MCP server Official

Everything MCP Server

Reference test MCP server that exercises prompts, resources, tools and sampling, for people building MCP clients.

Author: Model Context Protocol
Works with: Any MCP client
License: MIT
Documented: Oct 2, 2026

What Everything MCP Server is

Attempts to exercise all features of the MCP protocol. The README says it is not intended to be useful, but a test server for client builders.

What it does

Where Everything MCP Server runs and what it adds, from its documentation

Expose test tools, prompts and resources
Demonstrate sampling and other protocol features
Run over stdio, SSE or Streamable HTTP

When to use it

Good fit

Testing an MCP client implementation
Learning what MCP features look like on the wire

Not for

Real work: README says it is not a useful server
Production use of any kind

How to install Everything MCP Server

You need: Node.js (npx)

Make sure Node.js is available
Add the npx command to your MCP client config
Optionally pick a transport: stdio, sse or streamableHttp
Restart the client and inspect the exposed features

Configuration example (from the official docs)

{
  "mcpServers": {
    "everything": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-everything"
      ]
    }
  }
}

Permissions and security

What it can access

Test server; specific permissions not described in the README

Security notes from the maintainers

The root README says these are reference implementations meant as educational examples, not production-ready solutions.
SSE transport is marked deprecated in the README

Review the source before granting an agent access to credentials or production systems. We document what the maintainers state; we do not audit code.

Limitations

Not intended to be useful beyond testing
Full feature list is in docs/features.md, not the README

Frequently asked questions

What is the Everything MCP server for?

Testing MCP clients; it exercises prompts, resources, tools and sampling. source

Should I use Everything MCP in production?

No, the README says it is a test server, not intended to be useful. source

Which transports does Everything MCP support?

stdio, SSE (deprecated) and Streamable HTTP. source

Related guides

Sources and gaps

https://raw.githubusercontent.com/modelcontextprotocol/servers/main/src/everything/README.md readme, checked Oct 2, 2026
https://raw.githubusercontent.com/modelcontextprotocol/servers/main/README.md readme, checked Oct 2, 2026

Not stated by the maintainers: Hosts other than generic MCP clients are not individually named as supported for Claude Code/Cursor/Windsurf/Codex in this README; last_release date not visible in the checked README.