@@ -21,7 +21,7 @@ The iOS app (`@debatelab/mobile`): Expo SDK 57, React Native 0.86, React 19, Exp
 - `src/lib/`: auth (`auth.tsx`), the Supabase client, session storage (AES key in SecureStore, ciphertext in AsyncStorage) and i18n. `debates.ts`, `settings.tsx`, `subscription.ts` and `account.ts` read and write the website's tables the way its stores do (`src/lib/stores/debate-store.ts`, `settings-store.ts`, `src/hooks/use-subscription.ts`, `src/lib/account.ts`), so the app and the website share one Current Debate and one set of settings. Change them together with the website code they mirror.
 - `sources.ts` mirrors the session store's `addSource` and `removeSource` and `src/lib/source-import.ts`. The Library always shows the Current Debate, also in one-off mode, as on the website. Adding a file (the website parses files in the browser) and Scan pages are not in the app yet.
 - Ask mirrors `src/lib/ai/streaming.ts` and `askChat` in `src/lib/ai/client.ts`: `ask.ts` sends the requests (plain questions stream from `ai-stream` through `expo/fetch`; with Citations, Web search, Pros/Cons or Argument map on, the whole answer comes from `ai`, because `ai-stream` refuses those options), `ai-request.ts` holds the shared POST with the website's headers, timeout and error kinds, `feature-config.ts` reads each tool's model from `user_settings.feature_configs`, `context-request.ts` builds the Current Debate context with the website's default selection and pins, and `chats.ts` saves finished exchanges to `chats` and `messages`. The SSE parser is shared in `packages/core/src/ai/sse.ts`. `markdown.ts` reads answers, because react-markdown needs the DOM.
-- Generate and Attack mirror `generateCase` and `attackCase` in `src/lib/ai/client.ts` and the session store's `recordResult`: `results.ts` sends the requests through `ai-request.ts`, checks the output with the website's transform (moved to `packages/core/src/ai/generate-output.ts`), keeps researched sources in the debate's Auto-saved folder (`packages/core/src/ai/discovered-sources.ts`) and saves rows to `cases` and `attacks`. `motion.ts` and `motion-gate.ts` are the website's motion gate. `open-results.ts` holds results made in this session, so one-off work and failed saves still open as documents. `components/document.tsx` draws results as documents (mock 03); Brainstorm and Factoids reuse it. Export renders `export-html.ts` to a PDF with expo-print and shares it (`export.ts`); the web preview cannot print, so `export.web.ts` keeps the HTML and copied text on `window` for the screenshot script. Word export and Google Docs are not in the app.
+- Generate and Attack mirror `generateCase` and `attackCase` in `src/lib/ai/client.ts` and the session store's `recordResult`: `results.ts` sends the requests through `ai-request.ts`, checks the output with the website's transform (moved to `packages/core/src/ai/generate-output.ts`), keeps researched sources in the debate's Auto-saved folder (`packages/core/src/ai/discovered-sources.ts`), saves the server's source rankings onto the Library sources a result used (`packages/core/src/ai/source-assessments.ts`, also for Ask's whole answers), says when the server shortened the input, and saves rows to `cases` and `attacks`. `motion.ts` and `motion-gate.ts` are the website's motion gate. `open-results.ts` holds results made in this session, so one-off work and failed saves still open as documents. It and the last Generate and Attack forms live in `session-memory.ts`, which the auth provider clears on every account change, including sign-out. `components/document.tsx` draws results as documents (mock 03); Brainstorm and Factoids reuse it. Export renders `export-html.ts` to a PDF with expo-print and shares it (`export.ts`); the web preview cannot print, so `export.web.ts` keeps the HTML and copied text on `window` for the screenshot script. Word export and Google Docs are not in the app.
 - One-off mode is session-only and never written, as on the website. Students prepare both sides of a motion, so a debate has no side: the Debate tab's In favor / Against toggle only chooses which side's work it shows, using the website's rule (`'both'` counts for either side, neutral and side-less work for neither). It starts on In favor and is never stored.
 - `src/theme/`: colours from the mocks and the website's dark palette, Inter fonts.
 - `scripts/screenshots.ts`: web-export screenshots. `scripts/render-tab-icons.ts` redraws the tab bar PNGs.
 
@@ -27,23 +27,25 @@ export default function PrepareScreen() {
   const userId = session?.user.id ?? null;
   const { current, oneOff } = useDebates();
   const debateId = current?.id ?? null;
-  const [items, setItems] = useState<DebateItem[] | null>(null);
-  const [failed, setFailed] = useState(false);
+  // Each load belongs to the debate it was read for, so another debate's results never show, or open, under this one.
+  const [loaded, setLoaded] = useState<{ debateId: string; items: DebateItem[] | null; failed: boolean } | null>(null);
+  const items = loaded?.debateId === debateId ? loaded.items : null;
+  const failed = loaded?.debateId === debateId && loaded.failed;
 
   const openTool = (tool: PrepareTool) =>
     tool === 'generate' ? router.push({ pathname: '/generate', params: { from: 'prepare' } }) : router.push({ pathname: '/coming/[tool]', params: { tool } });
 
   const load = useCallback(async (isCurrent: () => boolean) => {
     if (!userId || !debateId) return;
+    const forDebate = debateId;
     try {
-      const next = await fetchPrepareWork(userId, debateId, SAVED_LIMIT);
+      const next = await fetchPrepareWork(userId, forDebate, SAVED_LIMIT);
       if (!isCurrent()) return;
-      setItems(next);
-      setFailed(false);
+      setLoaded({ debateId: forDebate, items: next, failed: false });
     } catch (cause) {
       if (!isCurrent()) return;
       console.warn('Could not load saved results:', cause instanceof Error ? cause.message : cause);
-      setFailed(true);
+      setLoaded({ debateId: forDebate, items: null, failed: true });
     }
   }, [userId, debateId]);
 
 
@@ -12,13 +12,14 @@ import { Chip } from '@/components/chip';
 import { Icon } from '@/components/icon';
 import type { IconName } from '@/components/icon-paths';
 import { Text } from '@/components/text';
-import { AIError, isAbortError, type AIErrorKind } from '@/lib/ai-request';
+import { AIError, isAbortError, type AIErrorKind, type ResponseExtras } from '@/lib/ai-request';
 import { askOnce, canStream, isFinalAskError, isMessageWithinBudget, streamAsk, type AskOptions } from '@/lib/ask';
 import { buildDebateContext } from '@/lib/context-request';
 import { fetchFeatureConfig, type FeatureConfig } from '@/lib/feature-config';
 import { useAuth } from '@/lib/auth';
 import { ChatSaveError, fetchChat, saveChat, type ChatMessage, type ChatRecord } from '@/lib/chats';
 import { useDebates } from '@/lib/debate-context';
+import { keepSourceAssessments } from '@/lib/results';
 import { useSettings } from '@/lib/settings';
 import { fetchSources, type Source } from '@/lib/sources';
 import { radius } from '@/theme/colors';
@@ -125,10 +126,9 @@ export default function AskScreen() {
   // The debate this conversation reads from: a loaded chat keeps its own.
   const chatDebateId = record.chatId ? record.debateId : activeDebateId;
   useEffect(() => {
-    if (!chatDebateId || !userId) {
-      setLibrary([]);
-      return;
-    }
+    // The previous debate's sources never stand in for this one's while they load.
+    setLibrary([]);
+    if (!chatDebateId || !userId) return;
     let active = true;
     fetchSources(userId, chatDebateId)
       .then((next) => {
@@ -200,6 +200,10 @@ export default function AskScreen() {
       };
 
       let result: AskOutput;
+      const whole: { extras?: ResponseExtras } = {};
+      const keepExtras = (extras: ResponseExtras) => {
+        whole.extras = extras;
+      };
       if (canStream(requestOptions)) {
         let received = '';
         let pending = '';
@@ -231,16 +235,27 @@ export default function AskScreen() {
           } else {
             // Nothing arrived: ask once more without streaming, as the website does.
             setStreaming(null);
-            result = await askOnce(askRequest, controller.signal);
+            result = await askOnce(askRequest, controller.signal, keepExtras);
           }
         } finally {
           if (flush) clearTimeout(flush);
         }
       } else {
-        result = await askOnce(askRequest, controller.signal);
+        result = await askOnce(askRequest, controller.signal, keepExtras);
       }
 
       if (!isCurrent()) return;
+      // A whole answer ranks the Library sources it used and says when the question was shortened, as on the website.
+      if (whole.extras) {
+        const { truncated, assessments } = whole.extras;
+        const assessed = await keepSourceAssessments(userId, debateId, assessments);
+        if (!isCurrent()) return;
+        const notices = [
+          ...(assessed ? [] : [`${t('aiClient.sourceSaveFailed')}. ${t('aiClient.sourceAssessmentSaveFailed')}`]),
+          ...(truncated ? [`${t('aiClient.inputShortened')}. ${t('aiClient.inputShortenedDesc')}`] : []),
+        ];
+        if (notices.length > 0) setNotice(notices.join(' '));
+      }
       const output = {
         ...result,
         model: result.model || askSettings.model,
 
@@ -14,7 +14,7 @@ import { copyText, sharePdf, shareText } from '@/lib/export';
 import { attackExportFileName, attackExportHtml } from '@/lib/export-html';
 import { attackToText, discussAttackMessage } from '@/lib/result-text';
 import { isCompleteAttack } from '@/lib/results';
-import { useResultDocument } from '@/lib/use-result-document';
+import { arrivalNoticeText, useResultDocument } from '@/lib/use-result-document';
 
 /**
  * An attack analysis in the same document style as a case. Its pinned next
@@ -29,8 +29,8 @@ export default function AttackResultScreen() {
   const { setNotice } = doc;
 
   useEffect(() => {
-    if (arrival === 'recordFailed') setNotice(t('debate.recordFailed'));
-    if (arrival === 'sourcesFailed') setNotice(t('mobile.results.sourcesFailed', { count: Number(failed) || 1 }));
+    const text = arrivalNoticeText(t, arrival, failed);
+    if (text) setNotice(text);
   }, [arrival, failed, setNotice, t]);
 
   const result = doc.state.status === 'ready' ? doc.state.result : null;
 
@@ -19,7 +19,8 @@ import { useDebates } from '@/lib/debate-context';
 import { fetchFeatureConfig } from '@/lib/feature-config';
 import { keepOpenResult, openResult } from '@/lib/open-results';
 import { caseToText } from '@/lib/result-text';
-import { attackCase, autosaveSources, fetchResult, isCompleteCase, recordResult } from '@/lib/results';
+import { arrivalNotices, attackCase, autosaveSources, fetchResult, isCompleteCase, keepSourceAssessments, recordResult } from '@/lib/results';
+import { sessionSlot } from '@/lib/session-memory';
 import { useSettings } from '@/lib/settings';
 import { useTheme } from '@/theme/use-theme';
 
@@ -31,7 +32,7 @@ const DEFAULT_FORM: AttackInput = {
   detectFallacies: true,
   analyzeWeighing: true,
 };
-let lastForm: AttackInput = DEFAULT_FORM;
+const lastForm = sessionSlot<AttackInput>(() => DEFAULT_FORM);
 
 const PROGRESS = ['attackForm.loadingMsg1', 'attackForm.loadingMsg2', 'attackForm.loadingMsg3', 'attackForm.loadingMsg4', 'attackForm.loadingMsg5'];
 
@@ -48,7 +49,7 @@ export default function AttackScreen() {
   const { activeDebateId, refresh } = useDebates();
   const { outputLanguage } = useSettings();
   const { colors } = useTheme();
-  const [form, setFormState] = useState<AttackInput>(lastForm);
+  const [form, setFormState] = useState<AttackInput>(lastForm.get);
   const [textError, setTextError] = useState(false);
   const [phase, setPhase] = useState<'form' | 'attacking'>('form');
   const [error, setError] = useState<AIErrorKind | null>(null);
@@ -59,7 +60,7 @@ export default function AttackScreen() {
   const setForm = useCallback((patch: Partial<AttackInput>) =>
     setFormState((previous) => {
       const next = { ...previous, ...patch };
-      lastForm = next;
+      lastForm.set(next);
       return next;
     }), []);
 
@@ -117,9 +118,11 @@ export default function AttackScreen() {
         debateId ? buildDebateContext(forUser, debateId, 'attack', 'both') : Promise.resolve(undefined),
       ]);
       if (!isCurrent()) return;
-      const { result, discoveredSources } = await attackCase(input, { config, language: outputLanguage, debateContext, signal: controller.signal });
+      const { result, discoveredSources, truncated, assessments } = await attackCase(input, { config, language: outputLanguage, debateContext, signal: controller.signal });
       if (!isCurrent()) return;
-      const sources = await autosaveSources(forUser, discoveredSources, 'attack', debateId);
+      const assessed = await keepSourceAssessments(forUser, debateId, assessments);
+      if (!isCurrent()) return;
+      const sources = await autosaveSources(forUser, discoveredSources, 'attack', debateId, controller.signal);
       if (!isCurrent()) return;
       const title = result.overallAssessment?.summary?.slice(0, 80) || input.caseText.slice(0, 80);
       let savedId: string | null = null;
@@ -134,7 +137,7 @@ export default function AttackScreen() {
       }
       if (!isCurrent()) return;
       const key = keepOpenResult({ kind: 'attack', savedId, title, side: 'neutral', debateId, createdAt: Date.now(), input, output: result, sources: discoveredSources });
-      const notice = recordFailed ? 'recordFailed' : sources.failed > 0 ? 'sourcesFailed' : undefined;
+      const notice = arrivalNotices({ recordFailed, sourcesFailed: sources.failed, assessed, truncated });
       router.replace({
         pathname: '/attack/[id]',
         params: {
 
@@ -15,7 +15,7 @@ import { copyText, sharePdf, shareText } from '@/lib/export';
 import { caseExportFileName, caseExportHtml } from '@/lib/export-html';
 import { caseToText, discussCaseMessage } from '@/lib/result-text';
 import { isCompleteCase } from '@/lib/results';
-import { useResultDocument } from '@/lib/use-result-document';
+import { arrivalNoticeText, useResultDocument } from '@/lib/use-result-document';
 
 /** A generated case read as a document, as in mock 03. */
 export default function CaseScreen() {
@@ -28,8 +28,8 @@ export default function CaseScreen() {
 
   // Problems from saving a fresh result are told once, on arrival.
   useEffect(() => {
-    if (arrival === 'recordFailed') setNotice(t('debate.recordFailed'));
-    if (arrival === 'sourcesFailed') setNotice(t('mobile.results.sourcesFailed', { count: Number(failed) || 1 }));
+    const text = arrivalNoticeText(t, arrival, failed);
+    if (text) setNotice(text);
   }, [arrival, failed, setNotice, t]);
 
   const result = doc.state.status === 'ready' ? doc.state.result : null;
 
@@ -21,7 +21,8 @@ import { fetchFeatureConfig } from '@/lib/feature-config';
 import { decideMotionTarget, shouldPrefillMotion } from '@/lib/motion';
 import { chooseMotionTarget } from '@/lib/motion-gate';
 import { keepOpenResult } from '@/lib/open-results';
-import { autosaveSources, generateCase, recordResult } from '@/lib/results';
+import { arrivalNotices, autosaveSources, generateCase, keepSourceAssessments, recordResult } from '@/lib/results';
+import { sessionSlot } from '@/lib/session-memory';
 import { useSettings } from '@/lib/settings';
 import { useTheme } from '@/theme/use-theme';
 
@@ -35,7 +36,7 @@ const DEFAULT_FORM: GenerateInput = {
   audience: 'intermediate',
   tone: 'formal',
 };
-let lastForm: GenerateInput = DEFAULT_FORM;
+const lastForm = sessionSlot<GenerateInput>(() => DEFAULT_FORM);
 
 const PROGRESS = ['generateForm.loadingMsg1', 'generateForm.loadingMsg2', 'generateForm.loadingMsg3', 'generateForm.loadingMsg4', 'generateForm.loadingMsg5'];
 
@@ -49,7 +50,7 @@ export default function GenerateScreen() {
   const { debates, current, oneOff, create, switchTo, refresh } = useDebates();
   const { outputLanguage } = useSettings();
   const { colors } = useTheme();
-  const [form, setFormState] = useState<GenerateInput>(lastForm);
+  const [form, setFormState] = useState<GenerateInput>(lastForm.get);
   const [motionError, setMotionError] = useState(false);
   const [phase, setPhase] = useState<'form' | 'generating'>('form');
   const [error, setError] = useState<AIErrorKind | 'debate' | null>(null);
@@ -60,7 +61,7 @@ export default function GenerateScreen() {
   const setForm = useCallback((patch: Partial<GenerateInput>) =>
     setFormState((previous) => {
       const next = { ...previous, ...patch };
-      lastForm = next;
+      lastForm.set(next);
       return next;
     }), []);
 
@@ -79,7 +80,7 @@ export default function GenerateScreen() {
   // The motion follows the Current Debate unless the student typed their own.
   useEffect(() => {
     if (oneOff || !current) return;
-    if (shouldPrefillMotion(lastForm.motion, current.motion, debates.map((debate) => debate.motion))) setForm({ motion: current.motion });
+    if (shouldPrefillMotion(lastForm.get().motion, current.motion, debates.map((debate) => debate.motion))) setForm({ motion: current.motion });
   }, [current, debates, oneOff, setForm]);
 
   const start = async (input: GenerateInput, debateId: string | null, forUser: string) => {
@@ -96,9 +97,11 @@ export default function GenerateScreen() {
         debateId ? buildDebateContext(forUser, debateId, 'generate', input.side) : Promise.resolve(undefined),
       ]);
       if (!isCurrent()) return;
-      const { result, discoveredSources } = await generateCase(input, { config, language: outputLanguage, debateContext, signal: controller.signal });
+      const { result, discoveredSources, truncated, assessments } = await generateCase(input, { config, language: outputLanguage, debateContext, signal: controller.signal });
       if (!isCurrent()) return;
-      const sources = await autosaveSources(forUser, discoveredSources, 'generate', debateId);
+      const assessed = await keepSourceAssessments(forUser, debateId, assessments);
+      if (!isCurrent()) return;
+      const sources = await autosaveSources(forUser, discoveredSources, 'generate', debateId, controller.signal);
       if (!isCurrent()) return;
       let savedId: string | null = null;
       let recordFailed = false;
@@ -122,7 +125,7 @@ export default function GenerateScreen() {
         output: result,
         sources: discoveredSources,
       });
-      const notice = recordFailed ? 'recordFailed' : sources.failed > 0 ? 'sourcesFailed' : undefined;
+      const notice = arrivalNotices({ recordFailed, sourcesFailed: sources.failed, assessed, truncated });
       router.replace({
         pathname: '/case/[id]',
         params: { id: key, from: from ?? 'prepare', ...(notice ? { notice } : {}), ...(sources.failed > 0 ? { failed: String(sources.failed) } : {}) },
 
@@ -30,7 +30,8 @@ export function AttackDocument({ output, sources }: { output: AttackOutput; sour
     const severityLabel = t(`attackResults.${severity}`);
     const typeLabel = t(`attackResults.types.${weakness.type}`, { defaultValue: weakness.type });
     return {
-      key: weakness.id || `${index}`,
+      // Model ids can repeat, so the expansion state is keyed by position.
+      key: `${index}`,
       title: weakness.description,
       summary: `${severityLabel} · ${typeLabel}`,
       body: (