Declare command metadata and permission in plugin.yml, and stop /fly falling through to usage

CHANGELOG.md

@@ -8,6 +8,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 - `README.md` describing the plugin, its installation, its documentation, and how it is built and validated by hand.
+- `description` and `usage` metadata for the `Fly` command in `plugin.yml`.
+- A `permissions` block in `plugin.yml` declaring `FlyCommand.fly` with default `op`, matching the permission table in `USER_GUIDE.md`.
+
+### Fixed
+- The permission-denied branch of `/fly` now returns `true`, so the plugin's own alert is the only message a player without `FlyCommand.fly` is shown.
+- `onCommand` now carries the `@Override` annotation, matching `onEnable` and `onDisable`.
 
 ## [1.0]
 

me/Daniel/FlyCommand/Main.java

@@ -17,6 +17,7 @@ public void onDisable() {
 
 	}
 
+	@Override
 	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
 		if (label.equalsIgnoreCase("fly")) {
 			if (!(sender instanceof Player)) {
@@ -32,6 +33,7 @@ public boolean onCommand(CommandSender sender, Command command, String label, St
 				}
 				else {
 					player.sendMessage("Alert: Permission 'FlyCommand.fly' required.");
+					return true;
 				}
 			}
 		}

plugin.yml

@@ -4,4 +4,11 @@ version: 1.0
 api-version: 1.13
 
 commands:
-  Fly:
+  Fly:
+    description: Toggles flight mode on or off for the executing player.
+    usage: /<command>
+
+permissions:
+  FlyCommand.fly:
+    description: Allows the player to toggle flight.
+    default: op