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//! Example 10: Include Partial Messages
//!
//! This example demonstrates using the "include_partial_messages" option to stream
//! partial messages from Claude Code SDK.
//!
//! This feature allows you to receive stream events that contain incremental
//! updates as Claude generates responses. This is useful for:
//! - Building real-time UIs that show text as it's being generated
//! - Monitoring tool use progress
//! - Getting early results before the full response is complete
//!
//! Note: Partial message streaming requires the CLI to support it, and the
//! messages will include StreamEvent messages interspersed with regular messages.
use claude_agent_sdk::{ClaudeAgentOptions, ClaudeClient, Message};
use std::collections::HashMap;
#[tokio::main]
async fn main() -> anyhow::Result<()> {
println!("Partial Message Streaming Example");
println!("{}", "=".repeat(50));
// Enable partial message streaming
let mut env = HashMap::new();
env.insert("MAX_THINKING_TOKENS".to_string(), "8000".to_string());
let options = ClaudeAgentOptions {
include_partial_messages: true,
model: Some("claude-sonnet-4-5".to_string()),
max_turns: Some(2),
env,
..Default::default()
};
let mut client = ClaudeClient::new(options);
// Connect to the CLI
client.connect().await?;
// Send a prompt that will generate a streaming response
let prompt = "Think of three jokes, then tell one";
println!("Prompt: {}\n", prompt);
println!("{}", "=".repeat(50));
client.query(prompt).await?;
// Receive and display messages, including partial stream events
use futures::StreamExt;
let mut stream = client.receive_response();
while let Some(message) = stream.next().await {
match message? {
Message::StreamEvent(event) => {
println!("Stream Event: {:?}", event);
// You can access partial content as it arrives
// This is useful for real-time UI updates
},
Message::Assistant(msg) => {
for block in &msg.message.content {
if let claude_agent_sdk::ContentBlock::Text(text) = block {
println!("Claude: {}", text.text);
}
}
},
Message::Result(result) => {
println!("\n=== Result ===");
println!("Duration: {}ms", result.duration_ms);
println!("Turns: {}", result.num_turns);
if let Some(cost) = result.total_cost_usd {
println!("Cost: ${:.4}", cost);
}
break;
},
_ => {
// Other messages
},
}
}
drop(stream);
// Disconnect
client.disconnect().await?;
Ok(())
}