diff --git a/packages/bot/src/functions/music/commands/play/handlers/playHandler.ts b/packages/bot/src/functions/music/commands/play/handlers/playHandler.ts
index 13aa59043..85650e771 100644
--- a/packages/bot/src/functions/music/commands/play/handlers/playHandler.ts
+++ b/packages/bot/src/functions/music/commands/play/handlers/playHandler.ts
@@ -3,6 +3,7 @@ import type { PlayerNodeInitializationResult } from 'discord-player'
 import type { CommandExecuteParams } from '../../../../../types/CommandData'
 import { ENVIRONMENT_CONFIG } from '@lucky/shared/config'
 import { errorLog, debugLog, warnLog } from '@lucky/shared/utils'
+import { assertDefined } from '@lucky/shared/utils/guards'
 import { createErrorEmbed } from '../../../../../utils/general/embeds'
 import { interactionReply } from '../../../../../utils/general/interactionReply'
 import { createUserFriendlyError } from '@lucky/shared/utils/general/errorSanitizer'
@@ -44,7 +45,7 @@ export async function executePlayHandler({
     }
 
     const member = interaction.member as GuildMember
-    const voiceChannel = member.voice.channel!
+    const voiceChannel = assertDefined(member.voice.channel, 'Voice channel guaranteed by requireVoiceChannel check')
 
     try {
         await interaction.deferReply()
@@ -88,7 +89,7 @@ export async function executePlayHandler({
             try {
                 const deferredMsg = await interaction.fetchReply()
                 registerNowPlayingMessage(
-                    interaction.guildId!,
+                    assertDefined(interaction.guildId, 'Guild ID guaranteed by requireGuild check'),
                     deferredMsg.id,
                     interaction.channelId,
                 )
@@ -213,7 +214,7 @@ export async function executePlayHandler({
         // single failure never silently skips the others (#1085).
         void runPostPlayBackgroundOps({
             queue,
-            guildId: interaction.guildId!,
+            guildId: assertDefined(interaction.guildId, 'Guild ID guaranteed by requireGuild check'),
             track,
             hadQueueBeforePlay,
             isPlaylist,
diff --git a/packages/bot/src/functions/music/commands/stop.spec.ts b/packages/bot/src/functions/music/commands/stop.spec.ts
index 15ecc4aa0..bd45d0f27 100644
--- a/packages/bot/src/functions/music/commands/stop.spec.ts
+++ b/packages/bot/src/functions/music/commands/stop.spec.ts
@@ -1,6 +1,7 @@
 import { beforeEach, describe, expect, it, jest } from '@jest/globals'
 import stopCommand from './stop'
 
+const requireGuildMock = jest.fn()
 const requireQueueMock = jest.fn()
 const requireDJRoleMock = jest.fn()
 const interactionReplyMock = jest.fn()
@@ -11,6 +12,7 @@ const deleteSnapshotMock = jest.fn()
 const clearSessionMoodCacheMock = jest.fn()
 
 jest.mock('../../../utils/command/commandValidations', () => ({
+    requireGuild: (...args: unknown[]) => requireGuildMock(...args),
     requireQueue: (...args: unknown[]) => requireQueueMock(...args),
     requireDJRole: (...args: unknown[]) => requireDJRoleMock(...args),
 }))
@@ -63,6 +65,7 @@ function createQueue(guildId = 'guild-1') {
 describe('stop command', () => {
     beforeEach(() => {
         jest.clearAllMocks()
+        requireGuildMock.mockResolvedValue(true)
         requireQueueMock.mockResolvedValue(true)
         requireDJRoleMock.mockResolvedValue(true)
         interactionReplyMock.mockResolvedValue(undefined)
@@ -145,6 +148,18 @@ describe('stop command', () => {
         expect(queue.delete).toHaveBeenCalled()
     })
 
+    it('returns early if guild check fails', async () => {
+        requireGuildMock.mockResolvedValue(false)
+
+        await stopCommand.execute({
+            interaction: createInteraction('guild-1'),
+            client: {} as any,
+        })
+
+        expect(requireQueueMock).not.toHaveBeenCalled()
+        expect(clearSessionMoodCacheMock).not.toHaveBeenCalled()
+    })
+
     it('returns early if queue check fails', async () => {
         resolveGuildQueueMock.mockReturnValue({ queue: null })
         requireQueueMock.mockResolvedValue(false)
diff --git a/packages/bot/src/functions/music/commands/stop.ts b/packages/bot/src/functions/music/commands/stop.ts
index 52c726dca..f46f54a64 100644
--- a/packages/bot/src/functions/music/commands/stop.ts
+++ b/packages/bot/src/functions/music/commands/stop.ts
@@ -4,6 +4,7 @@ import { interactionReply } from '../../../utils/general/interactionReply'
 import { clearSessionMoodCache } from '../../../utils/music/autoplay/replenisher'
 import type { CommandExecuteParams } from '../../../types/CommandData'
 import {
+    requireGuild,
     requireQueue,
     requireDJRole,
 } from '../../../utils/command/commandValidations'
@@ -11,6 +12,7 @@ import { resolveGuildQueue } from '../../../utils/music/queueResolver'
 import { createSuccessEmbed } from '../../../utils/general/embeds'
 import { musicWatchdogService } from '../../../utils/music/watchdog'
 import { musicSessionSnapshotService } from '../../../utils/music/sessionSnapshots'
+import { assertDefined } from '@lucky/shared/utils/guards'
 
 export default new Command({
     data: new SlashCommandBuilder()
@@ -18,10 +20,12 @@ export default new Command({
         .setDescription('⏹️ Stop playback and clear the queue.'),
     category: 'music',
     execute: async ({ client, interaction }: CommandExecuteParams) => {
+        if (!(await requireGuild(interaction))) return
+
         const { queue } = resolveGuildQueue(client, interaction.guildId ?? '')
 
         if (!(await requireQueue(queue, interaction))) return
-        if (!(await requireDJRole(interaction, interaction.guildId!))) return
+        if (!(await requireDJRole(interaction, assertDefined(interaction.guildId, 'Guild ID required after requireGuild check')))) return
 
         if (queue) {
             musicWatchdogService.markIntentionalStop(queue.guild.id)
diff --git a/packages/bot/src/functions/music/commands/volume.ts b/packages/bot/src/functions/music/commands/volume.ts
index 79292e83b..127158058 100644
--- a/packages/bot/src/functions/music/commands/volume.ts
+++ b/packages/bot/src/functions/music/commands/volume.ts
@@ -13,6 +13,7 @@ import {
 requireDJRole
 } from "../../../utils/command/commandValidations"
 import { resolveGuildQueue } from '../../../utils/music/queueResolver'
+import { assertDefined } from '@lucky/shared/utils/guards'
 
 /**
  * Validate volume value
@@ -78,7 +79,7 @@ export default new Command({
     category: 'music',
     execute: async ({ client, interaction }: CommandExecuteParams) => {
         if (!(await requireGuild(interaction))) return
-        if (!(await requireDJRole(interaction, interaction.guildId!))) return
+        if (!(await requireDJRole(interaction, assertDefined(interaction.guildId, 'Guild ID required after requireGuild check')))) return
 
         const { queue } = resolveGuildQueue(client, interaction.guildId ?? '')
         if (!(await requireQueue(queue, interaction))) return
diff --git a/packages/bot/src/functions/music/commands/voteskip.ts b/packages/bot/src/functions/music/commands/voteskip.ts
index 34a5ee964..32c78e4ae 100644
--- a/packages/bot/src/functions/music/commands/voteskip.ts
+++ b/packages/bot/src/functions/music/commands/voteskip.ts
@@ -20,6 +20,7 @@ import {
 } from '../../../utils/music/voteSkipStore'
 import { guildSettingsService } from '@lucky/shared/services'
 import { debugLog } from '@lucky/shared/utils'
+import { assertDefined } from '@lucky/shared/utils/guards'
 import type { GuildMember } from 'discord.js'
 
 const DEFAULT_THRESHOLD = 50
@@ -35,7 +36,7 @@ export default new Command({
     }: CommandExecuteParams): Promise<void> => {
         if (!(await requireGuild(interaction))) return
 
-        const guildId = interaction.guildId!
+        const guildId = assertDefined(interaction.guildId, 'Guild ID required after requireGuild check')
         const { queue } = resolveGuildQueue(client, guildId)
 
         if (!(await requireQueue(queue, interaction))) return
@@ -111,7 +112,7 @@ export default new Command({
 
         if (voteCount >= required) {
             clearVotes(guildId)
-            queue!.node.skip()
+            assertDefined(queue, 'Queue required after requireQueue check').node.skip()
             await interactionReply({
                 interaction,
                 content: {
diff --git a/packages/bot/src/handlers/message/autoModHandler.ts b/packages/bot/src/handlers/message/autoModHandler.ts
index dd76e3edb..d94ed97e5 100644
--- a/packages/bot/src/handlers/message/autoModHandler.ts
+++ b/packages/bot/src/handlers/message/autoModHandler.ts
@@ -1,6 +1,7 @@
 import type { Message } from 'discord.js'
 import { autoModService, moderationService } from '@lucky/shared/services'
 import { errorLog } from '@lucky/shared/utils'
+import { assertDefined } from '@lucky/shared/utils/guards'
 import type {
     MessageContext,
     MessageHandler,
@@ -112,12 +113,13 @@ export const autoModHandler: MessageHandler = {
 
             await message.delete().catch(() => {})
 
+            const clientUser = assertDefined(message.client.user, 'Client user guaranteed when bot is ready')
             const caseInput = {
                 guildId,
                 userId,
                 username: message.author.tag,
-                moderatorId: message.client.user!.id,
-                moderatorName: message.client.user!.tag,
+                moderatorId: clientUser.id,
+                moderatorName: clientUser.tag,
                 reason: `[AutoMod] ${violations[0].reason}`,
                 channelId: message.channelId,
             }
diff --git a/packages/bot/src/handlers/player/streamBridge.ts b/packages/bot/src/handlers/player/streamBridge.ts
index d560a6e02..0ec09cdc0 100644
--- a/packages/bot/src/handlers/player/streamBridge.ts
+++ b/packages/bot/src/handlers/player/streamBridge.ts
@@ -3,6 +3,7 @@ import { PassThrough } from 'stream'
 import type { Readable } from 'stream'
 import type { Track } from 'discord-player'
 import { errorLog, infoLog, warnLog, debugLog } from '@lucky/shared/utils'
+import { assertDefined } from '@lucky/shared/utils/guards'
 import {
     cleanTitle,
     cleanAuthor,
@@ -68,17 +69,17 @@ export function streamViaYtDlp(url: string): Promise<Readable> {
         }, 15_000)
 
         const stderrChunks: Buffer[] = []
-        proc.stderr!.on('data', (chunk: Buffer) => stderrChunks.push(chunk))
+        assertDefined(proc.stderr, 'stderr guaranteed by stdio config').on('data', (chunk: Buffer) => stderrChunks.push(chunk))
 
         let settled = false
 
-        proc.stdout!.once('data', (firstChunk: Buffer) => {
+        assertDefined(proc.stdout, 'stdout guaranteed by stdio config').once('data', (firstChunk: Buffer) => {
             if (settled) return
             settled = true
             clearTimeout(timeout)
             const through = new PassThrough()
             through.write(firstChunk)
-            proc.stdout!.pipe(through)
+            assertDefined(proc.stdout, 'stdout guaranteed by stdio config').pipe(through)
             resolve(through)
         })
 
diff --git a/packages/bot/src/spotify/spotifyApi.ts b/packages/bot/src/spotify/spotifyApi.ts
index e73670d47..90b552c7e 100644
--- a/packages/bot/src/spotify/spotifyApi.ts
+++ b/packages/bot/src/spotify/spotifyApi.ts
@@ -1,5 +1,6 @@
 import { logAndSwallow } from '@lucky/shared/utils/error'
 import { debugLog, warnLog } from '@lucky/shared/utils/general/log'
+import { assertDefined } from '@lucky/shared/utils/guards'
 
 export interface SpotifyRecommendationTrack {
     id: string
@@ -218,8 +219,8 @@ export async function getSpotifyRecommendations(
             return (data?.tracks ?? [])
                 .filter((t) => t.id && t.name)
                 .map((t) => ({
-                    id: t.id!,
-                    name: t.name!,
+                    id: assertDefined(t.id, 'Track ID guaranteed by filter'),
+                    name: assertDefined(t.name, 'Track name guaranteed by filter'),
                     artists: (t.artists ?? []).map((a) => ({
                         name: a.name ?? '',
                     })),
@@ -591,16 +592,16 @@ export async function getUserTopArtistsAndTracks(
         const artists: SpotifyTopArtist[] = (artistsData.items ?? [])
             .filter((a) => a.id && a.name)
             .map((a) => ({
-                id: a.id!,
-                name: a.name!,
+                id: assertDefined(a.id, 'Artist ID guaranteed by filter'),
+                name: assertDefined(a.name, 'Artist name guaranteed by filter'),
                 genres: a.genres ?? [],
             }))
 
         const tracks: SpotifyTopTrack[] = (tracksData.items ?? [])
             .filter((t) => t.id && t.name)
             .map((t) => ({
-                id: t.id!,
-                name: t.name!,
+                id: assertDefined(t.id, 'Track ID guaranteed by filter'),
+                name: assertDefined(t.name, 'Track name guaranteed by filter'),
                 artist: t.artists?.[0]?.name ?? 'Unknown',
             }))
 
diff --git a/packages/bot/src/utils/music/queueEditOps.ts b/packages/bot/src/utils/music/queueEditOps.ts
index 6d3226862..b8beb2b90 100644
--- a/packages/bot/src/utils/music/queueEditOps.ts
+++ b/packages/bot/src/utils/music/queueEditOps.ts
@@ -1,6 +1,7 @@
 import { type Track, type GuildQueue } from 'discord-player'
 import { randomInt } from 'node:crypto'
 import { debugLog, errorLog } from '@lucky/shared/utils'
+import { assertDefined } from '@lucky/shared/utils/guards'
 import { replenishQueue } from './autoplay/replenisher'
 import { markAsAutoplayTrack } from './autoplay/queueMarkers'
 
@@ -174,7 +175,7 @@ export function moveUserTrackToPriority(queue: GuildQueue, track: Track): void {
     const tracks = queue.tracks.toArray()
     let trackIndex = -1
     for (let i = tracks.length - 1; i >= 0; i--) {
-        const t = tracks[i]!
+        const t = assertDefined(tracks[i], 'Array index guaranteed by loop bounds')
         if (
             t === track ||
             (Boolean(track.id) && t.id === track.id) ||
@@ -202,7 +203,7 @@ export function moveUserTrackToPriority(queue: GuildQueue, track: Track): void {
         return
     }
 
-    const queuedTrack = tracks[trackIndex]!
+    const queuedTrack = assertDefined(tracks[trackIndex], 'Track index guaranteed by prior check')
 
     try {
         queue.node.remove(queuedTrack)