prompts across environments, WebMCP operates within a live web page, can use its authenticated state and interface context, and does not automatically create an MCP endpoint. Websites can register tools through JavaScript functions or annotate HTML forms, while retaining responsibility for validation, authorization, permissions, confirmation flows, and protection against unsafe output or data exposure. WebMCP is best suited to collaborative, in-page workflows where the current application state matters, whereas MCP remains appropriate for services and automated tasks that must function independently of an open browser tab; organizations may use both approaches for different interactions. As of September 2026, WebMCP remains experimental, with limited browser availability, so developers are advised to feature-detect support, preserve standard interfaces, begin with focused read-only tasks, and evaluate reliability, security, latency, and user outcomes before broader deployment.

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