$ rmcp_

Crate

Name: rmcp New version: 1.0.0-alpha Release date: 2026-03-03T16:27:29.826083Z

Crate readme

Short description An official Rust Model Context Protocol SDK implementation with tokio async runtime.

Long description This repository contains the following crates: rmcp, the core crate providing the RMCP protocol implementation, and rmcp-macros, a procedural macro crate for generating RMCP tool implementations. It allows servers to expose data identified by URIs, handle typed prompts, and supports subscriptions for resource updates.

Features • tokio async runtime • server feature flag • provides protocol implementation • supports resource subscriptions

Code Examples Import the crate

 rmcp = { version = "0.16.0", features = ["server"] }
// or dev channel
rmcp = { git = "https://github.com/modelcontextprotocol/rust-sdk", branch = "main" }

Start a client

 use rmcp::{ServiceExt, transport::{TokioChildProcess, ConfigureCommandExt}};
use tokio::process::Command;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = ().serve(TokioChildProcess::new(Command::new("npx").configure(|cmd| {
        cmd.arg("-y").arg("@modelcontextprotocol/server-everything");
    }))?).await?;
    Ok(())
}

Build a transport

 use tokio::io::{stdin, stdout};
let transport = (stdin(), stdout());

Send a notification

 context.peer.notify_resource_list_changed().await?;

Set the server's log level

 client.set_level(SetLevelRequestParams {
    level: LoggingLevel::Warning,
    meta: None,
}).await?;

Links • https://crates.io/crates/rmcp • https://docs.rs/rmcp/latest/rmcp • https://github.com/modelcontextprotocol/rust-sdk/discussions/716 • https://modelcontextprotocol.io/specification/2025-11-25

https://docs.rs/rmcp https://api.github.com/repos/modelcontextprotocol/rust-sdk/releases/292622427

Release info

Release version:

Release description

Code Examples