Refactor tool execution pipeline

tools/web_search/src/main.rs

@@ -0,0 +1,22 @@
+fn main() {
+    let input: serde_json::Value = serde_json::from_reader(std::io::stdin()).unwrap();
+    if input.get("response").is_none() && input.get("db_response").is_none() {
+        let q = input["params"]["query"].as_str().unwrap_or("");
+        if q.is_empty() { println!(r#"{{"type":"result","content":"缺少query"}}"#); return; }
+        let n = input["params"]["max_results"].as_u64().unwrap_or(5);
+        let body = serde_json::json!({"query":q,"max_results":n,"include_answer":true});
+        println!("{}", serde_json::json!({
+            "type":"http","method":"POST","url":"https://api.tavily.com/search",
+            "body":body.to_string(),"desc":format!("搜索: {q}")
+        }));
+    } else {
+        let b = &input["response"]["body"];
+        let mut o = String::new();
+        if let Some(a) = b["answer"].as_str() { o.push_str(&format!("📝 {a}\n\n")); }
+        for (i,r) in b["results"].as_array().unwrap_or(&vec![]).iter().enumerate() {
+            o.push_str(&format!("{}. {} - {}\n", i+1, r["title"].as_str().unwrap_or(""), r["url"].as_str().unwrap_or("")));
+        }
+        if o.is_empty() { o = "未找到结果".into(); }
+        println!("{}", serde_json::json!({"type":"result","content":o}));
+    }
+}