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@mcp-b/global is the full runtime entry point for browser applications. It installs or adopts the strict WebMCP surface, creates a BrowserMcpServer, connects transport, and exposes MCP-B extension methods on navigator.modelContext.

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When to use this package

  • You want prompts, resources, sampling, elicitation, or transport-facing helpers.
  • You want browser tools to be reachable by extensions, relays, or desktop MCP clients.
  • You want one import that wires the runtime stack together.

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When not to use this package

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Where it sits in the package graph

@mcp-b/global is the top of the runtime stack. It wraps the strict-core layer from @mcp-b/webmcp-polyfill, uses @mcp-b/webmcp-ts-sdk internally, and starts transports from @mcp-b/transports.

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First step

Import the package as early as possible in the browser entry point, then register tools on navigator.modelContext. Use the reference page when you need configuration, cleanup, or transport details.

Reference

Initialization, cleanup, transport configuration, and exported types.

Register prompts and resources

Use the MCP-B extension surface in an app.

Runtime layering

Understand how the runtime stack is assembled.

Connect desktop agents with local relay

Bridge browser tools into desktop MCP clients.