diff --git a/server/src/handlers.rs b/server/src/handlers.rs
index 2818833..58b49e6 100644
--- a/server/src/handlers.rs
+++ b/server/src/handlers.rs
@@ -179,11 +179,19 @@ impl MemoryHandler {
                     }
                 }
             }
-            _ => Some(crate::mcp::error(
-                id,
-                -32601,
-                &format!("Method {} not found", method),
-            )),
+            m if m.starts_with("notifications/") => None,
+            "ping" => Some(crate::mcp::success(id, serde_json::json!({}))),
+            _ => {
+                if id.is_null() {
+                    None
+                } else {
+                    Some(crate::mcp::error(
+                        id,
+                        -32601,
+                        &format!("Method {} not found", method),
+                    ))
+                }
+            }
         }
     }
 }