Streaming - PraisonAI

Display AI responses as they generate, creating a natural chat experience.

Quick Start

Enable Streaming

use praisonai::Agent;

let agent = Agent::new()
    .name("Assistant")
    .instructions("You are helpful")
    .stream(true)  // Enable streaming
    .build()?;

agent.chat("Tell me a story").await?;
// Response appears word by word

Disable Streaming

use praisonai::Agent;

let agent = Agent::new()
    .name("Assistant")
    .stream(false)  // Wait for complete response
    .build()?;

How It Works

Stream Events

Events emitted during streaming.

Event	Description
`RequestStart`	API call initiated
`HeadersReceived`	HTTP headers arrived
`FirstToken`	First content (TTFT marker)
`DeltaText`	Text content chunk
`DeltaToolCall`	Tool call in progress
`ToolCallEnd`	Tool call complete
`LastToken`	Final content chunk
`StreamEnd`	Stream completed
`Error`	Error occurred

Configuration

Option	Type	Default	Description
`stream`	`bool`	`true`	Enable response streaming

Best Practices

Enable for chat interfaces

Streaming provides immediate feedback, improving perceived performance.

Disable for batch processing

When processing many requests, disable streaming for efficiency.

Agent

Agent configuration

Callbacks

Handle stream events

​Quick Start

​How It Works

​Stream Events

​Configuration

​Best Practices

​Related