WebMCP platforms and agents
Use upstream documentation for the proposal, implementations, security guidance, demos, and agent tooling.Chrome WebMCP documentation
Find current setup instructions, API guides, use cases, and Chrome limitations.
Community Group draft
Read the authoritative proposal and follow its issue tracker and test suite.
Codex compatibility snapshot
Compare OpenAI’s official support with dated observations from Codex in ChatGPT’s built-in
browser.
Resources and implementation status
Find the maintained links for browser support, examples, tests, debugging, and evaluation.
Chrome DevTools WebMCP panel
Inspect registered tools, validate schemas, and test calls in Chrome DevTools.
MCP-B packages
Use this site for package selection, runtime behavior, React integration, transports, and the local relay.Browse packages
Compare the packages, then open the overview or API reference for the package you need.
Choose a runtime
Choose native WebMCP, the tool-only polyfill, or the full
@mcp-b/global runtime.Build your first tool
Register and call one tool on a plain HTML page.
Build your first React tool
Register a tool from a React component with lifecycle-aware hooks.
Connect a desktop agent
Connect browser tools to a desktop MCP client through the local relay.
Understand the architecture
Read about MCP-B runtime layers, tool lifecycles, transports, and trust boundaries.