diff --git a/server/utils/adminAlerts.js b/server/utils/adminAlerts.js
index 8b5cb17..adb1ffa 100644
--- a/server/utils/adminAlerts.js
+++ b/server/utils/adminAlerts.js
@@ -34,6 +34,86 @@ export function computeSignature(ids) {
   return hash.digest('hex')
 }
 
-// Alert functions land here in tasks 4–7.
+function memberItem(member, sublabel) {
+  return {
+    id: String(member._id),
+    label: member.name,
+    sublabel: sublabel ?? member.email,
+    href: `/admin/members/${member._id}`
+  }
+}
+
+export async function detectSlackInviteFailed() {
+  await connectDB()
+  const members = await Member
+    .find({ slackInviteStatus: 'failed' })
+    .select('name email')
+    .lean()
+  return {
+    type: 'slack_invite_failed',
+    severity: 'critical',
+    title: 'Slack invites failed',
+    items: members.map((m) => memberItem(m))
+  }
+}
+
+export async function detectNoSlackHandleAfterWeek() {
+  await connectDB()
+  const cutoff = daysAgo(ALERT_THRESHOLDS.NO_SLACK_DAYS)
+  const members = await Member
+    .find({
+      status: 'active',
+      createdAt: { $lte: cutoff },
+      $or: [
+        { slackUserId: { $exists: false } },
+        { slackUserId: null },
+        { slackUserId: '' }
+      ]
+    })
+    .select('name email createdAt')
+    .lean()
+  return {
+    type: 'no_slack_handle_week',
+    severity: 'attention',
+    title: 'Active members without a Slack handle',
+    items: members.map((m) =>
+      memberItem(m, `${daysSince(m.createdAt)} days since joining`)
+    )
+  }
+}
+
+export async function detectStuckPendingPayment() {
+  await connectDB()
+  const cutoff = daysAgo(ALERT_THRESHOLDS.STUCK_PAYMENT_DAYS)
+  const members = await Member
+    .find({
+      status: 'pending_payment',
+      createdAt: { $lte: cutoff }
+    })
+    .select('name email createdAt')
+    .lean()
+  return {
+    type: 'stuck_pending_payment',
+    severity: 'attention',
+    title: 'Members stuck in pending payment',
+    items: members.map((m) =>
+      memberItem(m, `${daysSince(m.createdAt)} days stuck`)
+    )
+  }
+}
+
+export async function detectSuspendedMembers() {
+  await connectDB()
+  const members = await Member
+    .find({ status: 'suspended' })
+    .select('name email')
+    .lean()
+  return {
+    type: 'member_suspended',
+    severity: 'attention',
+    title: 'Suspended members',
+    items: members.map((m) => memberItem(m))
+  }
+}
 
 // Aggregator lands in task 8.
diff --git a/tests/server/utils/adminAlerts.test.js b/tests/server/utils/adminAlerts.test.js
index bbcea8c..7f1fa27 100644
--- a/tests/server/utils/adminAlerts.test.js
+++ b/tests/server/utils/adminAlerts.test.js
@@ -46,7 +46,15 @@ vi.mock('../../../server/models/adminAlertDismissal.js', () => ({
   ]
 }))
 
-import { ALERT_THRESHOLDS, computeSignature } from '../../../server/utils/adminAlerts.js'
+import {
+  ALERT_THRESHOLDS,
+  computeSignature,
+  detectSlackInviteFailed,
+  detectNoSlackHandleAfterWeek,
+  detectStuckPendingPayment,
+  detectSuspendedMembers
+} from '../../../server/utils/adminAlerts.js'
+import Member from '../../../server/models/member.js'
 
 describe('adminAlerts module shell', () => {
   describe('ALERT_THRESHOLDS', () => {
@@ -83,4 +91,106 @@ describe('adminAlerts module shell', () => {
         .toBe(computeSignature(['x', 'y']))
     })
   })
+
+  describe('member alerts', () => {
+    beforeEach(() => {
+      vi.clearAllMocks()
+    })
+
+    function mockMemberFind(result) {
+      Member.find.mockReturnValue({
+        select: vi.fn().mockReturnValue({
+          lean: vi.fn().mockResolvedValue(result)
+        })
+      })
+    }
+
+    describe('detectSlackInviteFailed', () => {
+      it('returns matching members with critical severity', async () => {
+        mockMemberFind([
+          { _id: 'm1', name: 'Alex', email: 'alex@example.com' },
+          { _id: 'm2', name: 'Bea', email: 'bea@example.com' }
+        ])
+
+        const alert = await detectSlackInviteFailed()
+
+        expect(alert.type).toBe('slack_invite_failed')
+        expect(alert.severity).toBe('critical')
+        expect(alert.items).toHaveLength(2)
+        expect(alert.items[0]).toEqual({
+          id: 'm1',
+          label: 'Alex',
+          sublabel: 'alex@example.com',
+          href: '/admin/members/m1'
+        })
+        expect(Member.find).toHaveBeenCalledWith(
+          { slackInviteStatus: 'failed' }
+        )
+      })
+
+      it('returns an empty list when nothing matches', async () => {
+        mockMemberFind([])
+        const alert = await detectSlackInviteFailed()
+        expect(alert.items).toEqual([])
+      })
+    })
+
+    describe('detectNoSlackHandleAfterWeek', () => {
+      it('queries active members joined more than 7 days ago without a slackUserId', async () => {
+        mockMemberFind([
+          { _id: 'm3', name: 'Cam', email: 'cam@example.com', createdAt: new Date(Date.now() - 9 * 86400000) }
+        ])
+
+        const alert = await detectNoSlackHandleAfterWeek()
+
+        expect(alert.type).toBe('no_slack_handle_week')
+        expect(alert.severity).toBe('attention')
+        expect(alert.items).toHaveLength(1)
+        expect(alert.items[0].sublabel).toMatch(/9 days/)
+
+        const [query] = Member.find.mock.calls[0]
+        expect(query.status).toBe('active')
+        expect(query.createdAt).toEqual({ $lte: expect.any(Date) })
+        // slackUserId condition: missing or empty
+        expect(query.$or).toEqual([
+          { slackUserId: { $exists: false } },
+          { slackUserId: null },
+          { slackUserId: '' }
+        ])
+      })
+    })
+
+    describe('detectStuckPendingPayment', () => {
+      it('returns members in pending_payment older than 7 days', async () => {
+        mockMemberFind([
+          { _id: 'm4', name: 'Dee', email: 'dee@example.com', createdAt: new Date(Date.now() - 10 * 86400000) }
+        ])
+
+        const alert = await detectStuckPendingPayment()
+
+        expect(alert.type).toBe('stuck_pending_payment')
+        expect(alert.severity).toBe('attention')
+        expect(alert.items[0].sublabel).toMatch(/10 days/)
+
+        const [query] = Member.find.mock.calls[0]
+        expect(query.status).toBe('pending_payment')
+        expect(query.createdAt).toEqual({ $lte: expect.any(Date) })
+      })
+    })
+
+    describe('detectSuspendedMembers', () => {
+      it('returns suspended members', async () => {
+        mockMemberFind([
+          { _id: 'm5', name: 'Eli', email: 'eli@example.com' }
+        ])
+
+        const alert = await detectSuspendedMembers()
+
+        expect(alert.type).toBe('member_suspended')
+        expect(alert.severity).toBe('attention')
+        expect(alert.items).toHaveLength(1)
+        expect(Member.find).toHaveBeenCalledWith({ status: 'suspended' })
+      })
+    })
+  })
 })