--- title: "MCP vs WebMCP | Agent MCP Directory" description: "MCP vs WebMCP: one sourced difference and a verdict for product engineers, platform leads and agent builders. Read 4 November 2026." canonical: https://agentmcpdirectory.com/compare/mcp-vs-webmcp site: "Agent MCP Directory" last_updated: 2026-11-05 section: "Head-to-heads" --- # MCP vs WebMCP | Agent MCP Directory > MCP vs WebMCP: one sourced difference and a verdict for product engineers, platform leads and agent builders. Read 4 November 2026. Source: https://agentmcpdirectory.com/compare/mcp-vs-webmcp Site: Agent MCP Directory Last reviewed: 2026-11-05 # MCP vs WebMCP Product engineer: Ship an MCP server for API work; add WebMCP on pages where the user is present. Developer-platform lead: WebMCP is a draft in origin trial; MCP has dated spec revisions. Agent builder: WebMCP tools need a browser agent; most chat clients reach MCP servers instead. ## The sourced difference MCP runs over stdio or Streamable HTTP to a server; WebMCP registers tools inside a web page through document.modelContext, so only an agent running in the browser can call them. (MCP: [MCP transports overview, 2026-07-28](https://modelcontextprotocol.io/specification/2026-07-28/basic/transports), read 5 November 2026; WebMCP: [webmachinelearning/webmcp](https://github.com/webmachinelearning/webmcp), read 5 November 2026 and [Cloudflare changelog: Browser Run adds WebMCP to Kitesurf, moves to document.modelContext (28 Sep 2026)](https://developers.cloudflare.com/changelog/post/2026-09-28-webmcp-api/), read 5 November 2026) ## Verdicts by reader | Reader | Verdict | | --- | --- | | Product engineer | Ship an MCP server for API work; add WebMCP on pages where the user is present. | | Developer-platform lead | WebMCP is a draft in origin trial; MCP has dated spec revisions. | | Agent builder | WebMCP tools need a browser agent; most chat clients reach MCP servers instead. | ## Side by side | Aspect | MCP | WebMCP | | --- | --- | --- | | Maintainer | MCP maintainers under the Agentic AI Foundation | W3C Web Machine Learning Community Group (editors from Microsoft and Google) | | What it is | A JSON-RPC 2.0 protocol between hosts, clients and servers; servers offer tools, resources and prompts, and clients may offer elicitation. | A browser API that lets a page register JavaScript functions as tools, with descriptions and schemas, that an in-browser agent can call. | | Status and version | Current revision 2026-07-28 (released 28 Jul 2026); prior revision 2025-11-25. Registry in preview with API v0.1 frozen since 24 Oct 2025. | Draft specification; Chrome and Edge test it in an origin trial, Brave behind a flag, no Firefox or Safari implementation (nekuda FAQ, October 2026). | | What it does not do | Does not grade servers, verify registry entries, or prescribe a .well-known discovery file in the 2026-07-28 core spec; server cards are still Working Group work. | Does not work without a browser agent that reads the page; does not replace a server-side MCP endpoint; the declarative form-based API is only being explored. | Read the full entries: [MCP](https://agentmcpdirectory.com/standards/mcp/) and [WebMCP](https://agentmcpdirectory.com/standards/webmcp/). ## Seen in the shared crawl | Path | Top 10,000 found | Ora leaderboard found | | --- | --- | --- | | /.well-known/mcp.json | 19 of 7,470 (0.25%) | 66 of 3,366 (1.96%) | A path counts only when the answer is the right kind of document. Many sites answer these paths with an ordinary web page, which is not counted. See [the census](https://agentmcpdirectory.com/census/). The shared crawl looks for WebMCP in the initial HTML of each home page. It found a WebMCP hint on 25 of 7,545 home pages in the Tranco top 10,000 and on 59 of 3,393 on Ora's leaderboard. Edition 4 November 2026 Method [How rows are verified](https://agentmcpdirectory.com/method/) Data [CSV and JSON](https://agentmcpdirectory.com/data/) Markdown [This page as markdown](https://agentmcpdirectory.com/compare/mcp-vs-webmcp/index.md) ## Sources - [MCP transports overview, 2026-07-28](https://modelcontextprotocol.io/specification/2026-07-28/basic/transports), read 5 November 2026 - [webmachinelearning/webmcp](https://github.com/webmachinelearning/webmcp), read 5 November 2026 - [Cloudflare changelog: Browser Run adds WebMCP to Kitesurf, moves to document.modelContext (28 Sep 2026)](https://developers.cloudflare.com/changelog/post/2026-09-28-webmcp-api/), read 5 November 2026 - [MCP specification or home](https://modelcontextprotocol.io/specification/latest), read 4 November 2026 Last reviewed 5 November 2026