Call from Rust

Use RunAgent agents from Rust applications with high-performance, type-safe execution.

Prerequisites

Rust 1.70 or higher
Completed Deploy Your First Agent tutorial

Overview

The Rust SDK provides production-ready access to RunAgent agents with:

Zero-cost abstractions for optimal performance
Futures-based async operations powered by Tokio
Compile-time type safety with comprehensive error handling
Seamless integration with Rust’s ownership model

Installation

Add the following dependencies to your Cargo.toml:

[dependencies]
runagent = "0.1.0"
tokio = { version = "1.0", features = ["full"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"

Basic Usage

Synchronous Execution

Execute an agent and wait for the complete response:

use runagent::client::RunAgentClient;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create client connection
    let client = RunAgentClient::new(
        "your_agent_id_here",
        "main",
        true, // local deployment
    ).await?;

    // Execute agent with parameters
    let result = client.run(&[
        ("message", json!("Hello, how are you?")),
        ("userId", json!("rust_user")),
    ]).await?;

    println!("Response: {}", result);
    Ok(())
}

Asynchronous Execution

Process multiple requests concurrently for improved throughput:

use runagent::client::RunAgentClient;
use serde_json::json;
use futures::future::join_all;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = RunAgentClient::new(
        "your_agent_id_here",
        "main",
        true,
    ).await?;

    // Create concurrent requests
    let futures = (0..5).map(|i| {
        let client = client.clone();
        async move {
            client.run(&[
                ("message", json!(format!("Request {}", i))),
                ("userId", json!("rust_user")),
            ]).await
        }
    });

    // Execute all requests concurrently
    let results = join_all(futures).await;
    
    for (i, result) in results.into_iter().enumerate() {
        match result {
            Ok(response) => println!("Request {}: {}", i, response),
            Err(e) => println!("Request {} failed: {}", i, e),
        }
    }

    Ok(())
}

Advanced Features

Streaming Responses

Process responses as they arrive for real-time applications:

use runagent::client::RunAgentClient;
use serde_json::json;
use futures::StreamExt;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = RunAgentClient::new(
        "your_agent_id_here",
        "streaming", // Entrypoint tag must end with _stream
        true,
    ).await?;

    // Create streaming connection
    let mut stream = client.run_stream(&[
        ("message", json!("Tell me a story")),
        ("userId", json!("rust_user")),
    ]).await?;

    // Process chunks as they arrive
    while let Some(chunk) = stream.next().await {
        match chunk {
            Ok(data) => print!("{}", data),
            Err(e) => {
                eprintln!("Stream error: {}", e);
                break;
            }
        }
    }

    Ok(())
}

Error Handling

Handle different error types with Rust’s type-safe error handling:

use runagent::client::RunAgentClient;
use runagent::types::{RunAgentError, RunAgentResult};
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = RunAgentClient::new(
        "your_agent_id_here",
        "main",
        true,
    ).await?;

    let result = client.run(&[
        ("message", json!("Test message")),
    ]).await;

    match result {
        Ok(response) => {
            println!("Success: {}", response);
        }
        Err(e) => {
            match e {
                RunAgentError::Authentication { .. } => {
                    eprintln!("Authentication failed. Check your API key.");
                }
                RunAgentError::AgentNotFoundError => {
                    eprintln!("Agent not found. Verify the agent ID.");
                }
                RunAgentError::Validation { message } => {
                    eprintln!("Validation error: {}", message);
                }
                RunAgentError::RateLimitError => {
                    eprintln!("Rate limit exceeded. Please retry later.");
                }
                RunAgentError::TimeoutError => {
                    eprintln!("Request timed out.");
                }
                RunAgentError::NetworkError => {
                    eprintln!("Network error. Check your connection.");
                }
                _ => {
                    eprintln!("Unexpected error: {}", e);
                }
            }
        }
    }

    Ok(())
}

Custom Configuration

Configure the client with custom headers and timeouts:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::collections::HashMap;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Prepare custom headers
    let mut headers = HashMap::new();
    headers.insert("X-Request-ID".to_string(), "unique-request-id".to_string());
    headers.insert("X-User-ID".to_string(), "rust_user".to_string());

    // Create client with configuration
    let client = RunAgentClient::new_with_config(
        "your_agent_id_here",
        "main",
        true,
        Some(headers),
        Some(30), // timeout in seconds
    ).await?;

    let result = client.run(&[
        ("message", json!("Hello with custom headers")),
        ("metadata", json!({
            "source": "rust_app",
            "version": "1.0.0"
        })),
    ]).await?;

    println!("Response: {}", result);
    Ok(())
}

Configuration

Environment Variables

Configure the SDK using environment variables:

# API authentication
export RUNAGENT_API_KEY="your-api-key"

# API endpoint
export RUNAGENT_API_URL="https://api.run-agent.ai"

# Default agent
export RUNAGENT_AGENT_ID="your-agent-id"

Configuration File

Create ~/.runagent/config.json:

{
  "apiKey": "your-api-key",
  "apiUrl": "https://api.run-agent.ai",
  "defaultAgentId": "your-agent-id",
  "timeout": 30,
  "retryAttempts": 3
}

Programmatic Configuration

Configure the client directly in code:

use runagent::client::RunAgentClient;
use std::collections::HashMap;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut headers = HashMap::new();
    headers.insert("X-Custom-Header".to_string(), "value".to_string());

    let client = RunAgentClient::new_with_config(
        "your_agent_id_here",
        "main",
        true,
        Some(headers),
        Some(30), // timeout in seconds
    ).await?;

    Ok(())
}

Best Practices

Connection Management

Implement a connection manager for efficient resource usage:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::sync::Arc;
use tokio::sync::Mutex;

struct AgentManager {
    client: Arc<Mutex<RunAgentClient>>,
}

impl AgentManager {
    async fn new(
        agent_id: &str, 
        entrypoint_tag: &str
    ) -> Result<Self, Box<dyn std::error::Error>> {
        let client = RunAgentClient::new(agent_id, entrypoint_tag, true).await?;
        Ok(Self {
            client: Arc::new(Mutex::new(client)),
        })
    }

    async fn run(
        &self, 
        message: &str, 
        options: &[(&str, serde_json::Value)]
    ) -> Result<String, Box<dyn std::error::Error>> {
        let client = self.client.lock().await;
        let mut params = vec![("message", json!(message))];
        params.extend(options.iter().map(|(k, v)| (*k, v.clone())));
        
        let result = client.run(&params).await?;
        Ok(result.to_string())
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let manager = AgentManager::new("your_agent_id", "main").await?;
    let result = manager.run("Hello", &[]).await?;
    println!("Response: {}", result);
    Ok(())
}

Retry Logic

Implement exponential backoff for resilient operations:

use runagent::client::RunAgentClient;
use serde_json::json;
use tokio::time::{sleep, Duration};

async fn run_with_retry(
    client: &RunAgentClient,
    message: &str,
    max_retries: usize,
) -> Result<String, Box<dyn std::error::Error>> {
    let mut last_error = None;
    
    for attempt in 0..max_retries {
        match client.run(&[("message", json!(message))]).await {
            Ok(result) => return Ok(result.to_string()),
            Err(e) => {
                last_error = Some(e);
                if attempt < max_retries - 1 {
                    let backoff = Duration::from_secs(2_u64.pow(attempt as u32));
                    sleep(backoff).await;
                }
            }
        }
    }
    
    Err(last_error.unwrap().into())
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = RunAgentClient::new("your_agent_id", "main", true).await?;
    let result = run_with_retry(&client, "Hello with retry", 3).await?;
    println!("Response: {}", result);
    Ok(())
}

Logging and Monitoring

Add observability to your agent interactions:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::time::Instant;
use tracing::{info, error};

struct MonitoredAgent {
    client: RunAgentClient,
}

impl MonitoredAgent {
    async fn new(
        agent_id: &str, 
        entrypoint_tag: &str
    ) -> Result<Self, Box<dyn std::error::Error>> {
        let client = RunAgentClient::new(agent_id, entrypoint_tag, true).await?;
        Ok(Self { client })
    }

    async fn run(&self, message: &str) -> Result<String, Box<dyn std::error::Error>> {
        info!("Starting request: {}", message);
        let start_time = Instant::now();
        
        match self.client.run(&[("message", json!(message))]).await {
            Ok(result) => {
                let duration = start_time.elapsed();
                info!("Request completed in {:?}", duration);
                Ok(result.to_string())
            }
            Err(e) => {
                let duration = start_time.elapsed();
                error!("Request failed after {:?}: {}", duration, e);
                Err(e.into())
            }
        }
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    tracing_subscriber::fmt::init();
    
    let agent = MonitoredAgent::new("your_agent_id", "main").await?;
    let result = agent.run("Hello with monitoring").await?;
    println!("Response: {}", result);
    Ok(())
}

Common Patterns

Agent Factory Pattern

Create agents with consistent configuration:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::collections::HashMap;

struct AgentFactory {
    base_config: AgentConfig,
}

#[derive(Clone)]
struct AgentConfig {
    local: bool,
    timeout: Option<u64>,
    headers: Option<HashMap<String, String>>,
}

impl AgentFactory {
    fn new(base_config: AgentConfig) -> Self {
        Self { base_config }
    }

    async fn get_agent(
        &self, 
        agent_id: &str, 
        entrypoint_tag: &str
    ) -> Result<RunAgentClient, Box<dyn std::error::Error>> {
        RunAgentClient::new_with_config(
            agent_id,
            entrypoint_tag,
            self.base_config.local,
            self.base_config.headers.clone(),
            self.base_config.timeout,
        ).await.map_err(|e| e.into())
    }

    async fn get_chat_agent(
        &self, 
        agent_id: &str
    ) -> Result<RunAgentClient, Box<dyn std::error::Error>> {
        self.get_agent(agent_id, "chat").await
    }

    async fn get_analysis_agent(
        &self, 
        agent_id: &str
    ) -> Result<RunAgentClient, Box<dyn std::error::Error>> {
        self.get_agent(agent_id, "analyze").await
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let factory = AgentFactory::new(AgentConfig {
        local: true,
        timeout: Some(30),
        headers: None,
    });
    
    let chat_agent = factory.get_chat_agent("your_agent_id").await?;
    let result = chat_agent.run(&[("message", json!("Hello"))]).await?;
    println!("Response: {}", result);
    Ok(())
}

Agent Wrapper Pattern

Encapsulate agent functionality with a clean interface:

use runagent::client::RunAgentClient;
use serde_json::json;
use futures::StreamExt;

struct AgentWrapper {
    client: RunAgentClient,
    agent_id: String,
    entrypoint_tag: String,
}

impl AgentWrapper {
    async fn new(
        agent_id: &str, 
        entrypoint_tag: &str
    ) -> Result<Self, Box<dyn std::error::Error>> {
        let client = RunAgentClient::new(agent_id, entrypoint_tag, true).await?;
        Ok(Self {
            client,
            agent_id: agent_id.to_string(),
            entrypoint_tag: entrypoint_tag.to_string(),
        })
    }

    async fn call(
        &self, 
        params: &[(&str, serde_json::Value)]
    ) -> Result<String, Box<dyn std::error::Error>> {
        self.client.run(params).await.map(|v| v.to_string()).map_err(|e| e.into())
    }

    async fn chat(
        &self, 
        message: &str, 
        user_id: &str
    ) -> Result<String, Box<dyn std::error::Error>> {
        let result = self.client.run(&[
            ("message", json!(message)),
            ("userId", json!(user_id)),
        ]).await?;
        Ok(result.to_string())
    }

    async fn analyze(
        &self, 
        data: &str, 
        analysis_type: &str
    ) -> Result<String, Box<dyn std::error::Error>> {
        let result = self.client.run(&[
            ("data", json!(data)),
            ("analysisType", json!(analysis_type)),
        ]).await?;
        Ok(result.to_string())
    }

    async fn stream(&self, message: &str) -> Result<String, Box<dyn std::error::Error>> {
        let mut stream = self.client.run_stream(&[
            ("message", json!(message))
        ]).await?;
        
        let mut response = String::new();
        while let Some(chunk) = stream.next().await {
            response.push_str(&chunk?.to_string());
        }
        
        Ok(response)
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let agent = AgentWrapper::new("your_agent_id", "main").await?;
    let response = agent.chat("Hello, how are you?", "rust_user").await?;
    println!("Response: {}", response);
    Ok(())
}

Agent Pool Pattern

Distribute load across multiple agent instances:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::sync::Arc;
use tokio::sync::Mutex;

struct AgentPool {
    agents: Vec<Arc<Mutex<RunAgentClient>>>,
    index: Arc<Mutex<usize>>,
}

impl AgentPool {
    async fn new(
        agent_configs: Vec<AgentConfig>
    ) -> Result<Self, Box<dyn std::error::Error>> {
        let mut agents = Vec::new();
        
        for config in agent_configs {
            let client = RunAgentClient::new_with_config(
                &config.agent_id,
                &config.entrypoint_tag,
                config.local,
                config.headers,
                config.timeout,
            ).await?;
            agents.push(Arc::new(Mutex::new(client)));
        }
        
        Ok(Self {
            agents,
            index: Arc::new(Mutex::new(0)),
        })
    }

    async fn get_agent(&self) -> Arc<Mutex<RunAgentClient>> {
        let mut index = self.index.lock().await;
        let agent = self.agents[*index].clone();
        *index = (*index + 1) % self.agents.len();
        agent
    }

    async fn call(
        &self, 
        params: &[(&str, serde_json::Value)]
    ) -> Result<String, Box<dyn std::error::Error>> {
        let agent = self.get_agent().await;
        let client = agent.lock().await;
        client.run(params).await.map(|v| v.to_string()).map_err(|e| e.into())
    }
}

#[derive(Clone)]
struct AgentConfig {
    agent_id: String,
    entrypoint_tag: String,
    local: bool,
    headers: Option<std::collections::HashMap<String, String>>,
    timeout: Option<u64>,
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let pool = AgentPool::new(vec![
        AgentConfig {
            agent_id: "agent1".to_string(),
            entrypoint_tag: "main".to_string(),
            local: true,
            headers: None,
            timeout: None,
        },
        AgentConfig {
            agent_id: "agent2".to_string(),
            entrypoint_tag: "main".to_string(),
            local: true,
            headers: None,
            timeout: None,
        },
    ]).await?;

    let result = pool.call(&[("message", json!("Hello from pool"))]).await?;
    println!("Response: {}", result);
    Ok(())
}

Performance Optimization

Connection Pooling

Reuse connections for improved performance:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::sync::Arc;
use tokio::sync::Mutex;

struct ConnectionPool {
    pool: Vec<Arc<Mutex<RunAgentClient>>>,
    index: Arc<Mutex<usize>>,
}

impl ConnectionPool {
    async fn new(
        agent_id: &str, 
        entrypoint_tag: &str, 
        pool_size: usize
    ) -> Result<Self, Box<dyn std::error::Error>> {
        let mut pool = Vec::new();
        
        for _ in 0..pool_size {
            let client = RunAgentClient::new(agent_id, entrypoint_tag, true).await?;
            pool.push(Arc::new(Mutex::new(client)));
        }
        
        Ok(Self {
            pool,
            index: Arc::new(Mutex::new(0)),
        })
    }

    async fn get_client(&self) -> Arc<Mutex<RunAgentClient>> {
        let mut index = self.index.lock().await;
        let client = self.pool[*index].clone();
        *index = (*index + 1) % self.pool.len();
        client
    }

    async fn run(
        &self, 
        params: &[(&str, serde_json::Value)]
    ) -> Result<String, Box<dyn std::error::Error>> {
        let client = self.get_client().await;
        let client = client.lock().await;
        client.run(params).await.map(|v| v.to_string()).map_err(|e| e.into())
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let pool = ConnectionPool::new("your_agent_id", "main", 5).await?;
    let result = pool.run(&[("message", json!("Hello"))]).await?;
    println!("Response: {}", result);
    Ok(())
}

Response Caching

Cache responses for frequently requested data:

use runagent::client::RunAgentClient;
use serde_json::json;
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::RwLock;

struct CachedAgent {
    client: RunAgentClient,
    cache: Arc<RwLock<HashMap<String, String>>>,
}

impl CachedAgent {
    async fn new(
        agent_id: &str, 
        entrypoint_tag: &str
    ) -> Result<Self, Box<dyn std::error::Error>> {
        let client = RunAgentClient::new(agent_id, entrypoint_tag, true).await?;
        Ok(Self {
            client,
            cache: Arc::new(RwLock::new(HashMap::new())),
        })
    }

    fn cache_key(&self, params: &[(&str, serde_json::Value)]) -> String {
        format!("{:?}", params)
    }

    async fn run(
        &self, 
        params: &[(&str, serde_json::Value)]
    ) -> Result<String, Box<dyn std::error::Error>> {
        let cache_key = self.cache_key(params);
        
        // Check cache
        {
            let cache = self.cache.read().await;
            if let Some(result) = cache.get(&cache_key) {
                return Ok(result.clone());
            }
        }
        
        // Execute agent
        let result = self.client.run(params).await?.to_string();
        
        // Store in cache
        {
            let mut cache = self.cache.write().await;
            cache.insert(cache_key, result.clone());
        }
        
        Ok(result)
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let cached_agent = CachedAgent::new("your_agent_id", "main").await?;
    let result = cached_agent.run(&[("message", json!("Hello"))]).await?;
    println!("Response: {}", result);
    Ok(())
}

Testing

Unit Testing

Test your agent interactions:

use runagent::client::RunAgentClient;
use serde_json::json;

#[tokio::test]
async fn test_agent_client() {
    let client = RunAgentClient::new("test_agent", "main", true)
        .await
        .unwrap();
    
    let result = client.run(&[("message", json!("Hello"))]).await;
    assert!(result.is_ok());
}

#[tokio::test]
async fn test_agent_client_error() {
    let client = RunAgentClient::new("invalid_agent", "main", true)
        .await
        .unwrap();
    
    let result = client.run(&[("message", json!("Hello"))]).await;
    assert!(result.is_err());
}

Integration Testing

Test complete workflows:

use runagent::client::RunAgentClient;
use serde_json::json;
use futures::StreamExt;

#[tokio::test]
async fn test_agent_integration() {
    let client = RunAgentClient::new("test_agent", "main", true)
        .await
        .unwrap();
    
    let result = client.run(&[("message", json!("Hello"))]).await;
    assert!(result.is_ok());
}

#[tokio::test]
async fn test_agent_streaming() {
    let client = RunAgentClient::new("test_agent", "streaming", true)
        .await
        .unwrap();
    
    let mut stream = client.run_stream(&[("message", json!("Hello"))])
        .await
        .unwrap();
    
    let mut response = String::new();
    while let Some(chunk) = stream.next().await {
        response.push_str(&chunk.unwrap().to_string());
    }
    
    assert!(!response.is_empty());
}

Next Steps

Continue your journey with RunAgent:

Async Patterns - Learn advanced async patterns for Rust
Production Deployment - Deploy your Rust applications to production
Multi-Language Integration - Integrate with other programming languages
Performance Tuning - Optimize your Rust applications

Summary

You have learned how to use RunAgent agents from Rust applications. The Rust SDK provides high-performance access with zero-cost abstractions and compile-time type safety, making it ideal for production deployments requiring maximum performance and reliability.

How-to Guides

Frameworks

Call from Different Languages

Deployment

Advanced Tasks

Prerequisites

Overview

Installation

Basic Usage

Synchronous Execution

Asynchronous Execution

Advanced Features

Streaming Responses

Error Handling

Custom Configuration

Configuration

Environment Variables

Configuration File

Programmatic Configuration

Best Practices

Connection Management

Retry Logic

Logging and Monitoring

Common Patterns

Agent Factory Pattern

Agent Wrapper Pattern

Agent Pool Pattern

Performance Optimization

Connection Pooling

Response Caching

Testing

Unit Testing

Integration Testing

Next Steps

Summary

How-to Guides

Frameworks

Call from Different Languages

Deployment

Advanced Tasks

​Prerequisites

​Overview

​Installation

​Basic Usage

​Synchronous Execution

​Asynchronous Execution

​Advanced Features

​Streaming Responses

​Error Handling

​Custom Configuration

​Configuration

​Environment Variables

​Configuration File

​Programmatic Configuration

​Best Practices

​Connection Management

​Retry Logic

​Logging and Monitoring

​Common Patterns

​Agent Factory Pattern

​Agent Wrapper Pattern

​Agent Pool Pattern

​Performance Optimization

​Connection Pooling

​Response Caching

​Testing

​Unit Testing

​Integration Testing

​Next Steps

​Summary

Prerequisites

Overview

Installation

Basic Usage

Synchronous Execution

Asynchronous Execution

Advanced Features

Streaming Responses

Error Handling

Custom Configuration

Configuration

Environment Variables

Configuration File

Programmatic Configuration

Best Practices

Connection Management

Retry Logic

Logging and Monitoring

Common Patterns

Agent Factory Pattern

Agent Wrapper Pattern

Agent Pool Pattern

Performance Optimization

Connection Pooling

Response Caching

Testing

Unit Testing

Integration Testing

Next Steps

Summary