//! Token cost tracking and budget enforcement.
//!
//! Attach a [`CostModel`] to an agent to track cumulative spend. Set
//! [`AgentBuilder::max_budget`](crate::agent::AgentBuilder::max_budget) to
//! abort when a dollar limit is reached.
//!
//! ```ignore
//! use daimon::cost::OpenAiCostModel;
//!
//! let agent = Agent::builder()
//! .model(my_model)
//! .cost_model(OpenAiCostModel)
//! .max_budget(0.50) // $0.50 per prompt
//! .build()?;
//! ```
pub use CostTracker;
pub use ;