fix(server): gracefully ignore MCP notifications (e.g. notifications/roots/list_changed) instead of returning a Method Not Found error that causes JSON-RPC clients to drop connections

server/src/handlers.rs

@@ -179,11 +179,19 @@ impl MemoryHandler {
                     }
                 }
             }
-            _ => Some(crate::mcp::error(
+            m if m.starts_with("notifications/") => None,
-                id,
+            "ping" => Some(crate::mcp::success(id, serde_json::json!({}))),
-                -32601,
+            _ => {
-                &format!("Method {} not found", method),
+                if id.is_null() {
-            )),
+                    None
+                } else {
+                    Some(crate::mcp::error(
+                        id,
+                        -32601,
+                        &format!("Method {} not found", method),
+                    ))
+                }
+            }
         }
     }
 }