diff --git a/TeamOctolings.Octobot/Commands/AboutCommandGroup.cs b/TeamOctolings.Octobot/Commands/AboutCommandGroup.cs
index 9f05af3..dbb8b12 100644
--- a/TeamOctolings.Octobot/Commands/AboutCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/AboutCommandGroup.cs
@@ -25,7 +25,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles the command to show information about this bot: /about.
 /// </summary>
 [UsedImplicitly]
-public class AboutCommandGroup : CommandGroup
+public sealed class AboutCommandGroup : CommandGroup
 {
     private static readonly (string Username, Snowflake Id)[] Developers =
     [
@@ -36,9 +36,9 @@ private static readonly (string Username, Snowflake Id)[] Developers =
 
     private readonly ICommandContext _context;
     private readonly IFeedbackService _feedback;
+    private readonly IDiscordRestGuildAPI _guildApi;
     private readonly GuildDataService _guildData;
     private readonly IDiscordRestUserAPI _userApi;
-    private readonly IDiscordRestGuildAPI _guildApi;
 
     public AboutCommandGroup(
         ICommandContext context, GuildDataService guildData,
diff --git a/TeamOctolings.Octobot/Commands/BanCommandGroup.cs b/TeamOctolings.Octobot/Commands/BanCommandGroup.cs
index 8d90286..69be80f 100644
--- a/TeamOctolings.Octobot/Commands/BanCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/BanCommandGroup.cs
@@ -26,7 +26,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles commands related to ban management: /ban and /unban.
 /// </summary>
 [UsedImplicitly]
-public class BanCommandGroup : CommandGroup
+public sealed class BanCommandGroup : CommandGroup
 {
     private readonly AccessControlService _access;
     private readonly IDiscordRestChannelAPI _channelApi;
diff --git a/TeamOctolings.Octobot/Commands/ClearCommandGroup.cs b/TeamOctolings.Octobot/Commands/ClearCommandGroup.cs
index 8a8cb2f..5eace0e 100644
--- a/TeamOctolings.Octobot/Commands/ClearCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/ClearCommandGroup.cs
@@ -23,7 +23,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles the command to clear messages in a channel: /clear.
 /// </summary>
 [UsedImplicitly]
-public class ClearCommandGroup : CommandGroup
+public sealed class ClearCommandGroup : CommandGroup
 {
     private readonly IDiscordRestChannelAPI _channelApi;
     private readonly ICommandContext _context;
@@ -116,7 +116,8 @@ private async Task<Result> ClearMessagesAsync(
             idList.Add(message.ID);
 
             var entry = logEntries[currentLogEntry];
-            var str = $"{string.Format(Messages.MessageFrom, Mention.User(message.Author))}\n{message.Content.InBlockCode()}";
+            var str =
+                $"{string.Format(Messages.MessageFrom, Mention.User(message.Author))}\n{message.Content.InBlockCode()}";
             if (entry.Builder.Length + str.Length > EmbedConstants.MaxDescriptionLength)
             {
                 logEntries.Add(entry = new ClearedMessageEntry());
diff --git a/TeamOctolings.Octobot/Commands/Events/ErrorLoggingPostExecutionEvent.cs b/TeamOctolings.Octobot/Commands/Events/ErrorLoggingPostExecutionEvent.cs
index 7ffc4fe..7409d3b 100644
--- a/TeamOctolings.Octobot/Commands/Events/ErrorLoggingPostExecutionEvent.cs
+++ b/TeamOctolings.Octobot/Commands/Events/ErrorLoggingPostExecutionEvent.cs
@@ -18,7 +18,7 @@ namespace TeamOctolings.Octobot.Commands.Events;
 ///     Handles error logging for slash command groups.
 /// </summary>
 [UsedImplicitly]
-public class ErrorLoggingPostExecutionEvent : IPostExecutionEvent
+public sealed class ErrorLoggingPostExecutionEvent : IPostExecutionEvent
 {
     private readonly IFeedbackService _feedback;
     private readonly ILogger<ErrorLoggingPostExecutionEvent> _logger;
diff --git a/TeamOctolings.Octobot/Commands/Events/LoggingPreparationErrorEvent.cs b/TeamOctolings.Octobot/Commands/Events/LoggingPreparationErrorEvent.cs
index 10a6a1f..9e69a7f 100644
--- a/TeamOctolings.Octobot/Commands/Events/LoggingPreparationErrorEvent.cs
+++ b/TeamOctolings.Octobot/Commands/Events/LoggingPreparationErrorEvent.cs
@@ -11,7 +11,7 @@ namespace TeamOctolings.Octobot.Commands.Events;
 ///     Handles error logging for slash commands that couldn't be successfully prepared.
 /// </summary>
 [UsedImplicitly]
-public class LoggingPreparationErrorEvent : IPreparationErrorEvent
+public sealed class LoggingPreparationErrorEvent : IPreparationErrorEvent
 {
     private readonly ILogger<LoggingPreparationErrorEvent> _logger;
 
diff --git a/TeamOctolings.Octobot/Commands/InfoCommandGroup.cs b/TeamOctolings.Octobot/Commands/InfoCommandGroup.cs
index 65ddd53..d7798f3 100644
--- a/TeamOctolings.Octobot/Commands/InfoCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/InfoCommandGroup.cs
@@ -23,7 +23,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles info commands: /userinfo, /guildinfo.
 /// </summary>
 [UsedImplicitly]
-public class InfoCommandGroup : CommandGroup
+public sealed class InfoCommandGroup : CommandGroup
 {
     private readonly ICommandContext _context;
     private readonly IFeedbackService _feedback;
diff --git a/TeamOctolings.Octobot/Commands/KickCommandGroup.cs b/TeamOctolings.Octobot/Commands/KickCommandGroup.cs
index 4252232..a8fea2a 100644
--- a/TeamOctolings.Octobot/Commands/KickCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/KickCommandGroup.cs
@@ -22,7 +22,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles the command to kick members of a guild: /kick.
 /// </summary>
 [UsedImplicitly]
-public class KickCommandGroup : CommandGroup
+public sealed class KickCommandGroup : CommandGroup
 {
     private readonly AccessControlService _access;
     private readonly IDiscordRestChannelAPI _channelApi;
diff --git a/TeamOctolings.Octobot/Commands/MuteCommandGroup.cs b/TeamOctolings.Octobot/Commands/MuteCommandGroup.cs
index 8e449f7..282afe8 100644
--- a/TeamOctolings.Octobot/Commands/MuteCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/MuteCommandGroup.cs
@@ -26,7 +26,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles commands related to mute management: /mute and /unmute.
 /// </summary>
 [UsedImplicitly]
-public class MuteCommandGroup : CommandGroup
+public sealed class MuteCommandGroup : CommandGroup
 {
     private readonly AccessControlService _access;
     private readonly ICommandContext _context;
diff --git a/TeamOctolings.Octobot/Commands/PingCommandGroup.cs b/TeamOctolings.Octobot/Commands/PingCommandGroup.cs
index 70b9f23..01a1ee2 100644
--- a/TeamOctolings.Octobot/Commands/PingCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/PingCommandGroup.cs
@@ -22,7 +22,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles the command to get the time taken for the gateway to respond to the last heartbeat: /ping
 /// </summary>
 [UsedImplicitly]
-public class PingCommandGroup : CommandGroup
+public sealed class PingCommandGroup : CommandGroup
 {
     private readonly IDiscordRestChannelAPI _channelApi;
     private readonly DiscordGatewayClient _client;
diff --git a/TeamOctolings.Octobot/Commands/RemindCommandGroup.cs b/TeamOctolings.Octobot/Commands/RemindCommandGroup.cs
index f40ba6b..e709296 100644
--- a/TeamOctolings.Octobot/Commands/RemindCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/RemindCommandGroup.cs
@@ -25,13 +25,19 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles commands to manage reminders: /remind, /listremind, /delremind
 /// </summary>
 [UsedImplicitly]
-public class RemindCommandGroup : CommandGroup
+public sealed class RemindCommandGroup : CommandGroup
 {
+    public enum Parameters
+    {
+        [UsedImplicitly] Time,
+        [UsedImplicitly] Text
+    }
+
     private readonly IInteractionCommandContext _context;
     private readonly IFeedbackService _feedback;
     private readonly GuildDataService _guildData;
-    private readonly IDiscordRestUserAPI _userApi;
     private readonly IDiscordRestInteractionAPI _interactionApi;
+    private readonly IDiscordRestUserAPI _userApi;
 
     public RemindCommandGroup(
         IInteractionCommandContext context, GuildDataService guildData, IFeedbackService feedback,
@@ -75,10 +81,12 @@ public async Task<Result> ExecuteListReminderAsync()
         var data = await _guildData.GetData(guildId, CancellationToken);
         Messages.Culture = GuildSettings.Language.Get(data.Settings);
 
-        return await ListRemindersAsync(data.GetOrCreateMemberData(executorId), guildId, executor, bot, CancellationToken);
+        return await ListRemindersAsync(data.GetOrCreateMemberData(executorId), guildId, executor, bot,
+            CancellationToken);
     }
 
-    private Task<Result> ListRemindersAsync(MemberData data, Snowflake guildId, IUser executor, IUser bot, CancellationToken ct)
+    private Task<Result> ListRemindersAsync(MemberData data, Snowflake guildId, IUser executor, IUser bot,
+        CancellationToken ct)
     {
         if (data.Reminders.Count == 0)
         {
@@ -93,10 +101,12 @@ private Task<Result> ListRemindersAsync(MemberData data, Snowflake guildId, IUse
         for (var i = 0; i < data.Reminders.Count; i++)
         {
             var reminder = data.Reminders[i];
-            builder.AppendBulletPointLine(string.Format(Messages.ReminderPosition, Markdown.InlineCode((i + 1).ToString())))
+            builder.AppendBulletPointLine(string.Format(Messages.ReminderPosition,
+                    Markdown.InlineCode((i + 1).ToString())))
                 .AppendSubBulletPointLine(string.Format(Messages.ReminderText, Markdown.InlineCode(reminder.Text)))
                 .AppendSubBulletPointLine(string.Format(Messages.ReminderTime, Markdown.Timestamp(reminder.At)))
-                .AppendSubBulletPointLine(string.Format(Messages.DescriptionActionJumpToMessage, $"https://discord.com/channels/{guildId.Value}/{reminder.ChannelId}/{reminder.MessageId}"));
+                .AppendSubBulletPointLine(string.Format(Messages.DescriptionActionJumpToMessage,
+                    $"https://discord.com/channels/{guildId.Value}/{reminder.ChannelId}/{reminder.MessageId}"));
         }
 
         var embed = new EmbedBuilder().WithSmallTitle(
@@ -120,8 +130,7 @@ private Task<Result> ListRemindersAsync(MemberData data, Snowflake guildId, IUse
     [RequireContext(ChannelContext.Guild)]
     [UsedImplicitly]
     public async Task<Result> ExecuteReminderAsync(
-        [Description("After what period of time mention the reminder (e.g. 1h30m)")]
-        [Option("in")]
+        [Description("After what period of time mention the reminder (e.g. 1h30m)")] [Option("in")]
         string timeSpanString,
         [Description("Reminder text")] [MaxLength(512)]
         string text)
@@ -166,7 +175,9 @@ private async Task<Result> AddReminderAsync(TimeSpan timeSpan, string text, Guil
     {
         var memberData = data.GetOrCreateMemberData(executor.ID);
         var remindAt = DateTimeOffset.UtcNow.Add(timeSpan);
-        var responseResult = await _interactionApi.GetOriginalInteractionResponseAsync(_context.Interaction.ApplicationID, _context.Interaction.Token, ct);
+        var responseResult =
+            await _interactionApi.GetOriginalInteractionResponseAsync(_context.Interaction.ApplicationID,
+                _context.Interaction.Token, ct);
         if (!responseResult.IsDefined(out var response))
         {
             return (Result)responseResult;
@@ -194,12 +205,6 @@ private async Task<Result> AddReminderAsync(TimeSpan timeSpan, string text, Guil
         return await _feedback.SendContextualEmbedResultAsync(embed, ct: ct);
     }
 
-    public enum Parameters
-    {
-        [UsedImplicitly] Time,
-        [UsedImplicitly] Text
-    }
-
     /// <summary>
     ///     A slash command that edits a scheduled reminder using the specified text or time.
     /// </summary>
diff --git a/TeamOctolings.Octobot/Commands/SettingsCommandGroup.cs b/TeamOctolings.Octobot/Commands/SettingsCommandGroup.cs
index 56584bf..0acaa88 100644
--- a/TeamOctolings.Octobot/Commands/SettingsCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/SettingsCommandGroup.cs
@@ -26,7 +26,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles the commands to list and modify per-guild settings: /settings and /settings list.
 /// </summary>
 [UsedImplicitly]
-public class SettingsCommandGroup : CommandGroup
+public sealed class SettingsCommandGroup : CommandGroup
 {
     /// <summary>
     ///     Represents all options as an array of objects implementing <see cref="IGuildOption" />.
diff --git a/TeamOctolings.Octobot/Commands/ToolsCommandGroup.cs b/TeamOctolings.Octobot/Commands/ToolsCommandGroup.cs
index 6af3040..b4c3488 100644
--- a/TeamOctolings.Octobot/Commands/ToolsCommandGroup.cs
+++ b/TeamOctolings.Octobot/Commands/ToolsCommandGroup.cs
@@ -22,7 +22,7 @@ namespace TeamOctolings.Octobot.Commands;
 ///     Handles tool commands: /random, /timestamp, /8ball.
 /// </summary>
 [UsedImplicitly]
-public class ToolsCommandGroup : CommandGroup
+public sealed class ToolsCommandGroup : CommandGroup
 {
     private static readonly TimestampStyle[] AllStyles =
     [
diff --git a/TeamOctolings.Octobot/Responders/GuildLoadedResponder.cs b/TeamOctolings.Octobot/Responders/GuildLoadedResponder.cs
index 0c71a06..cebb1ea 100644
--- a/TeamOctolings.Octobot/Responders/GuildLoadedResponder.cs
+++ b/TeamOctolings.Octobot/Responders/GuildLoadedResponder.cs
@@ -19,7 +19,7 @@ namespace TeamOctolings.Octobot.Responders;
 ///     has <see cref="GuildSettings.ReceiveStartupMessages" /> enabled
 /// </summary>
 [UsedImplicitly]
-public class GuildLoadedResponder : IResponder<IGuildCreate>
+public sealed class GuildLoadedResponder : IResponder<IGuildCreate>
 {
     private readonly IDiscordRestChannelAPI _channelApi;
     private readonly GuildDataService _guildData;
diff --git a/TeamOctolings.Octobot/Responders/GuildMemberJoinedResponder.cs b/TeamOctolings.Octobot/Responders/GuildMemberJoinedResponder.cs
index 6964fe7..c1f1da0 100644
--- a/TeamOctolings.Octobot/Responders/GuildMemberJoinedResponder.cs
+++ b/TeamOctolings.Octobot/Responders/GuildMemberJoinedResponder.cs
@@ -18,7 +18,7 @@ namespace TeamOctolings.Octobot.Responders;
 /// </summary>
 /// <seealso cref="GuildSettings.WelcomeMessage" />
 [UsedImplicitly]
-public class GuildMemberJoinedResponder : IResponder<IGuildMemberAdd>
+public sealed class GuildMemberJoinedResponder : IResponder<IGuildMemberAdd>
 {
     private readonly IDiscordRestChannelAPI _channelApi;
     private readonly IDiscordRestGuildAPI _guildApi;
diff --git a/TeamOctolings.Octobot/Responders/GuildMemberLeftResponder.cs b/TeamOctolings.Octobot/Responders/GuildMemberLeftResponder.cs
index 4f6150c..9774899 100644
--- a/TeamOctolings.Octobot/Responders/GuildMemberLeftResponder.cs
+++ b/TeamOctolings.Octobot/Responders/GuildMemberLeftResponder.cs
@@ -15,7 +15,7 @@ namespace TeamOctolings.Octobot.Responders;
 /// </summary>
 /// <seealso cref="GuildSettings.LeaveMessage" />
 [UsedImplicitly]
-public class GuildMemberLeftResponder : IResponder<IGuildMemberRemove>
+public sealed class GuildMemberLeftResponder : IResponder<IGuildMemberRemove>
 {
     private readonly IDiscordRestChannelAPI _channelApi;
     private readonly IDiscordRestGuildAPI _guildApi;
diff --git a/TeamOctolings.Octobot/Responders/GuildUnloadedResponder.cs b/TeamOctolings.Octobot/Responders/GuildUnloadedResponder.cs
index a4680d4..c73c134 100644
--- a/TeamOctolings.Octobot/Responders/GuildUnloadedResponder.cs
+++ b/TeamOctolings.Octobot/Responders/GuildUnloadedResponder.cs
@@ -12,7 +12,7 @@ namespace TeamOctolings.Octobot.Responders;
 ///     Handles removing guild ID from <see cref="GuildData" /> if the guild becomes unavailable.
 /// </summary>
 [UsedImplicitly]
-public class GuildUnloadedResponder : IResponder<IGuildDelete>
+public sealed class GuildUnloadedResponder : IResponder<IGuildDelete>
 {
     private readonly GuildDataService _guildData;
     private readonly ILogger<GuildUnloadedResponder> _logger;
diff --git a/TeamOctolings.Octobot/Responders/MessageDeletedResponder.cs b/TeamOctolings.Octobot/Responders/MessageDeletedResponder.cs
index 6b09b8d..88a8de2 100644
--- a/TeamOctolings.Octobot/Responders/MessageDeletedResponder.cs
+++ b/TeamOctolings.Octobot/Responders/MessageDeletedResponder.cs
@@ -18,7 +18,7 @@ namespace TeamOctolings.Octobot.Responders;
 ///     to a guild's <see cref="GuildSettings.PrivateFeedbackChannel" /> if one is set.
 /// </summary>
 [UsedImplicitly]
-public class MessageDeletedResponder : IResponder<IMessageDelete>
+public sealed class MessageDeletedResponder : IResponder<IMessageDelete>
 {
     private readonly IDiscordRestAuditLogAPI _auditLogApi;
     private readonly IDiscordRestChannelAPI _channelApi;
diff --git a/TeamOctolings.Octobot/Responders/MessageEditedResponder.cs b/TeamOctolings.Octobot/Responders/MessageEditedResponder.cs
index 6134214..2968562 100644
--- a/TeamOctolings.Octobot/Responders/MessageEditedResponder.cs
+++ b/TeamOctolings.Octobot/Responders/MessageEditedResponder.cs
@@ -20,7 +20,7 @@ namespace TeamOctolings.Octobot.Responders;
 ///     to a guild's <see cref="GuildSettings.PrivateFeedbackChannel" /> if one is set.
 /// </summary>
 [UsedImplicitly]
-public class MessageEditedResponder : IResponder<IMessageUpdate>
+public sealed class MessageEditedResponder : IResponder<IMessageUpdate>
 {
     private readonly CacheService _cacheService;
     private readonly IDiscordRestChannelAPI _channelApi;
diff --git a/TeamOctolings.Octobot/Responders/MessageReceivedResponder.cs b/TeamOctolings.Octobot/Responders/MessageReceivedResponder.cs
index 34a8f5c..24d53a5 100644
--- a/TeamOctolings.Octobot/Responders/MessageReceivedResponder.cs
+++ b/TeamOctolings.Octobot/Responders/MessageReceivedResponder.cs
@@ -11,7 +11,7 @@ namespace TeamOctolings.Octobot.Responders;
 ///     Handles sending replies to easter egg messages.
 /// </summary>
 [UsedImplicitly]
-public class MessageCreateResponder : IResponder<IMessageCreate>
+public sealed class MessageCreateResponder : IResponder<IMessageCreate>
 {
     private readonly IDiscordRestChannelAPI _channelApi;