mod common;
use common::{build_facade_runner, print_run_result, ExampleConfig};
use serde::Deserialize;
use serde_json::json;
use vv_agent::{Agent, FunctionTool, ModelRef, ToolOutput};
#[derive(Deserialize)]
struct EchoArgs {
text: String,
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let config = ExampleConfig::load();
config.ensure_workspace()?;
let runner = build_facade_runner(&config)?;
let echo = FunctionTool::builder("echo_uppercase")
.description("Return the provided text uppercased.")
.json_schema(json!({
"type": "object",
"properties": {"text": {"type": "string"}},
"required": ["text"]
}))
.handler(
|_ctx, args: EchoArgs| async move { Ok(ToolOutput::text(args.text.to_uppercase())) },
)
.build()?;
let agent = Agent::builder("tool-demo")
.instructions("你必须调用 echo_uppercase，再用 task_finish 返回工具结果。")
.model(ModelRef::backend(
config.backend.clone(),
config.model.clone(),
))
.tool(echo)
.build()?;
let prompt = config
.prompt
.unwrap_or_else(|| "调用 echo_uppercase，text 为 vectorvein。".to_string());
let result = runner.run(&agent, prompt).await?;
print_run_result(&result)
}