# Pre-Context

Since a **context** is only created **after** a command is executed, you can't take full advantage of Brigadier's features like command requirements (who can see a command; it will say command not found and display red if the requirements are not met), or argument suggestions. That's where the pre-context comes in.

> A pre-context allows you to execute logic **before** your command is executed.

```java
addFormat("int:foo", context -> {
            if (!(context.getSender() instanceof final Player player)) {
                return;
            }
            final int foo = context.get("foo");
            final CommandSender sender = context.getSender();
            sender.sendMessage(player.getName());
            sender.sendMessage(Component.text(foo));
        }, pre -> {
            pre.setPredicate(sender -> sender.hasPermission("foo.bar.baz"));
            pre.addSuggestion("foo", sender -> IntStream.range(1, 10).mapToObj(value -> {
                return new Suggestion(String.valueOf(value));
            }).toList());
        });
```

The above code does the following:

* Add a requirement for the sender to have the permission "foo.bar.baz"
* Return a list of suggestions from an IntStream that will be showed as suggestions for this argument


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