Budget

use praisonai::Agent;

let agent = Agent::new()
    .name("Assistant")
    .max_tokens(10000)  // Token limit
    .build()?;

// Agent stops when limit reached

let response = agent.chat("Hello").await?;
let usage = agent.usage();

println!("Tokens used: {}", usage.total_tokens);
println!("Estimated cost: ${:.4}", usage.estimated_cost);