Neva

## 🚀 Neva

*An easily configurable Rust MCP server and client SDK*

[![Latest Version](https://img.shields.io/badge/最新版本-0.0.6-d8eb34)](https://crates.io/crates/neva)
[![Rustc Requirement](https://img.shields.io/badge/rustc-1.83+-964B00)](https://crates.io/crates/neva)
[![License](https://img.shields.io/badge/许可证-MIT-624bd1.svg)](https://github.com/RomanEmreis/neva/blob/main/LICENSE)
[![CI Status](https://github.com/RomanEmreis/neva/actions/workflows/rust.yml/badge.svg)](https://github.com/RomanEmreis/neva/actions/workflows/rust.yml)
[![Release Status](https://github.com/RomanEmreis/neva/actions/workflows/release.yml/badge.svg)](https://github.com/RomanEmreis/neva/actions/workflows/release.yml)

> ⚠️ **Important Note**
> 
> This project is currently in preview. Breaking changes may be introduced without prior notice.

[API Documentation](https://docs.rs/neva/latest/neva/) | [Examples](https://github.com/RomanEmreis/neva/tree/main/examples)

## 🚀 Quick Start

### ✨ Features
Neva is an easily configurable Rust MCP server and client SDK, which simplifies the development process of MCP servers and clients.

## 📦 Installation

### MCP Client
```toml
[dependencies]
neva = { version = "0.0.6", features = ["client-full"] }
tokio = { version = "1", features = ["full"] }

MCP Server

[dependencies]
neva = { version = "0.0.6", features = ["server-full"] }
tokio = { version = "1", features = ["full"] }

💻 Usage Examples

MCP Client

Basic Usage

use std::time::Duration;
use neva::Client;
use neva::error::Error;

#[tokio::main]
async fn main() -> Result<(), Error> {
    let mut client = Client::new()
        .with_options(|opt| opt
            .with_stdio("npx", ["-y", "@modelcontextprotocol/server-everything"])
            .with_timeout(Duration::from_secs(5)));
    
    client.connect().await?;

    // List tools
    let tools = client.list_tools(None).await?;
    for tool in tools.tools {
        println!("- {}", tool.name);
    }

    // Call a tool
    let args = [
        ("message", "Hello MCP!")
    ];
    let result = client.call_tool("echo", Some(args)).await?;
    println!("{:?}", result.content);

    client.disconnect().await
}

MCP Server

Basic Usage

use neva::{App, tool, resource, prompt};

#[tool(descr = "A tool that says hello")]
async fn hello(name: String) -> String {
    format!("Hello, {name}!")
}

#[resource(uri = "res://{name}", descr = "Some detailed information about the resource")]
async fn get_res(name: String) -> (String, String) {
    (
        format!("res://{name}"),
        format!("Some details about the resource: {name}")
    )
}

#[prompt(descr = "Analyze code for potential improvements")]
async fn analyze_code(lang: String) -> (String, String) {
    (format!("Language: {lang}"), "User".into())
}

#[tokio::main]
async fn main() {
    let mut app = App::new()
        .with_options(|opt| opt
            .with_stdio()
            .with_name("Example MCP Server")
            .with_version("1.0.0"));

    map_hello(&mut app);
    map_get_res(&mut app);
    map_analyze_code(&mut app);

    app.run().await;
}