webmcp-types.
Cross-package concepts stay in Explanation; task-oriented setup stays in
Tutorials and How-To Guides.
Core runtime
@mcp-b/webmcp-polyfill
Tool registration and discovery polyfill for browsers without a compatible
document.modelContext implementation.@mcp-b/global
Full MCP-B runtime entry point that layers transport and extension APIs on top of the WebMCP
surface.
@mcp-b/webmcp-ts-sdk
Browser adapter that provides
BrowserMcpServer, MCP-B extensions, and schema helpers.@mcp-b/transports
Tab, iframe, and extension transport classes for moving MCP messages through browser boundaries.
@mcp-b/mcp-iframe
Custom element that exposes tools, prompts, and resources from an iframe to its parent page.
React
usewebmcp
React hook for registering document.modelContext tools without the broader MCP-B runtime layer.
@mcp-b/react-webmcp
Full React integration for MCP-B, including tool hooks, prompts, resources, and client
providers.
Tooling
@mcp-b/webmcp-extension
Chromium MV3 template and isolated-world client helper for installing WebMCP and calling page
tools, including declarative tools, from an extension.
@mcp-b/webmcp-local-relay
Local relay server that connects browser-hosted WebMCP tools to desktop MCP clients over stdio
and WebSocket.
@mcp-b/smart-dom-reader
Token-efficient DOM extraction library for AI agents, selector generation, and structured page
understanding.