cpp

This MCP server is a C++ implementation of the MCP protocol. It provides a modular framework for exposing resources (like files and APIs) and tools via HTTP or stdio transports, following the JSON-RPC 2.0 style used by MCP. Once built, run the server binary to start listening for client connections. The server supports registering tools and resources, and can communicate with clients and other MCP components through HTTP, SSE, or stdio transports depending on how you configure the client. Typical usage includes creating and registering tools (e.g., time, calculator, echo) and exposing resources that clients can read or interact with via the MCP protocol.

Prerequisites:

• A C++17 (or newer) compiler
• CMake (>= 3.15)
• Git

Install and build:

1. Clone the repository with submodules: git clone --recurse-submodules <repository-url> cd <repo-name>

2. Create a build directory and configure with CMake: mkdir -p build cd build cmake .. -DCMAKE_BUILD_TYPE=Release

3. Build the project: cmake --build . --config Release

4. (Optional) Run tests if you built with tests enabled: cmake -DMCP_BUILD_TESTS=ON .. cmake --build . --config Release

5. Run the server (example binary name used in configuration): ./hkr04-cpp-mcp-server

Notes:

• If SSL is required, rebuild with -DMCP_SSL=ON and ensure any certificates are available to the runtime.
• The repository provides examples for HTTP server usage, SSE client, and Stdio client to demonstrate interaction with the MCP server.

Tips and common issues:

• Ensure the binary name matches the one referenced in your mcp_config when deploying.
• If you use stdio transport, you can launch the server as a subprocess and communicate via the Stdio client as shown in the examples.
• When enabling TLS/SSL, provide proper certificates and keys at startup and compile with MCP_SSL=ON.
• If you encounter tool or resource registration errors, verify that the tool/resource registration code is executed before starting the server loop and that the JSON-RPC messages conform to the MCP specification.
• Environment variables like MCP_HOST and MCP_PORT can help tailor network exposure; adjust according to your deployment (e.g., containerized environments).
• Use the provided examples (HTTP server, SSE client, Stdio client) to validate the server behavior before integrating into larger workflows.