Is WebMCP open source?

Yes. The repository URL is one of the links on the listing.

Listing

WebMCP

Beta

WebMCP is a beta listing under Protocols. Draft Community Group Report dated 20 October 2026. A page registers JavaScript tools on document.modelContext with registerTool(), and those tools run as client side script in the browser session. Agents, browser agents, and assistive technologies can call them. It is not a W3C Standard. Browser support is experimental. The listing is open source.

Last verified 2026-10-23

Sources

Status: beta
Open source: Yes
Tags: browser, tools, mcp
Last verified: 2026-10-23

Protocol compatibility

Gap note

Glossary

Comparisons

Model Context Protocol vs WebMCP

Filters

Agent protocols

Questions

What is WebMCP?: Draft Community Group Report dated 20 October 2026. A page registers JavaScript tools on document.modelContext with registerTool(), and those tools run as client side script in the browser session. Agents, browser agents, and assistive technologies can call them. It is not a W3C Standard. Browser support is experimental.
What is the status of WebMCP?: WebMCP is beta in Protocols.
Is WebMCP open source?: Yes. The repository URL is one of the links on the listing.
When was WebMCP last verified?: Last verified 2026-10-23.