# 快速开始
5 分钟跑起你的第一个 phi-agent。
## 前置条件
- [Rust](https://rustup.rs)(stable,edition 2024)
- 一个 LLM API Key(兼容 OpenAI 接口)
## 安装
```bash
cargo install phi-agent
```
## 方式一:REPL 交互(推荐)
```bash
phi init my-agent
cd my-agent
cp .env.example .env
# 编辑 .env,填入你的 LLM_API_KEY=sk-xxx
cargo run
```
## 方式二:库集成
```bash
phi init --lib my-agent
cd my-agent
cp .env.example .env
# 编辑 .env,填入你的 LLM_API_KEY=sk-xxx
cargo run
```
```
phi> 现在几点了?
🔧 get_time
当前时间:2025-07-30 19:30:00
phi> /exit
```
打开 `src/main.rs`,你会看到三部分:
**1. 定义工具** — 实现 `Tool` trait,告诉 Agent 这个工具叫什么、能干什么:
```rust
struct ClockTool;
#[async_trait]
impl Tool for ClockTool {
fn name(&self) -> &'static str { "get_time" }
fn definition(&self) -> Value {
json!({
"type": "function",
"function": {
"name": "get_time",
"description": "获取当前日期和时间",
"parameters": { "type": "object", "properties": {} }
}
})
}
async fn call(&self, _args: &Value, _ctx: &ToolContext) -> AgentResult<ToolOutput> {
let now = chrono::Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
Ok(ToolOutput {
summary: format!("当前时间:{}", now),
control_flow: ToolControlFlow::Continue,
raw: None, truncation: None,
})
}
}
```
**2. 注册工具** — 把工具挂到 Agent 上:
```rust
let agent = PhiAgent::build(
base_agent_builder(llm)
.system_prompt(build_system_prompt())
.register_tool(ClockTool), // ← 这里注册
PhiAgentConfig { ... },
)?;
```
**3. REPL** — 交互对话,Agent 自动决定何时调用工具。
照着 `ClockTool` 写你自己的工具就行。[自定义工具](custom-tool.md) 里有更多示例。
## 方式二:库集成
把 phi-agent 作为库加入已有项目:
```bash
cargo new my-agent && cd my-agent
cargo add phi-agent tokio --features full anyhow dotenvy async-trait serde_json chrono rustyline
echo 'LLM_API_KEY=sk-your-key-here' > .env
```
然后复制以下代码到 `src/main.rs`:
```rust
use phi_agent::{
base_agent_builder, build_system_prompt,
PhiAgent, PhiAgentConfig, OpenAiClient,
SafetyConfig, ReasoningEffort,
OutputFormat, create_stdout_renderer,
AgentResult, Tool, ToolContext, ToolControlFlow, ToolOutput,
};
use async_trait::async_trait;
use rustyline::DefaultEditor;
use serde_json::{Value, json};
use std::sync::Arc;
// ── ClockTool ──
struct ClockTool;
#[async_trait]
impl Tool for ClockTool {
fn name(&self) -> &'static str { "get_time" }
fn definition(&self) -> Value {
json!({
"type": "function",
"function": {
"name": "get_time",
"description": "获取当前日期和时间",
"parameters": { "type": "object", "properties": {} }
}
})
}
async fn call(&self, _args: &Value, _ctx: &ToolContext) -> AgentResult<ToolOutput> {
let now = chrono::Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
Ok(ToolOutput {
summary: format!("当前时间:{}", now),
control_flow: ToolControlFlow::Continue,
raw: None, truncation: None,
})
}
}
// ── REPL ──
#[tokio::main]
async fn main() -> anyhow::Result<()> {
dotenvy::dotenv().ok();
let model = std::env::var("LLM_MODEL").unwrap_or_else(|_| "gpt-4o".into());
let llm = Arc::new(OpenAiClient::new(
std::env::var("LLM_API_KEY")?,
model.clone(),
std::env::var("LLM_BASE_URL").ok(),
));
let agent = PhiAgent::build(
base_agent_builder(llm)
.system_prompt(build_system_prompt())
.register_tool(ClockTool),
PhiAgentConfig {
model,
enable_thinking: true,
thinking_budget: None,
thinking_effort: ReasoningEffort::Medium,
safety: SafetyConfig::default(),
},
)?;
let mut rl = DefaultEditor::new()?;
let mut renderer = create_stdout_renderer(&OutputFormat::Terminal {
show_thinking: true, show_tool_args: true, color: true,
});
println!("phi-agent REPL — type /exit to quit\n");
loop {
let line = rl.readline("phi> ")?;
let input = line.trim().to_string();
if input.is_empty() { continue; }
if input == "/exit" { break; }
rl.add_history_entry(&input)?;
let session = agent.create_session().await;
agent.run_turn(session, &input, |event| renderer.render(event)).await?;
println!();
}
}
```
三步:定义 Tool → 注册到 Agent → REPL 交互。
```bash
cargo run
```
```
phi> 现在几点了?
🔧 get_time
当前时间:2025-07-30 19:30:00
phi> /exit
```