diff --git a/frontend/package.json b/frontend/package.json
index 1f7e91f..2da9cbc 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -13,6 +13,9 @@
     "format:check": "prettier --check \"src/**/*.{ts,tsx,css,json,html}\""
   },
   "dependencies": {
+    "@dnd-kit/core": "^6.1.0",
+    "@dnd-kit/sortable": "^8.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
     "@fontsource/ibm-plex-sans": "^5.0.20",
     "@fontsource/jetbrains-mono": "^5.0.20",
     "@tanstack/react-query": "^5.51.0",
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index db48353..44f8731 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -6,6 +6,8 @@ import { RequireAdmin } from '@/components/RequireAdmin';
 import { RequireAuth } from '@/components/RequireAuth';
 import { AdminGroupsPage } from '@/pages/AdminGroupsPage';
 import { AdminInvitationsPage } from '@/pages/AdminInvitationsPage';
+import { AdminScenariosPage } from '@/pages/AdminScenariosPage';
+import { AdminTestsPage } from '@/pages/AdminTestsPage';
 import { AdminUsersPage } from '@/pages/AdminUsersPage';
 import { HomePage } from '@/pages/HomePage';
 import { MitrePage } from '@/pages/MitrePage';
@@ -82,6 +84,22 @@ function App() {
                   </RequireAdmin>
                 }
               />
+              <Route
+                path="/admin/tests"
+                element={
+                  <RequireAdmin>
+                    <AdminTestsPage />
+                  </RequireAdmin>
+                }
+              />
+              <Route
+                path="/admin/scenarios"
+                element={
+                  <RequireAdmin>
+                    <AdminScenariosPage />
+                  </RequireAdmin>
+                }
+              />
               <Route path="*" element={<Navigate to="/" replace />} />
             </Route>
           </Routes>
diff --git a/frontend/src/components/Layout.tsx b/frontend/src/components/Layout.tsx
index 0eab999..a9b269b 100644
--- a/frontend/src/components/Layout.tsx
+++ b/frontend/src/components/Layout.tsx
@@ -42,6 +42,8 @@ export function Layout() {
                     {navItem('/admin/users', 'Users')}
                     {navItem('/admin/groups', 'Groups')}
                     {navItem('/admin/invitations', 'Invitations')}
+                    {navItem('/admin/tests', 'Tests')}
+                    {navItem('/admin/scenarios', 'Scenarios')}
                   </>
                 )}
                 <span className="font-mono text-2xs text-text-dim ml-2" data-testid="me-email">
@@ -69,7 +71,7 @@ export function Layout() {
         <Outlet />
 
         <footer className="mt-[60px] py-8 border-t border-border text-center font-mono text-xs text-text-dim">
-          metamorph · M0 bootstrap · M1 db schema · M2 auth · M3 rbac · M4 mitre · design system from tasks/design.md
+          metamorph · M0 bootstrap · M1 db schema · M2 auth · M3 rbac · M4 mitre · M5 templates · design system from tasks/design.md
         </footer>
       </div>
     </div>
diff --git a/frontend/src/components/MarkdownField.tsx b/frontend/src/components/MarkdownField.tsx
new file mode 100644
index 0000000..635793a
--- /dev/null
+++ b/frontend/src/components/MarkdownField.tsx
@@ -0,0 +1,45 @@
+import { useId, type TextareaHTMLAttributes } from 'react';
+
+import { cn } from '@/lib/cn';
+
+interface MarkdownFieldProps extends Omit<TextareaHTMLAttributes<HTMLTextAreaElement>, 'value' | 'onChange'> {
+  label: string;
+  value: string;
+  onChange: (next: string) => void;
+  rows?: number;
+  hint?: string;
+}
+
+/**
+ * Markdown-content textarea. We deliberately keep it textarea-only (no fancy
+ * WYSIWYG editor) — markdown lives well in plain text and the saved blob is
+ * rendered to HTML at display time (M6/M7 mission pages). The label exposes
+ * "markdown" so the user knows the field accepts MD syntax.
+ */
+export function MarkdownField({ label, value, onChange, rows = 6, hint, id, className, ...rest }: MarkdownFieldProps) {
+  const fallbackId = useId();
+  const inputId = id ?? fallbackId;
+  return (
+    <div className="block">
+      <label
+        htmlFor={inputId}
+        className="block font-mono text-3xs font-semibold uppercase tracking-wider2 text-text-dim"
+      >
+        {label} <span className="text-text-dim/60">· markdown</span>
+      </label>
+      <textarea
+        id={inputId}
+        rows={rows}
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        className={cn(
+          'mt-1 w-full rounded-md border border-border bg-bg-card px-3 py-2 font-mono text-xs text-text-bright placeholder:text-text-dim',
+          'focus:border-cyan focus:outline-none',
+          className,
+        )}
+        {...rest}
+      />
+      {hint && <p className="mt-1 font-mono text-2xs text-text-dim">{hint}</p>}
+    </div>
+  );
+}
diff --git a/frontend/src/lib/templates.ts b/frontend/src/lib/templates.ts
new file mode 100644
index 0000000..faabcb8
--- /dev/null
+++ b/frontend/src/lib/templates.ts
@@ -0,0 +1,136 @@
+/**
+ * Shared types + query-key factory for the M5 template catalogue.
+ *
+ * Two resources: `test_templates` (atomic test units) and `scenario_templates`
+ * (ordered lists of tests). Both back the admin pages and feed the M6 mission
+ * wizard.
+ */
+
+import type { MitreTagKind } from './mitre';
+
+export type OpsecLevel = 'low' | 'medium' | 'high';
+
+export interface MitreTagOut {
+  kind: MitreTagKind;
+  external_id: string;
+  name: string;
+  url: string | null;
+}
+
+export interface MitreTagInWire {
+  kind: MitreTagKind;
+  external_id: string;
+}
+
+export interface TestTemplate {
+  id: string;
+  name: string;
+  description: string | null;
+  objective: string | null;
+  procedure_md: string | null;
+  prerequisites_md: string | null;
+  expected_result_red_md: string | null;
+  expected_detection_blue_md: string | null;
+  opsec_level: OpsecLevel;
+  tags: string[];
+  expected_iocs: string[];
+  mitre_tags: MitreTagOut[];
+  deleted_at: string | null;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface TestTemplateListResponse {
+  items: TestTemplate[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
+export interface CreateTestTemplatePayload {
+  name: string;
+  description?: string | null;
+  objective?: string | null;
+  procedure_md?: string | null;
+  prerequisites_md?: string | null;
+  expected_result_red_md?: string | null;
+  expected_detection_blue_md?: string | null;
+  opsec_level?: OpsecLevel;
+  tags?: string[];
+  expected_iocs?: string[];
+  mitre_tags?: MitreTagInWire[];
+}
+
+export type UpdateTestTemplatePayload = Partial<CreateTestTemplatePayload>;
+
+export interface ScenarioTest {
+  position: number;
+  test_template_id: string;
+  test_template_name: string;
+  test_template_deleted: boolean;
+}
+
+export interface ScenarioTemplate {
+  id: string;
+  name: string;
+  description: string | null;
+  tests: ScenarioTest[];
+  tests_count: number;
+  deleted_at: string | null;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface ScenarioTemplateListResponse {
+  items: ScenarioTemplate[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
+export interface CreateScenarioPayload {
+  name: string;
+  description?: string | null;
+  test_template_ids?: string[];
+}
+
+export interface UpdateScenarioPayload {
+  name?: string;
+  description?: string | null;
+}
+
+export interface SetScenarioTestsPayload {
+  test_template_ids: string[];
+}
+
+export interface TestTemplateFilters {
+  q?: string;
+  tactic?: string;
+  technique?: string;
+  subtechnique?: string;
+  opsec?: OpsecLevel | '';
+  tag?: string;
+}
+
+export const templateKeys = {
+  // Test templates
+  tests: (filters?: TestTemplateFilters) =>
+    ['templates', 'tests', filters ?? {}] as const,
+  test: (id: string) => ['templates', 'tests', id] as const,
+  // Scenario templates
+  scenarios: (q?: string) => ['templates', 'scenarios', q ?? ''] as const,
+  scenario: (id: string) => ['templates', 'scenarios', id] as const,
+};
+
+export function buildTestQueryString(filters: TestTemplateFilters | undefined): string {
+  if (!filters) return '';
+  const params = new URLSearchParams();
+  if (filters.q) params.set('q', filters.q);
+  if (filters.tactic) params.set('tactic', filters.tactic);
+  if (filters.technique) params.set('technique', filters.technique);
+  if (filters.subtechnique) params.set('subtechnique', filters.subtechnique);
+  if (filters.opsec) params.set('opsec', filters.opsec);
+  if (filters.tag) params.set('tag', filters.tag);
+  const s = params.toString();
+  return s ? `?${s}` : '';
+}
diff --git a/frontend/src/pages/AdminScenariosPage.tsx b/frontend/src/pages/AdminScenariosPage.tsx
new file mode 100644
index 0000000..e8c5901
--- /dev/null
+++ b/frontend/src/pages/AdminScenariosPage.tsx
@@ -0,0 +1,434 @@
+import {
+  DndContext,
+  KeyboardSensor,
+  PointerSensor,
+  closestCenter,
+  useSensor,
+  useSensors,
+  type DragEndEvent,
+} from '@dnd-kit/core';
+import {
+  SortableContext,
+  arrayMove,
+  sortableKeyboardCoordinates,
+  useSortable,
+  verticalListSortingStrategy,
+} from '@dnd-kit/sortable';
+import { CSS } from '@dnd-kit/utilities';
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import { useMemo, useState } from 'react';
+
+import { Alert } from '@/components/ui/Alert';
+import { Button } from '@/components/ui/Button';
+import { Card } from '@/components/ui/Card';
+import { Modal } from '@/components/ui/Modal';
+import { SectionHeader } from '@/components/ui/SectionHeader';
+import { Tag } from '@/components/ui/Tag';
+import { TextField } from '@/components/ui/TextField';
+import {
+  ApiError,
+  apiDelete,
+  apiGet,
+  apiPatch,
+  apiPost,
+  apiPut,
+} from '@/lib/api';
+import {
+  templateKeys,
+  type CreateScenarioPayload,
+  type ScenarioTemplate,
+  type ScenarioTemplateListResponse,
+  type TestTemplate,
+  type TestTemplateListResponse,
+} from '@/lib/templates';
+
+interface FormState {
+  name: string;
+  description: string;
+  test_ids: string[];
+}
+
+function blankForm(): FormState {
+  return { name: '', description: '', test_ids: [] };
+}
+
+function toForm(sc: ScenarioTemplate): FormState {
+  return {
+    name: sc.name,
+    description: sc.description ?? '',
+    test_ids: sc.tests.map((t) => t.test_template_id),
+  };
+}
+
+function useScenarios(q: string) {
+  return useQuery({
+    queryKey: templateKeys.scenarios(q),
+    queryFn: () =>
+      apiGet<ScenarioTemplateListResponse>(
+        `/scenario-templates${q ? `?q=${encodeURIComponent(q)}` : ''}`,
+      ),
+  });
+}
+
+function useTestCatalogue() {
+  return useQuery({
+    queryKey: templateKeys.tests({}),
+    queryFn: () => apiGet<TestTemplateListResponse>('/test-templates?limit=500'),
+  });
+}
+
+interface SortableTestRowProps {
+  id: string;
+  index: number;
+  name: string;
+  onRemove: () => void;
+}
+
+function SortableTestRow({ id, index, name, onRemove }: SortableTestRowProps) {
+  const { attributes, listeners, setNodeRef, transform, transition, isDragging } = useSortable({ id });
+  const style = {
+    transform: CSS.Transform.toString(transform),
+    transition,
+    opacity: isDragging ? 0.5 : 1,
+  };
+  return (
+    <li
+      ref={setNodeRef}
+      style={style}
+      className="flex items-center gap-2 rounded-md border border-border bg-bg-card px-3 py-2"
+      data-testid={`scenario-test-row-${id}`}
+    >
+      <button
+        type="button"
+        {...attributes}
+        {...listeners}
+        className="cursor-grab font-mono text-text-dim hover:text-text-bright active:cursor-grabbing"
+        aria-label={`Drag ${name}`}
+        data-testid={`drag-handle-${id}`}
+      >
+        ☰
+      </button>
+      <span className="font-mono text-2xs text-text-dim w-6">{String(index + 1).padStart(2, '0')}</span>
+      <span className="font-mono text-xs text-text-bright flex-1">{name}</span>
+      <Button variant="ghost" accent="rose" onClick={onRemove} aria-label={`Remove ${name}`}>
+        ✕
+      </Button>
+    </li>
+  );
+}
+
+export function AdminScenariosPage() {
+  const qc = useQueryClient();
+  const [q, setQ] = useState('');
+  const [creating, setCreating] = useState(false);
+  const [editing, setEditing] = useState<ScenarioTemplate | null>(null);
+  const [form, setForm] = useState<FormState>(blankForm());
+  const [error, setError] = useState<string | null>(null);
+
+  const scenarios = useScenarios(q);
+  const catalogue = useTestCatalogue();
+
+  const sensors = useSensors(
+    useSensor(PointerSensor, { activationConstraint: { distance: 5 } }),
+    useSensor(KeyboardSensor, { coordinateGetter: sortableKeyboardCoordinates }),
+  );
+
+  const create = useMutation({
+    mutationFn: (payload: CreateScenarioPayload) =>
+      apiPost<ScenarioTemplate>('/scenario-templates', payload),
+    onSuccess: async () => {
+      setCreating(false);
+      setForm(blankForm());
+      setError(null);
+      await qc.invalidateQueries({ queryKey: ['templates', 'scenarios'] });
+    },
+    onError: (e) => setError(humanError(e)),
+  });
+
+  const updateMeta = useMutation({
+    mutationFn: ({ id, name, description }: { id: string; name: string; description: string | null }) =>
+      apiPatch<ScenarioTemplate>(`/scenario-templates/${id}`, { name, description }),
+  });
+
+  const setTests = useMutation({
+    mutationFn: ({ id, test_template_ids }: { id: string; test_template_ids: string[] }) =>
+      apiPut<ScenarioTemplate>(`/scenario-templates/${id}/tests`, { test_template_ids }),
+  });
+
+  const remove = useMutation({
+    mutationFn: (id: string) => apiDelete<{ ok: boolean }>(`/scenario-templates/${id}`),
+    onSuccess: async () => {
+      await qc.invalidateQueries({ queryKey: ['templates', 'scenarios'] });
+    },
+  });
+
+  function openCreate() {
+    setForm(blankForm());
+    setError(null);
+    setCreating(true);
+  }
+
+  function openEdit(sc: ScenarioTemplate) {
+    setForm(toForm(sc));
+    setError(null);
+    setEditing(sc);
+  }
+
+  function onDragEnd(e: DragEndEvent) {
+    const { active, over } = e;
+    if (!over || active.id === over.id) return;
+    setForm((f) => {
+      const from = f.test_ids.indexOf(String(active.id));
+      const to = f.test_ids.indexOf(String(over.id));
+      if (from < 0 || to < 0) return f;
+      return { ...f, test_ids: arrayMove(f.test_ids, from, to) };
+    });
+  }
+
+  async function submit() {
+    setError(null);
+    if (!form.name.trim()) {
+      setError('Name is required.');
+      return;
+    }
+    try {
+      if (editing) {
+        // Two-step: metadata first, then ordered tests.
+        await updateMeta.mutateAsync({
+          id: editing.id,
+          name: form.name.trim(),
+          description: form.description || null,
+        });
+        await setTests.mutateAsync({ id: editing.id, test_template_ids: form.test_ids });
+      } else {
+        await create.mutateAsync({
+          name: form.name.trim(),
+          description: form.description || null,
+          test_template_ids: form.test_ids,
+        });
+      }
+      await qc.invalidateQueries({ queryKey: ['templates', 'scenarios'] });
+      setEditing(null);
+      setCreating(false);
+    } catch (e) {
+      setError(humanError(e));
+    }
+  }
+
+  const isModalOpen = creating || editing !== null;
+
+  const testNameById = useMemo(() => {
+    const map = new Map<string, string>();
+    catalogue.data?.items.forEach((t) => map.set(t.id, t.name));
+    return map;
+  }, [catalogue.data]);
+
+  // Tests available for inclusion (excluding already-picked + soft-deleted).
+  const availableTests = useMemo<TestTemplate[]>(() => {
+    if (!catalogue.data) return [];
+    const picked = new Set(form.test_ids);
+    return catalogue.data.items.filter((t) => !picked.has(t.id) && !t.deleted_at);
+  }, [catalogue.data, form.test_ids]);
+
+  return (
+    <>
+      <SectionHeader
+        prefix="Admin"
+        highlight="Scenarios"
+        accent="purple"
+        description="Ordered playbooks composed from the test catalogue. Drag rows to reorder; the order is the execution sequence."
+      />
+
+      <div className="mb-6 flex flex-wrap items-end gap-3">
+        <TextField
+          label="Search"
+          value={q}
+          onChange={(e) => setQ(e.target.value)}
+          placeholder="name or description"
+          data-testid="scenarios-search"
+        />
+        <Button accent="purple" onClick={openCreate} data-testid="create-scenario" className="ml-auto">
+          + New scenario
+        </Button>
+      </div>
+
+      {scenarios.isError && <Alert accent="red">Failed to load scenarios.</Alert>}
+
+      <div className="grid gap-3" data-testid="scenarios-list">
+        {scenarios.isLoading && <p className="font-mono text-xs text-text-dim">Loading…</p>}
+        {scenarios.data?.items.map((sc) => (
+          <Card
+            key={sc.id}
+            accent="purple"
+            title={sc.name}
+            sub={sc.description ?? '—'}
+            data-testid={`scenario-row-${sc.id}`}
+          >
+            <div className="flex flex-wrap items-center gap-2">
+              <Tag accent="purple">{sc.tests_count} test{sc.tests_count === 1 ? '' : 's'}</Tag>
+              {sc.tests.slice(0, 4).map((t) => (
+                <Tag key={`${sc.id}:${t.position}`} accent={t.test_template_deleted ? 'rose' : 'cyan'}>
+                  {t.position + 1}. {t.test_template_name}
+                </Tag>
+              ))}
+              {sc.tests.length > 4 && (
+                <Tag accent="yellow">+{sc.tests.length - 4} more</Tag>
+              )}
+              <div className="ml-auto flex gap-2">
+                <Button accent="purple" onClick={() => openEdit(sc)} data-testid={`edit-scenario-${sc.id}`}>
+                  Edit
+                </Button>
+                <Button
+                  accent="rose"
+                  variant="ghost"
+                  onClick={() => {
+                    if (window.confirm(`Soft-delete "${sc.name}"?`)) remove.mutate(sc.id);
+                  }}
+                  data-testid={`delete-scenario-${sc.id}`}
+                >
+                  Delete
+                </Button>
+              </div>
+            </div>
+          </Card>
+        ))}
+        {scenarios.data && scenarios.data.items.length === 0 && !scenarios.isLoading && (
+          <p className="font-mono text-2xs text-text-dim">No scenarios yet.</p>
+        )}
+      </div>
+
+      <Modal
+        open={isModalOpen}
+        title={editing ? `Scenario · ${editing.name}` : 'New scenario template'}
+        accent="purple"
+        onClose={() => {
+          setCreating(false);
+          setEditing(null);
+        }}
+        testid="scenario-template-modal"
+      >
+        {error && <Alert accent="red" className="mb-3">{error}</Alert>}
+        <div className="grid gap-3">
+          <TextField
+            label="Name"
+            value={form.name}
+            onChange={(e) => setForm((f) => ({ ...f, name: e.target.value }))}
+            data-testid="form-scenario-name"
+          />
+          <TextField
+            label="Description"
+            value={form.description}
+            onChange={(e) => setForm((f) => ({ ...f, description: e.target.value }))}
+            data-testid="form-scenario-description"
+          />
+
+          <div>
+            <p className="font-mono text-3xs font-semibold uppercase tracking-wider2 text-text-dim mb-2">
+              Tests in order ({form.test_ids.length})
+            </p>
+            {form.test_ids.length === 0 ? (
+              <p className="font-mono text-2xs text-text-dim mb-2">No test picked yet.</p>
+            ) : (
+              <DndContext sensors={sensors} collisionDetection={closestCenter} onDragEnd={onDragEnd}>
+                <SortableContext items={form.test_ids} strategy={verticalListSortingStrategy}>
+                  <ol className="grid gap-2 mb-3" data-testid="scenario-tests-ordered">
+                    {form.test_ids.map((id, idx) => (
+                      <SortableTestRow
+                        key={id}
+                        id={id}
+                        index={idx}
+                        name={testNameById.get(id) ?? '<missing>'}
+                        onRemove={() =>
+                          setForm((f) => ({ ...f, test_ids: f.test_ids.filter((t) => t !== id) }))
+                        }
+                      />
+                    ))}
+                  </ol>
+                </SortableContext>
+              </DndContext>
+            )}
+
+            <CataloguePicker
+              tests={availableTests}
+              onAdd={(id) => setForm((f) => ({ ...f, test_ids: [...f.test_ids, id] }))}
+            />
+          </div>
+
+          <div className="flex justify-end gap-2 pt-2">
+            <Button
+              variant="ghost"
+              onClick={() => {
+                setCreating(false);
+                setEditing(null);
+              }}
+            >
+              Cancel
+            </Button>
+            <Button
+              accent="purple"
+              onClick={submit}
+              disabled={create.isPending || updateMeta.isPending || setTests.isPending}
+              data-testid="form-scenario-submit"
+            >
+              {editing ? 'Save' : 'Create'}
+            </Button>
+          </div>
+        </div>
+      </Modal>
+    </>
+  );
+}
+
+interface CataloguePickerProps {
+  tests: TestTemplate[];
+  onAdd: (id: string) => void;
+}
+
+function CataloguePicker({ tests, onAdd }: CataloguePickerProps) {
+  const [q, setQ] = useState('');
+  const filtered = useMemo(() => {
+    const norm = q.trim().toLowerCase();
+    if (!norm) return tests.slice(0, 50);
+    return tests.filter((t) => t.name.toLowerCase().includes(norm)).slice(0, 50);
+  }, [tests, q]);
+
+  return (
+    <div className="rounded-md border border-border bg-bg-card p-3">
+      <p className="font-mono text-3xs font-semibold uppercase tracking-wider2 text-text-dim mb-2">
+        Add a test from the catalogue
+      </p>
+      <input
+        value={q}
+        onChange={(e) => setQ(e.target.value)}
+        placeholder="Search catalogue…"
+        className="mb-2 w-full rounded-md border border-border bg-bg-base px-3 py-2 font-mono text-xs text-text-bright placeholder:text-text-dim focus:border-cyan focus:outline-none"
+        data-testid="scenario-catalogue-search"
+      />
+      <ul className="max-h-48 overflow-auto grid gap-1" data-testid="scenario-catalogue-list">
+        {filtered.map((t) => (
+          <li key={t.id} className="flex items-center gap-2">
+            <button
+              type="button"
+              onClick={() => onAdd(t.id)}
+              className="flex-1 text-left rounded-sm px-2 py-1 font-mono text-xs text-text-bright hover:bg-bg-base"
+              data-testid={`catalogue-add-${t.id}`}
+            >
+              + {t.name}
+            </button>
+          </li>
+        ))}
+        {filtered.length === 0 && (
+          <li className="font-mono text-2xs text-text-dim">No matching test in the catalogue.</li>
+        )}
+      </ul>
+    </div>
+  );
+}
+
+function humanError(e: unknown): string {
+  if (e instanceof ApiError) {
+    const p = e.payload as { error?: string; message?: string } | null;
+    return p?.message ?? p?.error ?? `HTTP ${e.status}`;
+  }
+  return e instanceof Error ? e.message : 'Unexpected error';
+}
diff --git a/frontend/src/pages/AdminTestsPage.tsx b/frontend/src/pages/AdminTestsPage.tsx
new file mode 100644
index 0000000..ceb7b04
--- /dev/null
+++ b/frontend/src/pages/AdminTestsPage.tsx
@@ -0,0 +1,403 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import { useState } from 'react';
+
+import { MarkdownField } from '@/components/MarkdownField';
+import { MitreTagPicker } from '@/components/MitreTagPicker';
+import { Alert } from '@/components/ui/Alert';
+import { Button } from '@/components/ui/Button';
+import { Card } from '@/components/ui/Card';
+import { Modal } from '@/components/ui/Modal';
+import { SectionHeader } from '@/components/ui/SectionHeader';
+import { Tag } from '@/components/ui/Tag';
+import { TextField } from '@/components/ui/TextField';
+import {
+  ApiError,
+  apiDelete,
+  apiGet,
+  apiPost,
+  apiPut,
+} from '@/lib/api';
+import { type MitreTag, type MitreTagKind } from '@/lib/mitre';
+import {
+  buildTestQueryString,
+  templateKeys,
+  type CreateTestTemplatePayload,
+  type OpsecLevel,
+  type TestTemplate,
+  type TestTemplateFilters,
+  type TestTemplateListResponse,
+} from '@/lib/templates';
+
+const OPSEC_LEVELS: OpsecLevel[] = ['low', 'medium', 'high'];
+
+interface FormState {
+  name: string;
+  description: string;
+  objective: string;
+  procedure_md: string;
+  prerequisites_md: string;
+  expected_result_red_md: string;
+  expected_detection_blue_md: string;
+  opsec_level: OpsecLevel;
+  tags: string;
+  expected_iocs: string;
+  mitre_tags: MitreTag[];
+}
+
+function blankForm(): FormState {
+  return {
+    name: '',
+    description: '',
+    objective: '',
+    procedure_md: '',
+    prerequisites_md: '',
+    expected_result_red_md: '',
+    expected_detection_blue_md: '',
+    opsec_level: 'medium',
+    tags: '',
+    expected_iocs: '',
+    mitre_tags: [],
+  };
+}
+
+function toForm(t: TestTemplate): FormState {
+  return {
+    name: t.name,
+    description: t.description ?? '',
+    objective: t.objective ?? '',
+    procedure_md: t.procedure_md ?? '',
+    prerequisites_md: t.prerequisites_md ?? '',
+    expected_result_red_md: t.expected_result_red_md ?? '',
+    expected_detection_blue_md: t.expected_detection_blue_md ?? '',
+    opsec_level: t.opsec_level,
+    tags: t.tags.join(', '),
+    expected_iocs: t.expected_iocs.join(', '),
+    mitre_tags: t.mitre_tags.map((tag) => ({
+      kind: tag.kind as MitreTagKind,
+      id: tag.external_id,
+      external_id: tag.external_id,
+      name: tag.name,
+    })),
+  };
+}
+
+function csvToList(s: string): string[] {
+  return s.split(',').map((x) => x.trim()).filter(Boolean);
+}
+
+function toPayload(form: FormState): CreateTestTemplatePayload {
+  return {
+    name: form.name.trim(),
+    description: form.description || null,
+    objective: form.objective || null,
+    procedure_md: form.procedure_md || null,
+    prerequisites_md: form.prerequisites_md || null,
+    expected_result_red_md: form.expected_result_red_md || null,
+    expected_detection_blue_md: form.expected_detection_blue_md || null,
+    opsec_level: form.opsec_level,
+    tags: csvToList(form.tags),
+    expected_iocs: csvToList(form.expected_iocs),
+    mitre_tags: form.mitre_tags.map((t) => ({ kind: t.kind, external_id: t.external_id })),
+  };
+}
+
+function useTestTemplates(filters: TestTemplateFilters) {
+  return useQuery({
+    queryKey: templateKeys.tests(filters),
+    queryFn: () =>
+      apiGet<TestTemplateListResponse>(`/test-templates${buildTestQueryString(filters)}`),
+  });
+}
+
+export function AdminTestsPage() {
+  const qc = useQueryClient();
+  const [filters, setFilters] = useState<TestTemplateFilters>({});
+  const [editing, setEditing] = useState<TestTemplate | null>(null);
+  const [creating, setCreating] = useState(false);
+  const [form, setForm] = useState<FormState>(blankForm());
+  const [error, setError] = useState<string | null>(null);
+
+  const tests = useTestTemplates(filters);
+
+  const create = useMutation({
+    mutationFn: (payload: CreateTestTemplatePayload) =>
+      apiPost<TestTemplate>('/test-templates', payload),
+    onSuccess: async () => {
+      setCreating(false);
+      setForm(blankForm());
+      setError(null);
+      await qc.invalidateQueries({ queryKey: ['templates', 'tests'] });
+    },
+    onError: (e) => setError(humanError(e)),
+  });
+
+  const update = useMutation({
+    mutationFn: ({ id, payload }: { id: string; payload: CreateTestTemplatePayload }) =>
+      apiPut<TestTemplate>(`/test-templates/${id}`, payload),
+    onSuccess: async () => {
+      setEditing(null);
+      setError(null);
+      await qc.invalidateQueries({ queryKey: ['templates', 'tests'] });
+    },
+    onError: (e) => setError(humanError(e)),
+  });
+
+  const remove = useMutation({
+    mutationFn: (id: string) => apiDelete<{ ok: boolean }>(`/test-templates/${id}`),
+    onSuccess: async () => {
+      await qc.invalidateQueries({ queryKey: ['templates', 'tests'] });
+    },
+  });
+
+  function openCreate() {
+    setForm(blankForm());
+    setError(null);
+    setCreating(true);
+  }
+
+  function openEdit(t: TestTemplate) {
+    setForm(toForm(t));
+    setError(null);
+    setEditing(t);
+  }
+
+  function submit() {
+    const payload = toPayload(form);
+    if (!payload.name) {
+      setError('Name is required.');
+      return;
+    }
+    if (editing) update.mutate({ id: editing.id, payload });
+    else create.mutate(payload);
+  }
+
+  const isModalOpen = creating || editing !== null;
+
+  return (
+    <>
+      <SectionHeader
+        prefix="Admin"
+        highlight="Tests"
+        accent="orange"
+        description="Reusable test units. Each test belongs to a scenario at instantiation time, but the catalogue lives independently."
+      />
+
+      <div className="mb-6 flex flex-wrap items-end gap-3" data-testid="tests-filters">
+        <TextField
+          label="Search"
+          placeholder="name or description"
+          value={filters.q ?? ''}
+          onChange={(e) => setFilters((f) => ({ ...f, q: e.target.value || undefined }))}
+          data-testid="filter-q"
+        />
+        <TextField
+          label="Tactic external_id"
+          placeholder="TA0006"
+          value={filters.tactic ?? ''}
+          onChange={(e) => setFilters((f) => ({ ...f, tactic: e.target.value || undefined }))}
+          data-testid="filter-tactic"
+        />
+        <label className="block">
+          <span className="block font-mono text-3xs font-semibold uppercase tracking-wider2 text-text-dim">
+            OPSEC
+          </span>
+          <select
+            value={filters.opsec ?? ''}
+            onChange={(e) =>
+              setFilters((f) => ({ ...f, opsec: (e.target.value as OpsecLevel | '') || undefined }))
+            }
+            className="mt-1 rounded-md border border-border bg-bg-card px-3 py-2 font-mono text-xs text-text-bright"
+            data-testid="filter-opsec"
+          >
+            <option value="">— all —</option>
+            {OPSEC_LEVELS.map((lv) => (
+              <option key={lv} value={lv}>{lv}</option>
+            ))}
+          </select>
+        </label>
+        <TextField
+          label="Free tag"
+          placeholder="phish"
+          value={filters.tag ?? ''}
+          onChange={(e) => setFilters((f) => ({ ...f, tag: e.target.value || undefined }))}
+          data-testid="filter-tag"
+        />
+        <Button accent="orange" onClick={openCreate} data-testid="create-test" className="ml-auto">
+          + New test
+        </Button>
+      </div>
+
+      {tests.isError && <Alert accent="red">Failed to load tests.</Alert>}
+
+      <div className="grid gap-3" data-testid="tests-list">
+        {tests.isLoading && <p className="font-mono text-xs text-text-dim">Loading…</p>}
+        {tests.data?.items.map((t) => (
+          <Card
+            key={t.id}
+            accent="orange"
+            title={t.name}
+            sub={t.description ?? '—'}
+            data-testid={`test-row-${t.id}`}
+          >
+            <div className="flex flex-wrap items-center gap-2">
+              <Tag accent={t.opsec_level === 'high' ? 'red' : t.opsec_level === 'low' ? 'green' : 'yellow'}>
+                opsec: {t.opsec_level}
+              </Tag>
+              {t.mitre_tags.map((tag) => (
+                <Tag
+                  key={`${tag.kind}:${tag.external_id}`}
+                  accent={tag.kind === 'tactic' ? 'cyan' : tag.kind === 'technique' ? 'orange' : 'purple'}
+                >
+                  {tag.external_id}
+                </Tag>
+              ))}
+              {t.tags.map((tg) => (
+                <Tag key={tg} accent="cyan">#{tg}</Tag>
+              ))}
+              <div className="ml-auto flex gap-2">
+                <Button accent="orange" onClick={() => openEdit(t)} data-testid={`edit-test-${t.id}`}>
+                  Edit
+                </Button>
+                <Button
+                  accent="rose"
+                  variant="ghost"
+                  onClick={() => {
+                    if (window.confirm(`Soft-delete "${t.name}"?`)) remove.mutate(t.id);
+                  }}
+                  data-testid={`delete-test-${t.id}`}
+                >
+                  Delete
+                </Button>
+              </div>
+            </div>
+          </Card>
+        ))}
+        {tests.data && tests.data.items.length === 0 && !tests.isLoading && (
+          <p className="font-mono text-2xs text-text-dim">No tests match the current filters.</p>
+        )}
+      </div>
+
+      <Modal
+        open={isModalOpen}
+        title={editing ? `Test · ${editing.name}` : 'New test template'}
+        accent="orange"
+        onClose={() => {
+          setCreating(false);
+          setEditing(null);
+        }}
+        testid="test-template-modal"
+      >
+        {error && <Alert accent="red" className="mb-3">{error}</Alert>}
+        <div className="grid gap-3">
+          <TextField
+            label="Name"
+            value={form.name}
+            onChange={(e) => setForm((f) => ({ ...f, name: e.target.value }))}
+            data-testid="form-name"
+          />
+          <TextField
+            label="Description"
+            value={form.description}
+            onChange={(e) => setForm((f) => ({ ...f, description: e.target.value }))}
+            data-testid="form-description"
+          />
+          <TextField
+            label="Objective (1-liner)"
+            value={form.objective}
+            onChange={(e) => setForm((f) => ({ ...f, objective: e.target.value }))}
+          />
+          <MarkdownField
+            label="Procedure"
+            value={form.procedure_md}
+            onChange={(v) => setForm((f) => ({ ...f, procedure_md: v }))}
+            data-testid="form-procedure"
+            hint="Step-by-step playbook. Markdown supported."
+          />
+          <MarkdownField
+            label="Prerequisites"
+            value={form.prerequisites_md}
+            onChange={(v) => setForm((f) => ({ ...f, prerequisites_md: v }))}
+          />
+          <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
+            <MarkdownField
+              label="Red — expected result"
+              value={form.expected_result_red_md}
+              onChange={(v) => setForm((f) => ({ ...f, expected_result_red_md: v }))}
+              rows={4}
+            />
+            <MarkdownField
+              label="Blue — expected detection"
+              value={form.expected_detection_blue_md}
+              onChange={(v) => setForm((f) => ({ ...f, expected_detection_blue_md: v }))}
+              rows={4}
+            />
+          </div>
+          <label className="block">
+            <span className="block font-mono text-3xs font-semibold uppercase tracking-wider2 text-text-dim">
+              OPSEC level
+            </span>
+            <select
+              value={form.opsec_level}
+              onChange={(e) => setForm((f) => ({ ...f, opsec_level: e.target.value as OpsecLevel }))}
+              className="mt-1 rounded-md border border-border bg-bg-card px-3 py-2 font-mono text-xs text-text-bright"
+              data-testid="form-opsec"
+            >
+              {OPSEC_LEVELS.map((lv) => (
+                <option key={lv} value={lv}>{lv}</option>
+              ))}
+            </select>
+          </label>
+          <TextField
+            label="Free tags (comma-separated)"
+            value={form.tags}
+            onChange={(e) => setForm((f) => ({ ...f, tags: e.target.value }))}
+            data-testid="form-tags"
+            hint="e.g. phish, persistence, quick-win"
+          />
+          <TextField
+            label="Expected IOCs (comma-separated)"
+            value={form.expected_iocs}
+            onChange={(e) => setForm((f) => ({ ...f, expected_iocs: e.target.value }))}
+            hint="Indicators the blue team should look for"
+          />
+          <div>
+            <p className="font-mono text-3xs font-semibold uppercase tracking-wider2 text-text-dim mb-1">
+              MITRE ATT&amp;CK tags
+            </p>
+            <MitreTagPicker
+              value={form.mitre_tags}
+              onChange={(next) => setForm((f) => ({ ...f, mitre_tags: next }))}
+            />
+          </div>
+          <div className="flex justify-end gap-2 pt-2">
+            <Button
+              variant="ghost"
+              onClick={() => {
+                setCreating(false);
+                setEditing(null);
+              }}
+            >
+              Cancel
+            </Button>
+            <Button
+              accent="orange"
+              onClick={submit}
+              disabled={create.isPending || update.isPending}
+              data-testid="form-submit"
+            >
+              {editing ? 'Save' : 'Create'}
+            </Button>
+          </div>
+        </div>
+      </Modal>
+    </>
+  );
+}
+
+function humanError(e: unknown): string {
+  if (e instanceof ApiError) {
+    const p = e.payload as { error?: string; message?: string } | null;
+    return p?.message ?? p?.error ?? `HTTP ${e.status}`;
+  }
+  return e instanceof Error ? e.message : 'Unexpected error';
+}