Platform and package boundaries
What is WebMCP?
Understand the proposal and where browser-hosted tools fit.
WebMCP and MCP-B extensions
See which capabilities belong to WebMCP and which MCP-B adds.
Architecture
Runtime layering
Follow initialization from the browser API through the MCP-B runtime.
Transports and bridges
Understand how tools move between pages, frames, tabs, and desktop clients.
Tool lifecycle
Understand registration lifetime, context replacement, and cleanup.
Trust and status
Security and human control
Understand MCP-B trust boundaries and user-controlled execution.
WebMCP resources and status
Find upstream specifications, browser support, debugging tools, examples, and tests.