> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Context Ledger • Rust AI Agent SDK
> ContextLedger: Tracks token usage across different context segments.
# ContextLedger
> Defined in the [**context**](../modules/context) module.
Rust AI Agent SDK
Tracks token usage across different context segments.
## Fields
| Name | Type | Description |
| -------------- | --------------------------- | ---------------------- |
| `segments` | `Vec<ContextSegment>` | Segments in the ledger |
| `total_tokens` | `usize` | Total tokens used |
| `max_tokens` | `usize` | Maximum allowed tokens |
## Methods
### `new`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn new(max_tokens: usize) -> Self
```
Create a new ledger with max tokens
**Parameters:**
| Name | Type |
| ------------ | ------- |
| `max_tokens` | `usize` |
### `add`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn add(&mut self, segment: ContextSegment) -> ()
```
Add a segment to the ledger
**Parameters:**
| Name | Type |
| --------- | ---------------- |
| `segment` | `ContextSegment` |
### `remaining`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn remaining(&self) -> usize
```
Get remaining tokens
### `is_over_budget`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn is_over_budget(&self) -> bool
```
Check if over budget
### `utilization`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn utilization(&self) -> f64
```
Get utilization percentage
## Source
`praisonai/src/context/mod.rs` at line 95
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