mcp-handler adds experimental WebMCP support, enabling MCP tool usage in browser agents

·2026.09.18 09:00

Key point

mcp-handler has added experimental support for WebMCP, allowing browser agents to call existing MCP tools with authentication.

Details

mcp-handler has introduced experimental support for WebMCP. WebMCP is a proposed web standard for exposing tools to in-browser agents.

To use existing MCP tools in the browser, enable the tools on the site via the experimental_webMcp object and load the script from the MCP endpoint using the ?webmcp-script parameter. This script registers the tools on the page and proxies each call to the MCP server with the logged-in user's permissions.

This approach allows the use of authenticated tools without a browser-side OAuth flow. To use this feature, you must upgrade to [email protected].

mcp browser-agent webmcp mcp-handler web-standard

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