diff --git a/clap_builder/src/builder/debug_asserts.rs b/clap_builder/src/builder/debug_asserts.rs
index 7a7fd6ae183..b7bb1ff8329 100644
--- a/clap_builder/src/builder/debug_asserts.rs
+++ b/clap_builder/src/builder/debug_asserts.rs
@@ -300,6 +300,28 @@ pub(crate) fn assert_app(cmd: &Command) {
                 arg
             );
         }
+
+        for arg in &group.requires {
+            // Args listed inside groups should exist
+            assert!(
+                cmd.id_exists(arg),
+                "Command {}: Argument group '{}' requires non-existent '{}' id",
+                cmd.get_name(),
+                group.get_id(),
+                arg
+            );
+        }
+
+        for arg in &group.conflicts {
+            // Args listed inside groups should exist
+            assert!(
+                cmd.id_exists(arg),
+                "Command {}: Argument group '{}' conflicts with non-existent '{}' id",
+                cmd.get_name(),
+                group.get_id(),
+                arg
+            );
+        }
     }
 
     // Conflicts between flags and subcommands
diff --git a/clap_builder/src/output/usage.rs b/clap_builder/src/output/usage.rs
index dd99c63c7b7..87bb945283d 100644
--- a/clap_builder/src/output/usage.rs
+++ b/clap_builder/src/output/usage.rs
@@ -439,7 +439,7 @@ impl<'cmd> Usage<'cmd> {
                 required_groups.insert(elem);
                 required_groups_members.extend(group_members);
             } else {
-                debug_assert!(self.cmd.find(req).is_some());
+                debug_assert!(self.cmd.find(req).is_some(), "`{req}` must exist");
             }
         }