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@modelcontextprotocol/server-everything

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MCP server that exercises all the features of the MCP protocol

modelcontextprotocol.io

modelcontextprotocol/servers

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# Everything Server – Architecture **Architecture | [Project Structure](structure.md) | [Startup Process](startup.md) | [Server Features](features.md) | [Extension Points](extension.md) | [How It Works](how-it-works.md)** This documentation summarizes the current layout and runtime architecture of the `src/everything` package. It explains how the server starts, how transports are wired, where tools, prompts, and resources are registered, and how to extend the system. ## High‑level Overview ### Purpose A minimal, modular MCP server showcasing core Model Context Protocol features. It exposes simple tools, prompts, and resources, and can be run over multiple transports (STDIO, Streamable HTTP, and the deprecated HTTP+SSE). It serves both protocol eras: 2026-07-28 clients (`server/discover`, per-request `_meta`, no sessions) and 2025-era clients (`initialize`), from one server factory. ### Design A small “server factory” constructs the MCP server for a protocol era and registers features. Transports are separate entry points that serve the factory and handle network concerns: the SDK's `serveStdio` and `createMcpHandler` entries pick each client's era. Tools, prompts, and resources are organized in their own submodules. ### Multi‑client The server supports multiple concurrent clients. Per-connection state (resource subscriptions, simulated logging) lives on the server instance serving the connection, and state that must outlive a 2026-07-28 request (tasks, minted resources) is stored under handles the server mints. ## Build and Distribution - TypeScript sources are compiled into `dist/` via `npm run build`. - The `build` script copies `docs/` into `dist/` so instruction files ship alongside the compiled server. - The CLI bin is configured in `package.json` as `mcp-server-everything` → `dist/index.js`. ## [Project Structure](structure.md) ## [Startup Process](startup.md) ## [Server Features](features.md) ## [Extension Points](extension.md) ## [How It Works](how-it-works.md)