Neva

一个易于配置的Rust MCP服务器和客户端SDK

💡 注意: 该项目目前处于预览阶段。可能会引入破坏性更改，恕不另行通知。

API文档 | 示例

MCP客户端

依赖项

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

代码

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?;

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

    // 调用一个工具
    let args = [
        ("message", "Hello MCP!")
    ];
    let result = client.call_tool("echo", Some(args)).await?;
    println!("{:?}", result.content);

    client.disconnect().await
}

MCP服务器

依赖项

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

代码

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

#[tool(descr = "一个说Hello的工具")]
async fn hello(name: String) -> String {
    format!("Hello, {name}!")
}

#[resource(uri = "res://{name}", descr = "一些关于资源的详细信息")]
async fn get_res(name: String) -> (String, String) {
    (
        format!("res://{name}"),
        format!("关于资源的一些细节：{name}")
    )
}

#[prompt(descr = "分析代码以查找潜在改进")]
async fn analyze_code(lang: String) -> (String, String) {
    (format!("语言：{lang}"), "用户".into())
}

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

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

    app.run().await;
}