diff --git a/src/app/actions/help.test.ts b/src/app/actions/help.test.ts
new file mode 100644
index 00000000..2f305550
--- /dev/null
+++ b/src/app/actions/help.test.ts
@@ -0,0 +1,155 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { sendHelpRequest } from './help';
+
+const mocks = vi.hoisted(() => ({
+  mockGetServerSupabase: vi.fn(),
+  mockGetUser: vi.fn(),
+  mockGetServiceSupabase: vi.fn(),
+  mockServiceFrom: vi.fn(),
+  mockInngestSend: vi.fn(),
+  mockRateLimit: vi.fn(),
+}));
+
+vi.mock('@/lib/supabase/server', () => ({
+  getServerSupabase: mocks.mockGetServerSupabase,
+}));
+
+vi.mock('@/lib/supabase/service', () => ({
+  getServiceSupabase: mocks.mockGetServiceSupabase,
+}));
+
+vi.mock('@/inngest/client', () => ({
+  inngest: { send: mocks.mockInngestSend },
+}));
+
+vi.mock('@/lib/rate-limit', () => ({
+  rateLimit: mocks.mockRateLimit,
+  RATE_LIMIT_TIERS: { HOURLY: { limit: 5, windowSec: 3600 } },
+}));
+
+vi.mock('next/cache', () => ({ revalidatePath: vi.fn() }));
+
+/** Build a chainable Supabase query mock with optional terminal result for .single(). */
+function makeChain(resolveValue?: unknown) {
+  const result = resolveValue ?? { data: null, error: null };
+  return {
+    select: vi.fn().mockReturnThis(),
+    insert: vi.fn().mockReturnThis(),
+    eq: vi.fn().mockReturnThis(),
+    gte: vi.fn().mockReturnThis(),
+    limit: vi.fn().mockReturnThis(),
+    single: vi.fn().mockResolvedValue(result),
+  };
+}
+
+describe('sendHelpRequest', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+    mocks.mockGetServerSupabase.mockReturnValue({
+      auth: { getUser: mocks.mockGetUser },
+    });
+    mocks.mockGetServiceSupabase.mockReturnValue({
+      from: mocks.mockServiceFrom,
+    });
+  });
+
+  it('rejects when server supabase not configured', async () => {
+    mocks.mockGetServerSupabase.mockReturnValue(null);
+
+    const result = await sendHelpRequest({ recId: 1, prUrl: 'help' });
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) expect(result.error.code).toBe('not_configured');
+  });
+
+  it('rejects when user not authenticated', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: null }, error: null });
+
+    const result = await sendHelpRequest({ recId: 1, prUrl: 'help' });
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) expect(result.error.code).toBe('not_authenticated');
+  });
+
+  it('rejects when rate limited', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({
+      ok: false,
+      resetAt: new Date('2026-07-10T12:00:00Z'),
+    });
+
+    const result = await sendHelpRequest({ recId: 1, prUrl: 'help' });
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) {
+      expect(result.error.code).toBe('rate_limited');
+      expect(result.error.resetAt).toBeDefined();
+    }
+  });
+
+  it('enforces cooldown for same PR URL within 4 hours', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+
+    // Cooldown query: .limit() returns existing help request → cooldown hit
+    const cooldownChain = makeChain();
+    cooldownChain.limit = vi.fn().mockResolvedValue({ data: [{ id: 99 }], error: null });
+    mocks.mockServiceFrom.mockReturnValueOnce(cooldownChain);
+
+    const result = await sendHelpRequest({
+      recId: 1,
+      prUrl: 'https://github.com/user/repo/pull/42',
+    });
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) expect(result.error.code).toBe('cooldown');
+  });
+
+  it('accepts plain text message and sends help request', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+    mocks.mockInngestSend.mockResolvedValue(undefined);
+
+    // Cooldown query: standard chain → .limit() returns chain → data is
+    // undefined → cooldown passes.
+    const cooldownChain = makeChain();
+    mocks.mockServiceFrom.mockReturnValueOnce(cooldownChain);
+
+    // Insert query: .single() resolves with the new row.
+    const insertChain = makeChain({ data: { id: 123 }, error: null });
+    mocks.mockServiceFrom.mockReturnValueOnce(insertChain);
+
+    const result = await sendHelpRequest({ recId: 1, prUrl: 'I need help' });
+
+    expect(result.ok).toBe(true);
+    if (result.ok) expect(result.data.helpRequestId).toBe(123);
+
+    expect(mocks.mockInngestSend).toHaveBeenCalledWith(
+      expect.objectContaining({ name: 'help/dispatch' }),
+    );
+  });
+
+  it('accepts valid GitHub PR URL', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+    mocks.mockInngestSend.mockResolvedValue(undefined);
+
+    const cooldownChain = makeChain();
+    mocks.mockServiceFrom.mockReturnValueOnce(cooldownChain);
+
+    const insertChain = makeChain({ data: { id: 456 }, error: null });
+    mocks.mockServiceFrom.mockReturnValueOnce(insertChain);
+
+    const prUrl = 'https://github.com/some-org/some-repo/pull/789';
+    const result = await sendHelpRequest({ recId: 1, prUrl });
+
+    expect(result.ok).toBe(true);
+    if (result.ok) expect(result.data.helpRequestId).toBe(456);
+
+    // Inngest payload must include the prUrl for valid GitHub URLs.
+    expect(mocks.mockInngestSend).toHaveBeenCalledWith({
+      name: 'help/dispatch',
+      data: { helpRequestId: 456, userId: 'user-1', prUrl },
+    });
+  });
+});
diff --git a/src/app/actions/streak.test.ts b/src/app/actions/streak.test.ts
new file mode 100644
index 00000000..6b6b594f
--- /dev/null
+++ b/src/app/actions/streak.test.ts
@@ -0,0 +1,161 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { getCurrentStreak, getPublicStreak } from './streak';
+
+const mocks = vi.hoisted(() => ({
+  mockGetServerSupabase: vi.fn(),
+  mockGetUser: vi.fn(),
+  mockGetServiceSupabase: vi.fn(),
+  mockServiceFrom: vi.fn(),
+  mockRateLimit: vi.fn(),
+  mockComputeStreak: vi.fn(),
+}));
+
+vi.mock('@/lib/supabase/server', () => ({
+  getServerSupabase: mocks.mockGetServerSupabase,
+}));
+
+vi.mock('@/lib/supabase/service', () => ({
+  getServiceSupabase: mocks.mockGetServiceSupabase,
+}));
+
+vi.mock('@/lib/rate-limit', () => ({
+  rateLimit: mocks.mockRateLimit,
+}));
+
+vi.mock('@/lib/xp/streak', () => ({
+  computeCurrentStreak: mocks.mockComputeStreak,
+}));
+
+/** Build a chainable Supabase query mock with optional terminal result for .single(). */
+function makeChain(resolveValue?: unknown) {
+  const result = resolveValue ?? { data: null, error: null };
+  return {
+    select: vi.fn().mockReturnThis(),
+    eq: vi.fn().mockReturnThis(),
+    gte: vi.fn().mockReturnThis(),
+    order: vi.fn().mockReturnThis(),
+    single: vi.fn().mockResolvedValue(result),
+  };
+}
+
+describe('getCurrentStreak', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+    mocks.mockGetServerSupabase.mockReturnValue({
+      auth: { getUser: mocks.mockGetUser },
+    });
+    mocks.mockGetServiceSupabase.mockReturnValue({
+      from: mocks.mockServiceFrom,
+    });
+  });
+
+  it('returns current streak for authenticated user', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+    mocks.mockComputeStreak.mockReturnValue(5);
+
+    // xp_events query ends with .order() — make it resolve with data.
+    const chain = makeChain();
+    chain.order = vi.fn().mockResolvedValue({
+      data: [{ created_at: '2026-07-09T10:00:00Z' }],
+      error: null,
+    });
+    mocks.mockServiceFrom.mockReturnValue(chain);
+
+    const result = await getCurrentStreak();
+
+    expect(result.days).toBe(5);
+    expect(mocks.mockComputeStreak).toHaveBeenCalledWith(
+      [{ created_at: '2026-07-09T10:00:00Z' }],
+      expect.stringMatching(/^\d{4}-\d{2}-\d{2}$/),
+    );
+  });
+
+  it('returns 0 when user has no activity', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+    mocks.mockComputeStreak.mockReturnValue(0);
+
+    const chain = makeChain();
+    chain.order = vi.fn().mockResolvedValue({ data: [], error: null });
+    mocks.mockServiceFrom.mockReturnValue(chain);
+
+    const result = await getCurrentStreak();
+
+    expect(result.days).toBe(0);
+    expect(mocks.mockComputeStreak).toHaveBeenCalledWith([], expect.any(String));
+  });
+
+  it('returns 0 when not authenticated', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: null }, error: null });
+
+    const result = await getCurrentStreak();
+
+    expect(result.days).toBe(0);
+    expect(mocks.mockRateLimit).not.toHaveBeenCalled();
+  });
+
+  it('returns 0 when rate limited', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: false });
+
+    const result = await getCurrentStreak();
+
+    expect(result.days).toBe(0);
+    expect(mocks.mockComputeStreak).not.toHaveBeenCalled();
+  });
+});
+
+describe('getPublicStreak', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+    mocks.mockGetServerSupabase.mockReturnValue({
+      auth: { getUser: mocks.mockGetUser },
+    });
+    mocks.mockGetServiceSupabase.mockReturnValue({
+      from: mocks.mockServiceFrom,
+    });
+  });
+
+  it('returns streak for any userId (anonymous)', async () => {
+    // Server supabase exists but user not authenticated → key = 'anon:' suffix.
+    mocks.mockGetUser.mockResolvedValue({ data: { user: null }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+    mocks.mockComputeStreak.mockReturnValue(3);
+
+    const chain = makeChain();
+    chain.order = vi.fn().mockResolvedValue({
+      data: [{ created_at: '2026-07-08T10:00:00Z' }],
+      error: null,
+    });
+    mocks.mockServiceFrom.mockReturnValue(chain);
+
+    const result = await getPublicStreak('other-user-id');
+
+    expect(result.days).toBe(3);
+    expect(mocks.mockRateLimit).toHaveBeenCalledWith(
+      expect.objectContaining({ key: 'anon:other-user-id' }),
+    );
+  });
+
+  it('uses authenticated user key when available', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'auth-user-id' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+    mocks.mockComputeStreak.mockReturnValue(7);
+
+    const chain = makeChain();
+    chain.order = vi.fn().mockResolvedValue({
+      data: [{ created_at: '2026-07-07T10:00:00Z' }],
+      error: null,
+    });
+    mocks.mockServiceFrom.mockReturnValue(chain);
+
+    const result = await getPublicStreak('other-user-id');
+
+    expect(result.days).toBe(7);
+    // When user is authenticated, rate limit key uses user.id, not the anon prefix.
+    expect(mocks.mockRateLimit).toHaveBeenCalledWith(
+      expect.objectContaining({ key: 'auth-user-id' }),
+    );
+  });
+});
diff --git a/src/app/actions/usage.test.ts b/src/app/actions/usage.test.ts
new file mode 100644
index 00000000..55a4c704
--- /dev/null
+++ b/src/app/actions/usage.test.ts
@@ -0,0 +1,191 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { getUsage } from './usage';
+
+const mocks = vi.hoisted(() => ({
+  mockGetServerSupabase: vi.fn(),
+  mockGetUser: vi.fn(),
+  mockGetServiceSupabase: vi.fn(),
+  mockServiceFrom: vi.fn(),
+  mockRateLimit: vi.fn(),
+}));
+
+vi.mock('@/lib/supabase/server', () => ({
+  getServerSupabase: mocks.mockGetServerSupabase,
+}));
+
+vi.mock('@/lib/supabase/service', () => ({
+  getServiceSupabase: mocks.mockGetServiceSupabase,
+}));
+
+vi.mock('@/lib/rate-limit', () => ({
+  rateLimit: mocks.mockRateLimit,
+}));
+
+vi.mock('next/cache', () => ({ revalidatePath: vi.fn() }));
+
+/** Build a chainable Supabase query mock with optional terminal result for .single(). */
+function makeChain(resolveValue?: unknown) {
+  const result = resolveValue ?? { data: null, error: null };
+  return {
+    select: vi.fn().mockReturnThis(),
+    eq: vi.fn().mockReturnThis(),
+    gte: vi.fn().mockReturnThis(),
+    order: vi.fn().mockReturnThis(),
+    limit: vi.fn().mockReturnThis(),
+    single: vi.fn().mockResolvedValue(result),
+  };
+}
+
+describe('getUsage', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+    mocks.mockGetServerSupabase.mockReturnValue({
+      auth: { getUser: mocks.mockGetUser },
+    });
+    mocks.mockGetServiceSupabase.mockReturnValue({
+      from: mocks.mockServiceFrom,
+    });
+  });
+
+  it('returns usage data for authenticated user', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+
+    // Three parallel queries: activity_log, xp_events (today), xp_events (week).
+    const logChain = makeChain();
+    logChain.limit = vi.fn().mockResolvedValue({
+      data: [
+        { id: 1, kind: 'review', detail: { pr: 42 }, created_at: '2026-07-10T10:00:00Z' },
+        { id: 2, kind: 'comment', detail: null, created_at: '2026-07-09T10:00:00Z' },
+      ],
+      error: null,
+    });
+
+    const todayChain = makeChain();
+    todayChain.gte = vi.fn().mockResolvedValue({
+      data: [{ xp_delta: 50 }, { xp_delta: 30 }],
+      error: null,
+    });
+
+    const weekChain = makeChain();
+    weekChain.gte = vi.fn().mockResolvedValue({
+      data: [{ xp_delta: 50 }, { xp_delta: 30 }, { xp_delta: 20 }],
+      error: null,
+    });
+
+    mocks.mockServiceFrom
+      .mockReturnValueOnce(logChain) // activity_log
+      .mockReturnValueOnce(todayChain) // xp_events today
+      .mockReturnValueOnce(weekChain); // xp_events week
+
+    const result = await getUsage();
+
+    expect(result.todayXp).toBe(80); // 50 + 30
+    expect(result.weekXp).toBe(100); // 50 + 30 + 20
+    expect(result.entries).toHaveLength(2);
+    expect(result.entries[0]).toEqual({
+      id: 1,
+      kind: 'review',
+      createdAt: '2026-07-10T10:00:00Z',
+      detail: { pr: 42 },
+    });
+  });
+
+  it('respects limit parameter', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+
+    const logChain = makeChain();
+    const limitSpy = vi.fn().mockResolvedValue({
+      data: [{ id: 1, kind: 'review', detail: null, created_at: '2026-07-10T10:00:00Z' }],
+      error: null,
+    });
+    logChain.limit = limitSpy;
+
+    const todayChain = makeChain();
+    todayChain.gte = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    const weekChain = makeChain();
+    weekChain.gte = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    mocks.mockServiceFrom
+      .mockReturnValueOnce(logChain)
+      .mockReturnValueOnce(todayChain)
+      .mockReturnValueOnce(weekChain);
+
+    await getUsage(5);
+
+    expect(limitSpy).toHaveBeenCalledWith(5);
+  });
+
+  it('returns empty entries when no activity', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+
+    const logChain = makeChain();
+    logChain.limit = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    const todayChain = makeChain();
+    todayChain.gte = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    const weekChain = makeChain();
+    weekChain.gte = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    mocks.mockServiceFrom
+      .mockReturnValueOnce(logChain)
+      .mockReturnValueOnce(todayChain)
+      .mockReturnValueOnce(weekChain);
+
+    const result = await getUsage();
+
+    expect(result.todayXp).toBe(0);
+    expect(result.weekXp).toBe(0);
+    expect(result.entries).toEqual([]);
+  });
+
+  it('returns empty summary when not authenticated', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: null }, error: null });
+
+    const result = await getUsage();
+
+    expect(result).toEqual({ todayXp: 0, weekXp: 0, entries: [] });
+    expect(mocks.mockRateLimit).not.toHaveBeenCalled();
+  });
+
+  it('returns empty when rate limited', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: false });
+
+    const result = await getUsage();
+
+    expect(result).toEqual({ todayXp: 0, weekXp: 0, entries: [] });
+    expect(mocks.mockServiceFrom).not.toHaveBeenCalled();
+  });
+
+  it('handles null detail in activity_log entries', async () => {
+    mocks.mockGetUser.mockResolvedValue({ data: { user: { id: 'user-1' } }, error: null });
+    mocks.mockRateLimit.mockResolvedValue({ ok: true });
+
+    const logChain = makeChain();
+    logChain.limit = vi.fn().mockResolvedValue({
+      data: [{ id: 1, kind: 'comment', detail: null, created_at: '2026-07-10T10:00:00Z' }],
+      error: null,
+    });
+
+    const todayChain = makeChain();
+    todayChain.gte = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    const weekChain = makeChain();
+    weekChain.gte = vi.fn().mockResolvedValue({ data: [], error: null });
+
+    mocks.mockServiceFrom
+      .mockReturnValueOnce(logChain)
+      .mockReturnValueOnce(todayChain)
+      .mockReturnValueOnce(weekChain);
+
+    const result = await getUsage();
+
+    expect(result.entries).toHaveLength(1);
+    expect(result.entries[0].detail).toBeNull();
+  });
+});