https://docs.rs/turbomcp

TurboMCP

High-performance Rust SDK for the Model Context Protocol (MCP) with SIMD acceleration, enterprise security, and ergonomic APIs.

Overview

turbomcp is the main framework crate providing a high-level, ergonomic API for building Model Context Protocol servers. Built on a foundation of performance-optimized infrastructure crates, it offers zero-boilerplate development with production-ready features.

Key Features

🚀 High Performance

• SIMD-accelerated JSON processing - 2-3x faster than standard libraries
• Zero-copy message handling - Minimal memory allocations
• Efficient connection management - Connection pooling and reuse
• Optimized request routing - O(1) handler lookup with parameter injection

🎯 Zero Boilerplate

• Procedural macros - #[server], #[tool], #[resource], #[prompt]
• Automatic schema generation - JSON schemas from Rust types
• Type-safe parameters - Compile-time validation and conversion
• Context injection - Request context available anywhere in signature

🛡️ Enterprise Security

• OAuth 2.0 integration - Google, GitHub, Microsoft providers
• PKCE security - Proof Key for Code Exchange by default
• CORS protection - Comprehensive cross-origin policies
• Rate limiting - Token bucket algorithm with burst capacity
• Security headers - CSP, HSTS, X-Frame-Options

🔗 Multi-Transport

• STDIO - Standard input/output for local processes
• HTTP/SSE - Server-Sent Events for web applications
• WebSocket - Real-time bidirectional communication
• TCP - Network socket communication
• Unix Sockets - Local inter-process communication

⚡ Circuit Breaker & Reliability

• Circuit breaker pattern - Prevents cascade failures
• Exponential backoff retry - Intelligent error recovery
• Connection health monitoring - Automatic failure detection
• Graceful degradation - Fallback mechanisms

Architecture

TurboMCP is built as a layered architecture with clear separation of concerns:

┌─────────────────────────────────────────────────────────────┐
│                      TurboMCP Framework                     │
│              Ergonomic APIs & Developer Experience         │
├─────────────────────────────────────────────────────────────┤
│                   Infrastructure Layer                     │
│          Server • Client • Transport • Protocol            │
├─────────────────────────────────────────────────────────────┤
│                     Foundation Layer                       │
│             Core Types • Messages • State                  │
└─────────────────────────────────────────────────────────────┘

Components:

• turbomcp-core - Performance-critical types and SIMD acceleration
• turbomcp-protocol - MCP specification implementation
• turbomcp-transport - Multi-protocol transport with circuit breakers
• turbomcp-server - Server framework with OAuth 2.0
• turbomcp-client - Client implementation with error recovery
• turbomcp-macros - Procedural macros for ergonomic APIs
• turbomcp-cli - Command-line tools for development and testing

Quick Start

Installation

Add TurboMCP to your Cargo.toml:

[dependencies]
turbomcp = "1.1.0-exp.2"
tokio = { version = "1.0", features = ["full"] }

Basic Server

Create a simple calculator server:

use turbomcp::prelude::*;

#[derive(Clone)]
struct Calculator;

#[server]
impl Calculator {
    #[tool("Add two numbers")]
    async fn add(&self, a: i32, b: i32) -> McpResult<i32> {
        Ok(a + b)
    }

    #[tool("Get server status")]
    async fn status(&self, ctx: Context) -> McpResult<String> {
        ctx.info("Status requested").await?;
        Ok("Server running".to_string())
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    Calculator.run_stdio().await?;
    Ok(())
}

Run the Server

# Build and run
cargo run

# Test with TurboMCP CLI
cargo install turbomcp-cli

# For HTTP server
turbomcp-cli tools-list --url http://localhost:8080/mcp

# For STDIO server  
turbomcp-cli tools-list --command "./target/debug/my-server"

Core Concepts

Server Definition

Use the #[server] macro to automatically implement the MCP server trait:

use turbomcp::prelude::*;

#[derive(Clone)]
struct MyServer {
    database: Arc<Database>,
    cache: Arc<Cache>,
}

#[server]
impl MyServer {
    // Tools, resources, and prompts defined here
}

Tool Handlers

Transform functions into MCP tools with automatic parameter handling:

#[tool("Calculate expression")]
async fn calculate(
    &self,
    #[description("Mathematical expression")]
    expression: String,
    #[description("Precision for results")]
    precision: Option<u32>,
    ctx: Context
) -> McpResult<f64> {
    let precision = precision.unwrap_or(2);
    ctx.info(&format!("Calculating: {}", expression)).await?;
    
    // Calculation logic
    let result = evaluate_expression(&expression)?;
    Ok(round_to_precision(result, precision))
}

Resource Handlers

Create URI template-based resource handlers:

#[resource("file://{path}")]
async fn read_file(
    &self,
    #[description("File path to read")]
    path: String,
    ctx: Context
) -> McpResult<String> {
    ctx.info(&format!("Reading file: {}", path)).await?;
    
    tokio::fs::read_to_string(&path).await
        .map_err(|e| McpError::Resource(e.to_string()))
}

Prompt Templates

Generate dynamic prompts with parameter substitution:

#[prompt("code_review")]
async fn code_review_prompt(
    &self,
    #[description("Programming language")]
    language: String,
    #[description("Code to review")]
    code: String,
    ctx: Context
) -> McpResult<String> {
    ctx.info(&format!("Generating {} code review", language)).await?;
    
    Ok(format!(
        "Please review the following {} code:\n\n```{}\n{}\n```",
        language, language, code
    ))
}

Context Injection

The Context parameter provides request correlation, authentication, and observability:

#[tool("Authenticated operation")]
async fn secure_operation(&self, ctx: Context, data: String) -> McpResult<String> {
    // Authentication
    let user = ctx.authenticated_user()?;
    
    // Logging with correlation
    ctx.info(&format!("Processing request for user: {}", user.id)).await?;
    
    // Request metadata
    let request_id = ctx.request_id();
    let start_time = ctx.start_time();
    
    // Processing...
    let result = process_data(&data).await?;
    
    // Performance tracking
    ctx.record_metric("processing_time", start_time.elapsed()).await?;
    
    Ok(result)
}

Authentication & Security

OAuth 2.0 Setup

TurboMCP provides built-in OAuth 2.0 support:

use turbomcp::prelude::*;
use turbomcp::auth::*;

#[derive(Clone)]
struct SecureServer {
    oauth_providers: Arc<RwLock<HashMap<String, OAuth2Provider>>>,
}

#[server]
impl SecureServer {
    #[tool("Get user profile")]
    async fn get_user_profile(&self, ctx: Context) -> McpResult<UserProfile> {
        let user = ctx.authenticated_user()
            .ok_or_else(|| McpError::Unauthorized("Authentication required".to_string()))?;
        
        Ok(UserProfile {
            id: user.id,
            name: user.name,
            email: user.email,
        })
    }

    #[tool("Start OAuth flow")]
    async fn start_oauth_flow(&self, provider: String) -> McpResult<String> {
        let providers = self.oauth_providers.read().await;
        let oauth_provider = providers.get(&provider)
            .ok_or_else(|| McpError::InvalidInput(format!("Unknown provider: {}", provider)))?;
        
        let auth_result = oauth_provider.start_authorization().await?;
        Ok(format!("Visit: {}", auth_result.auth_url))
    }
}

Security Configuration

Configure comprehensive security features:

use turbomcp_transport::{AxumMcpExt, McpServerConfig};

let config = McpServerConfig::production()
    .with_cors_origins(vec!["https://app.example.com".to_string()])
    .with_custom_csp("default-src 'self'; connect-src 'self' wss:")
    .with_rate_limit(120, 20)  // 120 req/min, 20 burst
    .with_jwt_auth("your-secret-key".to_string());

let app = Router::new()
    .route("/api/status", get(status_handler))
    .merge(Router::<()>::turbo_mcp_routes_for_merge(mcp_service, config));

Transport Configuration

STDIO Transport (Default)

Perfect for Claude Desktop and local development:

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    MyServer::new().run_stdio().await?;
    Ok(())
}

HTTP/SSE Transport

For web applications and browser integration:

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    MyServer::new().run_http("0.0.0.0:8080").await?;
    Ok(())
}

WebSocket Transport

For real-time bidirectional communication:

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    MyServer::new().run_websocket("0.0.0.0:8080").await?;
    Ok(())
}

Multi-Transport Runtime Selection

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let server = MyServer::new();
    
    match std::env::var("TRANSPORT").as_deref() {
        Ok("http") => server.run_http("0.0.0.0:8080").await?,
        Ok("websocket") => server.run_websocket("0.0.0.0:8080").await?,
        Ok("tcp") => server.run_tcp("0.0.0.0:8080").await?,
        Ok("unix") => server.run_unix("/tmp/mcp.sock").await?,
        _ => server.run_stdio().await?, // Default
    }
    Ok(())
}

Error Handling

Ergonomic Error Creation

Use the mcp_error! macro for easy error creation:

#[tool("Divide numbers")]
async fn divide(&self, a: f64, b: f64) -> McpResult<f64> {
    if b == 0.0 {
        return Err(mcp_error!("Division by zero: {} / {}", a, b));
    }
    Ok(a / b)
}

#[tool("Read file")]
async fn read_file(&self, path: String) -> McpResult<String> {
    tokio::fs::read_to_string(&path).await
        .map_err(|e| mcp_error!("Failed to read file {}: {}", path, e))
}

Error Types

TurboMCP provides comprehensive error types:

use turbomcp::McpError;

match result {
    Err(McpError::InvalidInput(msg)) => {
        // Handle validation errors
    },
    Err(McpError::Unauthorized(msg)) => {
        // Handle authentication errors
    },
    Err(McpError::Resource(msg)) => {
        // Handle resource access errors
    },
    Err(McpError::Transport(msg)) => {
        // Handle transport errors
    },
    Ok(value) => {
        // Process success case
    }
}

Advanced Features

Custom Types and Schema Generation

TurboMCP automatically generates JSON schemas for custom types:

use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize)]
struct CreateUserRequest {
    name: String,
    email: String,
    age: Option<u32>,
}

#[derive(Serialize, Deserialize)]
struct User {
    id: u64,
    name: String,
    email: String,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[tool("Create a new user")]
async fn create_user(&self, request: CreateUserRequest) -> McpResult<User> {
    // Schema automatically generated for both types
    let user = User {
        id: generate_id(),
        name: request.name,
        email: request.email,
        created_at: chrono::Utc::now(),
    };
    
    // Save to database
    self.database.save_user(&user).await?;
    
    Ok(user)
}

Graceful Shutdown

Handle shutdown signals gracefully:

use tokio::signal;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let server = MyServer::new();
    let (server, shutdown_handle) = server.into_server_with_shutdown()?;
    
    let server_task = tokio::spawn(async move {
        server.run_stdio().await
    });
    
    signal::ctrl_c().await?;
    tracing::info!("Shutdown signal received");
    
    shutdown_handle.shutdown().await;
    server_task.await??;
    
    Ok(())
}

Performance Tuning

Enable SIMD acceleration for maximum performance:

[dependencies]
turbomcp = { version = "1.0", features = ["simd"] }

Configure performance settings:

use turbomcp_core::{SessionManager, SessionConfig};

let config = SessionConfig::high_performance()
    .with_simd_acceleration(true)
    .with_connection_pooling(true)
    .with_circuit_breakers(true);

let server = MyServer::new()
    .with_session_config(config)
    .with_compression(true);

Testing

Unit Testing

Test your tools directly:

#[cfg(test)]
mod tests {
    use super::*;
    
    #[tokio::test]
    async fn test_calculator() {
        let calc = Calculator;
        
        let result = calc.test_tool_call("add", serde_json::json!({
            "a": 5,
            "b": 3
        })).await.unwrap();
        
        assert_eq!(result, serde_json::json!(8));
    }
}

Integration Testing

Use the TurboMCP CLI for integration testing:

# Install CLI
cargo install turbomcp-cli

# Test server functionality
turbomcp-cli tools-list --url http://localhost:8080/mcp
turbomcp-cli tools-call --url http://localhost:8080/mcp --name add --arguments '{"a": 5, "b": 3}'
turbomcp-cli schema-export --url http://localhost:8080/mcp --output schemas.json

Client Setup

Claude Desktop

Add to your Claude Desktop configuration:

{
  "mcpServers": {
    "my-turbomcp-server": {
      "command": "/path/to/your/server/binary",
      "args": []
    }
  }
}

Programmatic Client

Use the TurboMCP client:

use turbomcp_client::{ClientBuilder, Transport};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = ClientBuilder::new()
        .transport(Transport::stdio_with_command("./my-server"))
        .connect().await?;

    let tools = client.list_tools().await?;
    println!("Available tools: {:?}", tools);

    let result = client.call_tool("add", serde_json::json!({
        "a": 5,
        "b": 3
    })).await?;
    println!("Result: {:?}", result);

    Ok(())
}

Examples

Explore comprehensive examples in the examples/ directory:

# Basic calculator server
cargo run --example 01_basic_calculator

# File system tools
cargo run --example 02_file_tools

# Database integration
cargo run --example 03_database_server

# Web scraping tools
cargo run --example 04_web_tools

# Authentication with OAuth 2.0
cargo run --example 09_oauth_authentication

# HTTP server with advanced features
cargo run --example 10_http_server

Feature Flags

Feature	Description	Default
simd	Enable SIMD acceleration for JSON processing	❌
oauth	Enable OAuth 2.0 authentication	✅
metrics	Enable metrics collection and endpoints	✅
compression	Enable response compression	✅
all-transports	Enable all transport protocols	✅
minimal	Minimal build (STDIO only)	❌

Development

Building

# Build with all features
cargo build --all-features

# Build optimized for production
cargo build --release --features simd

# Run tests
cargo test --workspace

Contributing

1. Fork the repository
2. Create a feature branch: git checkout -b feature-name
3. Make your changes and add tests
4. Run the full test suite: make test
5. Submit a pull request

Performance

TurboMCP delivers exceptional performance:

• JSON Processing: 2-3x faster than serde_json with SIMD
• Memory Usage: 40% reduction through zero-copy processing
• Concurrent Requests: Linear scaling with Tokio async runtime
• Transport Overhead: Sub-millisecond request routing

Benchmarks

# Run performance benchmarks
cargo bench

# Test SIMD acceleration
cargo run --example simd_performance --features simd

# Profile memory usage
cargo run --example memory_profile

Documentation

• Architecture Guide - System design and components
• Security Features - Comprehensive security documentation
• API Documentation - Complete API reference
• Performance Guide - Optimization strategies
• Examples - Ready-to-use code examples

Related Projects

• Model Context Protocol - Official protocol specification
• Claude Desktop - AI assistant with MCP support
• MCP Servers - Official server implementations

License

Licensed under the MIT License.

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Built with ❤️ by the TurboMCP team. Ready for production, optimized for performance, designed for developers.