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MCP C++ SDK - Model Context Protocol implementation in CPP with enterprise-grade security, visibility and connectivity.

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MCP C++ / MCP CPP - Enterprise-grade C++ implementation of the Model Context Protocol (MCP) for AI model integration. The most comprehensive MCP C++ SDK with production-ready features.

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MCP C++ Features

This MCP C++ SDK provides a complete implementation of the Model Context Protocol in modern C++, designed for high-performance AI applications and enterprise deployments.

Why Choose This MCP C++ Implementation?

  • Production-Ready: Battle-tested MCP C++ code with enterprise design patterns
  • High Performance: Zero-copy buffers, lock-free operations, and optimized for MCP protocol
  • Cross-Language: C API for FFI bindings to Python, TypeScript, Go, Rust, and more
  • Full MCP Spec: Complete Model Context Protocol implementation in C++
  • Modern C++: Supports C++14/17/20 with best practices

MCP C++ Architecture Overview

Our MCP CPP SDK follows a layered architecture designed for high performance, scalability, and extensibility:

┌─────────────────────────────────────────────────────────────┐│                     Application Layer                       ││  ┌──────────────────────────────────────────────────────┐   ││  │     MCP Server / Client / Custom Applications        │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│              Cross-Language Binding Layer                   ││  ┌──────────────────────────────────────────────────────┐   ││  │ Python │ TypeScript │ Go │ Rust │ Java │ C# │ Ruby   │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│                    C API (FFI Layer)                        ││  ┌──────────────────────────────────────────────────────┐   ││  │ libgopher_mcp_c: Opaque Handles │ Memory Safety      │   ││  │ RAII Guards │ Type Safety │ Error Handling           │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│                      Protocol Layer                         ││  ┌──────────────────────────────────────────────────────┐   ││  │        MCP JSON-RPC Protocol Implementation          │   ││  │       Request/Response/Notification Handling         │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│                    Filter Chain Layer                       ││  ┌──────────────────────────────────────────────────────┐   ││  │   HTTP Codec │ SSE Codec │ Routing │ Rate Limiting   │   ││  │   Circuit Breaker │ Metrics │ Backpressure │ Auth    │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│                    Transport Layer                          ││  ┌──────────────────────────────────────────────────────┐   ││  │ Stdio │ HTTP(s)+SSE │ WebSocket │ TCP │ Redis │ P2P  │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│                     Network Layer                           ││  ┌──────────────────────────────────────────────────────┐   ││  │ Connection Management │ Listener │ Socket Interface  │   ││  └──────────────────────────────────────────────────────┘   │├─────────────────────────────────────────────────────────────┤│                  Event Loop & Dispatcher                    ││  ┌──────────────────────────────────────────────────────┐   ││  │ Libevent Integration │ Timer Management │ I/O Events │   ││  └──────────────────────────────────────────────────────┘   │└─────────────────────────────────────────────────────────────┘

MCP C++ Cross-Language Support

MCP CPP Multi-Language Architecture

The MCP C++ SDK is designed with cross-language support as a first-class feature:

  • Application Layer: MCP server/client implementations using your preferred languages
  • Language Bindings: Native bindings for each language that wrap the C API
  • C API Layer: Stable FFI interface (libgopher_mcp_c) that bridges C++ and other languages

C API Features

The C API provides a complete FFI-safe interface:

  • Opaque handles: Hide C++ implementation details
  • Memory safety: RAII guards and automatic resource management
  • Type safety: Strong typing with comprehensive error handling
  • Thread safety: All operations are thread-safe through the dispatcher model
  • Zero-copy buffers: Efficient data sharing where possible

Supported Languages

Native bindings are available for all mainstream programming languages:

  • Python: ctypes/cffi integration with async support
  • TypeScript/Node.js: N-API bindings for high performance
  • Go: CGO integration with goroutine-safe wrappers
  • Rust: Safe FFI wrappers with ownership guarantees
  • Java: JNI bindings with automatic resource management
  • C#/.NET: P/Invoke with async/await support
  • Ruby: Native extension with GC integration
  • Swift: Direct C interop for iOS/macOS
  • Kotlin: JNI or Kotlin/Native for Android

Each binding maintains language-specific idioms while providing full access to MCP functionality.

MCP C++ Core Design Principles

1. Thread-Safe Dispatcher Model

All I/O operations and state transitions occur within dispatcher threads, eliminating the need for complex synchronization:

  • Each worker thread has its own dispatcher
  • Callbacks are invoked in dispatcher thread context
  • Thread-local storage for connection state

2. Filter Chain Architecture

Modular processing pipeline for extensible functionality:

  • Stateless filters for HTTP/2 concurrent stream support
  • In-place buffer modification for zero-copy performance
  • Dynamic filter composition based on transport and requirements

3. Production Patterns

Following enterprise design patterns:

  • Connection pooling with O(1) insertion/removal
  • Circuit breaker for failure isolation
  • Watermark-based flow control
  • Graceful shutdown with timeout

MCP CPP Key Components

Application Base (mcp_application_base.h)

Base framework providing:

  • Worker thread management
  • Filter chain construction
  • Connection pooling
  • Metrics and observability
  • Graceful lifecycle management

MCP Server (server/mcp_server.h)

Production-ready server with:

  • Multi-transport support (stdio, HTTP+SSE, WebSocket)
  • Session management with timeout
  • Resource subscriptions
  • Tool registration and execution
  • Prompt management

MCP Client (client/mcp_client.h)

Enterprise client featuring:

  • Transport negotiation
  • Connection pooling
  • Circuit breaker pattern
  • Retry with exponential backoff
  • Future-based async API

Network Layer (network/)

Core networking infrastructure:

  • Connection: Manages socket lifecycle and filter chain
  • Listener: Accepts incoming connections
  • Filter: Modular processing units
  • Socket Interface: Platform abstraction

Filter Chain (filter/)

Processing pipeline components:

  • HTTP Codec: HTTP/1.1 and HTTP/2 protocol handling
  • SSE Codec: Server-Sent Events processing
  • Routing: Request routing based on method and path
  • Rate Limiting: Token bucket rate control
  • Circuit Breaker: Failure isolation
  • Metrics: Performance monitoring
  • Backpressure: Flow control

Transport Layer (transport/)

Multiple transport implementations:

  • Stdio: Standard I/O pipes
  • TCP: Raw TCP sockets
  • SSL/TLS: Secure sockets
  • HTTP+SSE: HTTP with Server-Sent Events
  • HTTPS+SSE: Secure HTTP+SSE

Quick Start - MCP C++ Installation

MCP C++ Prerequisites

  • C++14 or later compiler (MCP CPP supports C++14/17/20)
    • GCC 8.0+ (Linux)
  • CMake 3.10+ for building MCP C++ SDK
  • libevent 2.1+ (event loop for MCP protocol)
  • OpenSSL 1.1+ (for MCP SSL/TLS transport)
  • nghttp2 (optional, for MCP HTTP/2 support)

Build & Install

# Quick build and install (default: /usr/local, auto-prompts for sudo)makemake install# Will prompt for password if needed# User-local installation (no sudo required)make build CMAKE_INSTALL_PREFIX=~/.localmake install# Custom installationcmake -B build -DCMAKE_INSTALL_PREFIX=/opt/gopher-mcpmake -C buildmake install# Will use sudo if needed# Uninstall (auto-detects if sudo is needed)make uninstall

Build Options

# Build only C++ libraries (no C API)cmake -B build -DBUILD_C_API=OFF# Build only static librariescmake -B build -DBUILD_SHARED_LIBS=OFF# Build for productionmake releasesudo make install

Running Tests

maketest# Run tests with minimal outputmake test-verbose# Run tests with detailed outputmake test-parallel# Run tests in parallel

For FFI Language Bindings

The C API library (libgopher_mcp_c) is built by default and provides a stable ABI for FFI bindings:

# The C API is included in default installmakemake install# Auto-prompts for sudo if needed# Headers: /usr/local/include/gopher-mcp/mcp/c_api/# Library: /usr/local/lib/libgopher_mcp_c.{so,dylib}

MCP C++ Usage Examples

Creating an MCP Server in C++

// MCP C++ Server Example#include"mcp/server/mcp_server.h"intmain() {    mcp::server::McpServerConfig config;    config.server_name ="my-mcp-server";    config.worker_threads =4;auto server =mcp::server::createMcpServer(config);// Register a tool    mcp::Tool tool;    tool.name ="calculator";    tool.description ="Performs calculations";        server->registerTool(tool, [](const std::string& name,const mcp::optional<mcp::Metadata>& args,                                  mcp::server::SessionContext& session) {// Tool implementation        mcp::CallToolResult result;// ... perform calculation ...return result;    });// Start listening    server->listen("tcp://0.0.0.0:8080");    server->run();return0;}

Creating an MCP Client in C++

// MCP C++ Client Example#include"mcp/client/mcp_client.h"intmain() {    mcp::client::McpClientConfig config;    config.client_name ="my-mcp-client";    config.max_retries =3;auto client =mcp::client::createMcpClient(config);// Connect to server    client->connect("tcp://localhost:8080");// Initialize protocolauto init_future = client->initializeProtocol();auto init_result = init_future.get();// Call a tool    mcp::Metadata args;    args["expression"] ="2 + 2";auto tool_future = client->callTool("calculator", args);auto tool_result = tool_future.get();return0;}

MCP C++ Documentation

MCP CPP Core Components

Design Documents

Keywords & Search Terms

MCP C++,MCP CPP,Model Context Protocol C++,MCP SDK,C++ MCP,CPP MCP,Model Context Protocol CPP,MCP implementation,AI model integration C++,LLM integration C++,MCP server C++,MCP client C++,Model Context Protocol SDK,C++ AI SDK,Enterprise MCP,Production MCP C++

Contributing

Contributions to this MCP C++ SDK are welcome! Please read our contributing guidelines before submitting pull requests.

License

This MCP C++ project is licensed under the Apache License - see the LICENSE file for details.

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