message_cli/
message_cli.rs

1//! # Message CLI Example
2//!
3//! This example demonstrates a simple command-line interface for interacting with Claude.
4//! It creates a conversation loop where the user can chat with the AI assistant.
5//!
6//! ## Features
7//!
8//! - Initializes with a system-like message to set the assistant's behavior
9//! - Maintains conversation history for context
10//! - Simple command-line interface for user input
11//!
12//! ## Usage
13//!
14//! Run this example with:
15//!
16//! ```bash
17//! cargo run --example message_cli
18//! ```
19//!
20//! Make sure you have set the `ANTHROPIC_API_KEY` environment variable.
21
22use anthropic_api::{messages::*, Credentials};
23use std::io::{stdin, stdout, Write};
24
25#[tokio::main]
26async fn main() {
27    // Load .env file containing ANTHROPIC_API_KEY
28    let credentials = Credentials::from_env();
29
30    let mut messages = vec![Message {
31        role: MessageRole::User,
32        content: MessageContent::Text(
33            "You are a helpful AI assistant. Please introduce yourself briefly.".to_string(),
34        ),
35    }];
36
37    // Create initial message request
38    let response = MessagesAPI::builder("claude-3-7-sonnet-20250219", messages.clone(), 1024)
39        .credentials(credentials.clone())
40        .create()
41        .await
42        .unwrap();
43
44    // Print assistant's response
45    if let Some(content) = response.content.first() {
46        match content {
47            ResponseContentBlock::Text { text } => {
48                println!("Assistant: {}", text.trim());
49                messages.push(Message {
50                    role: MessageRole::Assistant,
51                    content: MessageContent::Text(text.clone()),
52                });
53            }
54            _ => {}
55        }
56    }
57
58    // Start conversation loop
59    loop {
60        print!("User: ");
61        stdout().flush().unwrap();
62
63        let mut user_input = String::new();
64        stdin().read_line(&mut user_input).unwrap();
65
66        // Add user message
67        messages.push(Message {
68            role: MessageRole::User,
69            content: MessageContent::Text(user_input),
70        });
71
72        // Send message request
73        let response = MessagesAPI::builder("claude-3-7-sonnet-20250219", messages.clone(), 1024)
74            .credentials(credentials.clone())
75            .create()
76            .await
77            .unwrap();
78
79        // Print assistant's response
80        if let Some(content) = response.content.first() {
81            match content {
82                ResponseContentBlock::Text { text } => {
83                    println!("Assistant: {}", text.trim());
84                    messages.push(Message {
85                        role: MessageRole::Assistant,
86                        content: MessageContent::Text(text.clone()),
87                    });
88                }
89                _ => {}
90            }
91        }
92    }
93}
message_cli/message_cli.rs

message_cli/
message_cli.rs
