MCP C++ SDK - Model Context Protocol Implementation for C++

The most comprehensive C++ implementation of the Model Context Protocol (MCP) for building AI-powered applications. Production-ready SDK with enterprise features including multi-transport support, connection pooling, and multi-language bindings via C API (Python, TypeScript, Go, Rust, Java, C#, Ruby and more).

⭐ Please give a star if you find this useful!

Architecture Overview

┌─────────────────────────────────────────────────────────────────────┐
│ Application Layer │
│ ┌────────────────────────────────────────────────────────────────┐ │
│ │ MCP Server │ MCP Client │ Custom Applications │ │
│ └────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ Cross-Language Binding Layer │
│ ┌────────────────────────────────────────────────────────────────┐ │
│ │ Python │ TypeScript │ Go │ Rust │ Java │ C# │ Ruby │ Swift │ │
│ └────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ C API (FFI Layer) │
│ ┌────────────────────────────────────────────────────────────────┐ │
│ │ libgopher_mcp_c: Opaque Handles │ RAII Guards │ Type Safety │ │
│ └────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ Protocol Layer │
│ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ┌────────────┐ │
│ │ JSON-RPC │ │ Requests │ │ Responses │ │ Notify │ │
│ │ Codec │ │ Dispatch │ │ Routing │ │ Stream │ │
│ └──────────────┘ └──────────────┘ └──────────────┘ └────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ Filter Chain Layer │
│ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ┌────────────┐ │
│ │ HTTP / SSE │ │ Routing │ │ Rate Limiter │ │ Auth │ │
│ │ Codecs │ │ & CORS │ │ Circuit Brk │ │ Metrics │ │
│ └──────────────┘ └──────────────┘ └──────────────┘ └────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ Transport Layer │
│ ┌────────────────────────────────────────────────────────────────┐ │
│ │ Stdio │ HTTP(S)+SSE │ Streamable HTTP │ WebSocket │ TCP │ │
│ └────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ Network Layer │
│ ┌────────────────┐ ┌────────────────┐ ┌────────────────┐ │
│ │ Connection │ │ Listener │ │ Socket │ │
│ │ Management │ │ & Accept │ │ Interface │ │
│ └────────────────┘ └────────────────┘ └────────────────┘ │
├─────────────────────────────────────────────────────────────────────┤
│ Event Loop & Dispatcher │
│ ┌────────────────────────────────────────────────────────────────┐ │
│ │ Libevent │ Timer Management │ I/O Events │ Buffer │ Result │ │
│ └────────────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

Design Principles

Thread-Safe Dispatcher Model - All I/O in dispatcher threads, no complex synchronization
Filter Chain Architecture - Modular, composable request processing
Production Patterns - Connection pooling, circuit breaker, graceful shutdown

Cross-Language Support

Use MCP C++ SDK from any programming language via the stable C API (libgopher_mcp_c):

Language	Binding Type	Features
Python	ctypes/cffi	Async support, type hints
TypeScript/Node.js	N-API	High performance, native async
Go	CGO	Goroutine-safe wrappers
Rust	FFI	Safe wrappers, ownership guarantees
Java	JNI	Automatic resource management
C#/.NET	P/Invoke	Async/await support
Ruby	Native extension	GC integration

# Installation paths
Headers: /usr/local/include/gopher-mcp/mcp/c_api/
Library: /usr/local/lib/libgopher_mcp_c.{so,dylib,dll}

What is MCP?

Model Context Protocol (MCP) is an open protocol that enables AI models (like Claude, GPT, etc.) to securely interact with external tools, data sources, and services. MCP provides a standardized way for:

AI assistants to access files, databases, and APIs
Developers to expose tools and resources to AI models
Applications to integrate AI capabilities with enterprise systems

This MCP C++ SDK implements the official MCP specification in high-performance C++, suitable for:

Embedded systems and IoT devices
High-frequency trading and real-time applications
Game engines and graphics applications
Native desktop and mobile applications
Backend services requiring low latency

Features

Category	Features
Protocol	Full MCP 2025-06-18, 2025-11-25 and 2026-07-28 specifications, JSON-RPC 2.0, resources, tools, prompts
Transports	stdio, HTTP+SSE, HTTPS+SSE, WebSocket, TCP
Performance	Zero-copy buffers, lock-free operations, connection pooling
Reliability	Circuit breaker, rate limiting, retry with backoff, graceful shutdown
Security	TLS/SSL, authentication middleware, request validation
Observability	Structured logging, metrics, health endpoints
Cross-Language	C API for Python, Node.js, Go, Rust, Java, C#, Ruby bindings

Quick Start

Build and Install

# Show all available commands
make help# Build
make
# Install (auto-prompts for sudo if needed)
make install
# Run tests
make test

Create an MCP Server

#include"mcp/server/mcp_server.h"intmain() {
mcp::server::McpServerConfig config;
config.server_name = "my-mcp-server";
auto server = mcp::server::createMcpServer(config);
// Register a tool
mcp::Tool calculator;
calculator.name = "add";
calculator.description = "Add two numbers";
server->registerTool(calculator, [](const std::string& name,
const mcp::optional<mcp::Metadata>& arguments,
mcp::server::SessionContext& ctx) {
mcp::CallToolResult result;
auto args = arguments.value();
auto a_it = args.find("a");
auto b_it = args.find("b");
double a = mcp::holds_alternative<double>(a_it->second)
? mcp::get<double>(a_it->second) : 0.0;
double b = mcp::holds_alternative<double>(b_it->second)
? mcp::get<double>(b_it->second) : 0.0;
result.content.push_back(mcp::TextContent{"Result: " + std::to_string(a + b)});
return result;
});
server->listen("http://0.0.0.0:3000");
server->run();
}

Create an MCP Client

#include"mcp/client/mcp_client.h"intmain() {
mcp::client::McpClientConfig config;
config.client_name = "my-mcp-client";
auto client = mcp::client::createMcpClient(config);
client->connect("http://localhost:3000");
// Initialize protocolauto init = client->initializeProtocol().get();
// Call a toolauto args = mcp::make<mcp::Metadata>()
.add("a", 10.0)
.add("b", 5.0)
.build();
auto result = client->callTool("add", mcp::make_optional(args)).get();
}

Examples

See examples/mcp/README.md for complete working examples:

# Terminal 1: Start server
./build/examples/mcp/mcp_example_server --verbose
# Terminal 2: Run client with demo
./build/examples/mcp/mcp_example_client --demo --verbose

The example server includes:

Resource registration and subscriptions
Tool execution (calculator, database query, system info)
Prompt templates
Session management
HTTP/SSE endpoints

Installation

Prerequisites

C++14 compiler (GCC 8+, Clang 10+, MSVC 2019+)
CMake 3.10+
libevent 2.1+
OpenSSL 1.1+ (optional, for TLS)

Build Options

# Debug build
make debug
# Release build
make release
# Static libraries only
cmake -B build -DBUILD_SHARED_LIBS=OFF
# Without C API
cmake -B build -DBUILD_C_API=OFF
# Custom install prefix
cmake -B build -DCMAKE_INSTALL_PREFIX=~/.local

Windows (Cygwin + MinGW)

Building on Windows requires Cygwin with MinGW-w64 toolchain:

Prerequisites

Install Cygwin with these packages:

make, cmake - Build tools
mingw64-x86_64-gcc-g++ - MinGW C++ compiler
mingw64-x86_64-libevent - Event library
mingw64-x86_64-openssl - SSL/TLS library

Build Commands

# From Cygwin bash shell
./build-mingw.sh # Release build (default)
./build-mingw.sh debug # Debug build
./build-mingw.sh release # Release build
./build-mingw.sh clean # Clean build directory

Output

Build directory: build-mingw/
Executable: build-mingw/examples/mcp/mcp_example_server.exe

Documentation

MCP C++ Documentation

Examples Guide - Working server and client examples

MCP CPP Core Components

MCP Protocol in C++ - Model Context Protocol implementation details
Filter Chain - Processing pipeline architecture
Transport Layer - Transport implementations
Network Layer - Connection management and socket abstraction

Design Documents

Event Loop Design - Event-driven architecture and dispatcher design
Filter Usage Guide - Comprehensive guide for using and creating filters
CTAD Alternatives - Class Template Argument Deduction alternatives for C++14
MCP Serialization Coverage - JSON serialization implementation details

Comparison with Other C++ MCP SDKs

Several C++ implementations of the Model Context Protocol exist. They serve different needs — this table is meant to help you pick the right one:

	gopher-mcp (this SDK)	hkr04/cpp-mcp	Neumann-Labs/mcp-cpp
Focus	Production / enterprise deployments	Lightweight, minimal footprint	Modern C++20 framework
MCP spec version	2025-06-18, 2025-11-25, 2026-07-28	2025-03-26	2025-11-25 (in progress)
C++ standard	C++14 / 17 / 20	C++17	C++20
Transports	stdio, HTTP+SSE, HTTPS, Streamable HTTP, WebSocket, TCP	stdio, HTTP+SSE	stdio, HTTP
Client + server	Yes	Yes	Yes
TLS	Yes	Yes (build flag)	—
Event model	Event-driven dispatcher (libevent), thread-safe by design	—	—
Resilience	Connection pooling, circuit breaker, rate limiting, backpressure	—	—
Observability	Metrics, tracing hooks, structured logging	—	—
Language bindings	Python, TypeScript, Go, Rust, Java, C#, Ruby via stable C API	C++ only	C++ only
License	Apache-2.0	MIT	MIT

If you need a small dependency for a quick stdio tool, a lightweight SDK like cpp-mcp is a fine choice. If you need an MCP C++ SDK for production — long-lived connections, multiple transports, observability, or calling the SDK from other languages — that is what gopher-mcp is built for.

FAQ

What is the Model Context Protocol?

MCP is an open protocol by Anthropic that standardizes how AI models interact with external tools and data. It defines JSON-RPC methods for resources (data), tools (actions), and prompts (templates).

Why use C++ for MCP?

C++ provides maximum performance and portability. This SDK is ideal for embedded systems, real-time applications, game engines, and any environment where Python/Node.js overhead is unacceptable.

Does this work with Claude, GPT, and other AI models?

Yes. MCP is model-agnostic. Any AI system that supports MCP can use servers built with this SDK.

How do I integrate with my Python/Node.js application?

Use the C API bindings. The SDK provides a stable C interface that can be called from any language with FFI support.

Is this production-ready?

Yes. The SDK includes connection pooling, circuit breakers, rate limiting, TLS support, and comprehensive error handling suitable for enterprise deployments.

What transports are supported?

stdio - Standard input/output (CLI tools)
HTTP+SSE - HTTP with Server-Sent Events (web applications)
HTTPS+SSE - Secure HTTP+SSE
WebSocket - Bidirectional real-time
TCP - Raw TCP sockets

How does this compare to cpp-mcp and other C++ MCP libraries?

See the comparison table. In short: gopher-mcp targets production use — more transports (Streamable HTTP, WebSocket, TCP), connection pooling, circuit breakers, observability, and multi-language bindings — while lighter SDKs optimize for minimal footprint.

How do I contribute?

See CONTRIBUTING.md for guidelines. Issues and pull requests welcome!

Adopters

Using this MCP C++ SDK in your product or project? We'd love to list you here — open a pull request or issue to add yourself.

Gopher Security - MCP-native AI security platform

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 are welcome! Please read our contributing guidelines before submitting pull requests.

License

Apache License 2.0 - see LICENSE for details.

Name		Name	Last commit message	Last commit date
.github/workflows		.github/workflows
bindings		bindings
cmake		cmake
docker-mcp		docker-mcp
docs		docs
examples		examples
include/mcp		include/mcp
scripts		scripts
sdk		sdk
shell		shell
src		src
tests		tests
.clang-format		.clang-format
.dockerignore		.dockerignore
.gitignore		.gitignore
.nvmrc		.nvmrc
CHANGELOG.md		CHANGELOG.md
CMakeLists.txt		CMakeLists.txt
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
build-mingw.sh		build-mingw.sh
build.sh		build.sh
client_test.exp		client_test.exp
dump-version.sh		dump-version.sh
test_mcp_client.py		test_mcp_client.py
vcpkg.json		vcpkg.json

Uh oh!

Latest commit

History

Folders and files

Repository files navigation

MCP C++ SDK - Model Context Protocol Implementation for C++

Table of Contents

Architecture Overview

Design Principles

Cross-Language Support

What is MCP?

Features

Quick Start

Build and Install

Create an MCP Server

Create an MCP Client

Examples

Installation

Prerequisites

Build Options

Windows (Cygwin + MinGW)

Prerequisites

Build Commands

Output

Documentation

MCP C++ Documentation

MCP CPP Core Components

Design Documents

Comparison with Other C++ MCP SDKs

FAQ

What is the Model Context Protocol?

Why use C++ for MCP?

Does this work with Claude, GPT, and other AI models?

How do I integrate with my Python/Node.js application?

Is this production-ready?

What transports are supported?

How does this compare to cpp-mcp and other C++ MCP libraries?

How do I contribute?

Adopters

Keywords & Search Terms

Contributing

License

Related Projects

About

Topics

Resources

Contributing

Stars

Watchers

Forks

Releases

Packages

Used by

Contributors

Languages