feat: Add telemetry, timing, and detailed logging across server, stub, and nvim-core

server/src/handlers.rs

@@ -33,10 +33,23 @@ pub struct MemoryHandler {
 
 impl MemoryHandler {
     pub async fn handle_request(&self, req: serde_json::Value) -> Option<serde_json::Value> {
+        let start_time = std::time::Instant::now();
         let id = req.get("id").cloned().unwrap_or(serde_json::Value::Null);
+        let id_clone = id.clone();
         let method = req.get("method").and_then(|m| m.as_str()).unwrap_or("");
 
-        tracing::debug!(">>> [Server] Handling MCP request method: {}", method);
+        
+        let tool_name = if method == "tools/call" {
+            req.get("params").and_then(|p| p.get("name")).and_then(|n| n.as_str()).unwrap_or("unknown")
+        } else {
+            ""
+        };
+
+        if method == "tools/call" {
+            tracing::info!(">>> [Server] Handling MCP tool call: {} (id: {})", tool_name, id);
+        } else {
+            tracing::debug!(">>> [Server] Handling MCP request method: {}", method);
+        }
         tracing::trace!(">>> [Server] Full MCP Request payload: {}", req.to_string());
         let response = match method {
             "server/discover" => {
@@ -1648,6 +1661,17 @@ impl MemoryHandler {
             }
         };
 
+        let elapsed = start_time.elapsed();
+        if method == "tools/call" {
+            let is_error = response.as_ref().map_or(false, |r| r.get("error").is_some() || r.get("result").and_then(|res| res.get("isError")).and_then(|e| e.as_bool()).unwrap_or(false));
+            tracing::info!("<<< [Server] MCP tool call {} (id: {}) completed in {:?} [Error: {}]", tool_name, id_clone, elapsed, is_error);
+            
+            // Broadcast completion latency to the UI Activity Feed
+            let status_msg = if is_error { "with error" } else { "successfully" };
+            self.state.broadcast_activity(&format!("Tool {} completed {} in {:?}", tool_name, status_msg, elapsed));
+        } else {
+            tracing::debug!("<<< [Server] MCP request method {} completed in {:?}", method, elapsed);
+        }
         tracing::trace!("Returning response from handle_request: {:?}", response);
         response
     }