> ## 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 Trace Emitter • Rust AI Agent SDK
> ContextTraceEmitter: Context trace emitter.
# ContextTraceEmitter
> Defined in the [**trace**](../modules/trace) module.
Rust AI Agent SDK
Context trace emitter.
## Fields
| Name | Type | Description |
| ------ | ----------------------------------------- | ----------- |
| `sink` | `Box<dyn ContextTraceSinkProtocol>` | - |
## Methods
### `new`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn new(sink: impl ContextTraceSinkProtocol + 'static) -> Self
```
Create with a specific sink.
**Parameters:**
| Name | Type |
| ------ | ----------------------------------------- |
| `sink` | `impl ContextTraceSinkProtocol + 'static` |
### `noop`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn noop() -> Self
```
Create with no-op sink (zero overhead).
### `with_list_sink`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn with_list_sink() -> Self
```
Create with list sink.
### `emit`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn emit(&mut self, event: ContextEvent) -> ()
```
Emit an event.
**Parameters:**
| Name | Type |
| ------- | -------------- |
| `event` | `ContextEvent` |
### `events`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn events(&self) -> &[ContextEvent]
```
Get events.
### `clear`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn clear(&mut self) -> ()
```
Clear events.
### `agent_start`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn agent_start(&mut self, agent_id: &str, agent_name: &str, input: &str) -> ()
```
Emit agent start event.
**Parameters:**
| Name | Type |
| ------------ | ------ |
| `agent_id` | `&str` |
| `agent_name` | `&str` |
| `input` | `&str` |
### `agent_end`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn agent_end(&mut self, agent_id: &str, agent_name: &str, output: &str, duration_ms: u64) -> ()
```
Emit agent end event.
**Parameters:**
| Name | Type |
| ------------- | ------ |
| `agent_id` | `&str` |
| `agent_name` | `&str` |
| `output` | `&str` |
| `duration_ms` | `u64` |
### `tool_start`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn tool_start(&mut self, tool_name: &str, args: serde_json::Value) -> ()
```
Emit tool start event.
**Parameters:**
| Name | Type |
| ----------- | ------------------- |
| `tool_name` | `&str` |
| `args` | `serde_json::Value` |
### `tool_end`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn tool_end(&mut self, tool_name: &str, result: serde_json::Value, duration_ms: u64) -> ()
```
Emit tool end event.
**Parameters:**
| Name | Type |
| ------------- | ------------------- |
| `tool_name` | `&str` |
| `result` | `serde_json::Value` |
| `duration_ms` | `u64` |
## Source
`praisonai/src/trace/mod.rs` at line 629
***
## Related Documentation