diff --git a/apps/desktop/src/plugins/hermes-bots/group-rounds.ts b/apps/desktop/src/plugins/hermes-bots/group-rounds.ts
index da258c7474..759dc35739 100644
--- a/apps/desktop/src/plugins/hermes-bots/group-rounds.ts
+++ b/apps/desktop/src/plugins/hermes-bots/group-rounds.ts
@@ -19,6 +19,7 @@ import {
 import type { GroupChatRoom, GroupHoldStamp } from './group-chat'
 import { durableGroupChatMembers, followGroupChat, groupMemberKey } from './group-membership'
 import { runGroupContinuationMembers, runGroupRoundMember } from './group-round-members'
+import { rejectGroupSlashCommand } from './group-slash'
 import { harvestStrandedGroupReply } from './group-turns'
 import { requestForBot } from './routing'
 import type { Attachment, GroupMember, GroupMessage } from './types'
@@ -662,6 +663,11 @@ export function sendToGroupChat(
   images?: Attachment[]
 ): null | string {
   const trimmed = String(text || '').trim()
+
+  if (rejectGroupSlashCommand(trimmed)) {
+    return null
+  }
+
   const attached = Array.isArray(images) ? images.filter((img: Attachment) => img && img.data) : []
 
   if ((!trimmed && !attached.length) || !members.length) {
diff --git a/apps/desktop/src/plugins/hermes-bots/group-slash.test.ts b/apps/desktop/src/plugins/hermes-bots/group-slash.test.ts
new file mode 100644
index 0000000000..467c3776f5
--- /dev/null
+++ b/apps/desktop/src/plugins/hermes-bots/group-slash.test.ts
@@ -0,0 +1,95 @@
+import { afterEach, beforeEach, expect, it, vi } from 'vitest'
+
+import { createGroupGateway, drain, runTimersInline, scriptedStorage } from './group-test-utils'
+import type { Attachment, GroupMember } from './types'
+
+const { host } = vi.hoisted(() => ({ host: {} as Record<string, unknown> }))
+
+vi.mock('@hermes/plugin-sdk', async () => {
+  const { pluginSdkMock } = await import('./group-test-utils')
+
+  return pluginSdkMock(host)
+})
+
+const MEMBERS: GroupMember[] = [
+  { name: 'research', title: '' },
+  { name: 'builder', title: '' }
+]
+
+const IMAGE: Attachment = { data: 'data:image/png;base64,iVBORw0KGgo=', kind: 'image', name: 'screenshot.png' }
+
+async function loadRoom() {
+  vi.resetModules()
+  const gateway = createGroupGateway()
+  Object.assign(host, gateway.host)
+
+  const [chat, rounds, shared] = await Promise.all([
+    import('./group-chat'),
+    import('./group-rounds'),
+    import('./shared')
+  ])
+
+  shared.setPluginCtx(scriptedStorage(gateway.storage))
+
+  return { chat, rounds, gateway }
+}
+
+beforeEach(() => runTimersInline())
+afterEach(() => vi.unstubAllGlobals())
+
+it('rejects command-shaped sends visibly without changing the room or reaching a member, even with attachments', async () => {
+  const { chat, rounds, gateway } = await loadRoom()
+  const thread = rounds.sendToGroupChat('Team', MEMBERS, 'Ready')
+  await drain(() => Boolean(chat.$groupChats.get().Team?.running))
+  chat.$groupNeedsYou.set({ Team: true })
+
+  const before = structuredClone(chat.$groupChats.get())
+  const needsYou = chat.$groupNeedsYou.get()
+  const storage = structuredClone(gateway.storage)
+  gateway.rpc.length = 0
+  gateway.calls.length = 0
+  gateway.attaches.length = 0
+
+  for (const text of ['/new', '  /ReSeT  ', '/custom-skill argument', '/custom_skill\nargument']) {
+    for (const target of [null, thread]) {
+      for (const attachments of [[], [IMAGE]]) {
+        const draftAttachments = structuredClone(attachments)
+        vi.mocked(host.notify as ReturnType<typeof vi.fn>).mockClear()
+
+        expect(rounds.sendToGroupChat('Team', MEMBERS, text, target, attachments)).toBeNull()
+        await drain(() => Boolean(chat.$groupChats.get().Team?.running))
+
+        expect(host.notify).toHaveBeenCalledExactlyOnceWith({
+          kind: 'warning',
+          message: expect.stringMatching(/slash commands.*group chats/i)
+        })
+        expect(chat.$groupChats.get()).toEqual(before)
+        expect(chat.$groupNeedsYou.get()).toBe(needsYou)
+        expect(gateway.storage).toEqual(storage)
+        expect(gateway.rpc).toEqual([])
+        expect(gateway.calls).toEqual([])
+        expect(gateway.attaches).toEqual([])
+        expect(attachments).toEqual(draftAttachments)
+      }
+    }
+  }
+})
+
+it('sends path-first text and embedded slash commands to the room members with attachments intact', async () => {
+  const { chat, rounds, gateway } = await loadRoom()
+
+  for (const text of ['/etc/hosts', '/tmp/report.txt inspect this', 'Explain /new', '/']) {
+    gateway.calls.length = 0
+    gateway.attaches.length = 0
+
+    const thread = rounds.sendToGroupChat('Team', MEMBERS, text, null, [IMAGE])
+    expect(thread).toEqual(expect.any(String))
+    await drain(() => Boolean(chat.$groupChats.get().Team?.running))
+
+    expect(chat.$groupChats.get().Team.log).toContainEqual(expect.objectContaining({ text, thread, images: [IMAGE] }))
+    expect(gateway.calls.map(call => call.profile)).toEqual(MEMBERS.map(member => member.name))
+    expect(gateway.calls.every(call => call.prompt.includes(text))).toBe(true)
+    expect(gateway.attaches.map(call => call.data)).toEqual(MEMBERS.map(() => IMAGE.data))
+    expect(host.notify).not.toHaveBeenCalled()
+  }
+})
diff --git a/apps/desktop/src/plugins/hermes-bots/group-slash.ts b/apps/desktop/src/plugins/hermes-bots/group-slash.ts
new file mode 100644
index 0000000000..59b1560aa6
--- /dev/null
+++ b/apps/desktop/src/plugins/hermes-bots/group-slash.ts
@@ -0,0 +1,18 @@
+import { host } from '@hermes/plugin-sdk'
+
+import { botsText } from './i18n'
+
+/** Group rooms cannot dispatch slash commands. Keep command-shaped input out
+ * of member prompts without rejecting paths such as /etc/hosts. */
+export function rejectGroupSlashCommand(text: string): boolean {
+  if (!/^\/[a-z][\w-]*(?:\s|$)/i.test(text)) {
+    return false
+  }
+
+  host.notify({
+    kind: 'warning',
+    message: botsText().group.slashCommandsUnsupported
+  })
+
+  return true
+}
diff --git a/apps/desktop/src/plugins/hermes-bots/i18n.ts b/apps/desktop/src/plugins/hermes-bots/i18n.ts
index d0bd53e29e..d6b96cf348 100644
--- a/apps/desktop/src/plugins/hermes-bots/i18n.ts
+++ b/apps/desktop/src/plugins/hermes-bots/i18n.ts
@@ -163,6 +163,7 @@ type BotsMessages = {
     deleteTitle: string
     deleteAction: string
     composerPlaceholder: string
+    slashCommandsUnsupported: string
     attachHint: string
     newThread: string
     reply: string
@@ -387,6 +388,8 @@ const en: BotsMessages = {
     deleteTitle: 'Delete group chat?',
     deleteAction: 'Delete',
     composerPlaceholder: 'Say something — every bot in this group hears the room.',
+    slashCommandsUnsupported:
+      'Slash commands are not supported in group chats. Open an individual bot chat to use them.',
     attachHint: 'Attach files — every responding bot sees them',
     newThread: 'New Thread',
     reply: 'Reply',
@@ -604,6 +607,8 @@ const ja: BotsMessages = {
     deleteTitle: 'グループチャットを削除しますか？',
     deleteAction: '削除',
     composerPlaceholder: '何か書いてください — このグループのすべてのボットが部屋の内容を受け取ります。',
+    slashCommandsUnsupported:
+      'グループチャットではスラッシュコマンドを使用できません。個別のボットチャットを開いて使用してください。',
     attachHint: 'ファイルを添付 — 応答するすべてのボットが見ます',
     newThread: '新しいスレッド',
     reply: '返信',
@@ -817,6 +822,7 @@ const zh: BotsMessages = {
     deleteTitle: '删除群聊？',
     deleteAction: '删除',
     composerPlaceholder: '说点什么 — 这个群里的每个机器人都会听到。',
+    slashCommandsUnsupported: '群聊不支持斜杠命令。请打开单个机器人的聊天来使用。',
     attachHint: '附加文件 — 每个回应的机器人都能看到',
     newThread: '新帖子',
     reply: '回复',
@@ -1030,6 +1036,7 @@ const zhHant: BotsMessages = {
     deleteTitle: '刪除群組聊天？',
     deleteAction: '刪除',
     composerPlaceholder: '說點什麼 — 這個群組裡的每個機器人都會聽到。',
+    slashCommandsUnsupported: '群組聊天不支援斜線命令。請開啟個別機器人的聊天來使用。',
     attachHint: '附加檔案 — 每個回應的機器人都能看到',
     newThread: '新討論串',
     reply: '回覆',