MCP SDK
The standard SDK for building production-ready MCP servers — error handling, validation, logging, and telemetry out of the box
What is MCP SDK?
MCP SDK is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to standard sdk for building production-ready mcp servers — error handling, validation, logging, and telemetry out of the box
The standard SDK for building production-ready MCP servers — error handling, validation, logging, and telemetry out of the box
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- The standard SDK for building production-ready MCP servers —
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx mcp-sdkConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use MCP SDK
The MCP SDK for Rust (mcp-sdk) is a minimalistic, production-ready library for building Model Context Protocol servers in Rust. It provides the building blocks — custom tool definitions, input schema validation, stdio transport, and async request handling — that developers need to expose capabilities to LLM clients like Claude Desktop. Prioritizing simplicity and compatibility over completeness, it lets you ship a working MCP server with just a few hundred lines of Rust without fighting a heavyweight framework.
Prerequisites
- Rust toolchain (rustup + cargo) installed, stable channel recommended
- Cargo.toml dependency: mcp-sdk from crates.io
- An MCP-compatible client such as Claude Desktop or VS Code with MCP extension
- Basic familiarity with async Rust (tokio runtime)
Add mcp-sdk to your Cargo project
Create a new Rust binary project and add mcp-sdk as a dependency. The crate is published on crates.io under the name mcp-sdk.
cargo new my-mcp-server --bin
cd my-mcp-server
cargo add mcp-sdk tokio --features tokio/fullImplement the Tool trait
Define your custom tools by implementing the Tool trait. Each tool specifies its name, a description the LLM sees, a JSON Schema for its input parameters, and an async execute method that returns a result string.
Build and configure the server
Use Server::builder() to register your tool implementations and configure capabilities such as tools/list, tools/call, and resources/list handlers. The server uses stdio transport so it can be launched by any MCP client.
Compile the binary
Build a release binary. The resulting executable is what your MCP client will invoke.
cargo build --release
# Binary at: ./target/release/my-mcp-serverRegister with Claude Desktop
Add your compiled binary to the Claude Desktop MCP server configuration. Point the command field at the absolute path of your release binary.
{
"mcpServers": {
"my-mcp-server": {
"command": "/absolute/path/to/my-mcp-server",
"args": []
}
}
}MCP SDK Examples
Client configuration
Example claude_desktop_config.json entry for a compiled Rust MCP server built with mcp-sdk.
{
"mcpServers": {
"my-mcp-server": {
"command": "/home/user/my-mcp-server/target/release/my-mcp-server",
"args": []
}
}
}Prompts to try
Once your custom tools are registered, interact with them through your MCP client.
- "List all tools available from my MCP server."
- "Call the <your_tool_name> tool with these parameters: ..."
- "What resources does this server expose?"Troubleshooting MCP SDK
Claude Desktop cannot find or launch the server binary
Ensure the command path in claude_desktop_config.json is an absolute path. Run the binary directly from your terminal first to confirm it starts without errors.
Tool schema validation errors when calling a tool
Double-check that the JSON Schema defined in your Tool trait implementation matches the actual fields and types you expect. Use serde_json's validator or test your schema against a JSON Schema validator online.
Server exits immediately on startup
mcp-sdk uses stdio transport — the server should block waiting for input on stdin. Ensure you are calling the server's run() method and not exiting the async runtime prematurely. Add RUST_LOG=debug for verbose output.
Frequently Asked Questions about MCP SDK
What is MCP SDK?
MCP SDK is a Model Context Protocol (MCP) server that standard sdk for building production-ready mcp servers — error handling, validation, logging, and telemetry out of the box It connects AI assistants to external tools and data sources through a standardized interface.
How do I install MCP SDK?
Follow the installation instructions on the MCP SDK GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with MCP SDK?
MCP SDK works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is MCP SDK free to use?
Yes, MCP SDK is open source and available under the Apache-2.0 license. You can use it freely in both personal and commercial projects.
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