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Packages are the primary entry point for this documentation. Start with a package overview when you need to choose the right building block, then move into that package’s reference page for API details. Cross-package concepts stay in Explanation. Task-oriented setup stays in Tutorials and How-To Guides.

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Core runtime

@mcp-b/webmcp-types

Zero-runtime TypeScript contracts for MCP-B packages, schema inference, Document augmentation, and deprecated Navigator compatibility.

@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-adapted MCP TypeScript SDK that provides BrowserMcpServer and supports dynamic tool registration.

@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.

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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.

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Tooling

@mcp-b/webmcp-extension

Chromium MV3 template and isolated-world client helper for installing WebMCP and calling page tools, including declarative forms, 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.