feat: add memory management tools and utility commands

src/tool/utility/pong.rs

@@ -0,0 +1,35 @@
+use serde_json::{json, Value};
+use anyhow::Result;
+use super::super::Tool;
+use super::super::ToolCtx;
+
+pub struct Pong;
+
+impl Tool for Pong {
+    fn name(&self) -> &'static str {
+        "pong"
+    }
+
+    fn description(&self) -> &'static str {
+        "Simple connectivity check. Echoes back any input for health checks and latency testing."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "message": {
+                    "type": "string",
+                    "description": "Message to echo back"
+                }
+            }
+        })
+    }
+
+    fn run(&self, _ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let msg = args.get("message")
+            .and_then(|v| v.as_str())
+            .unwrap_or("pong");
+        Ok(format!("pong: {}", msg))
+    }
+}