feat(learn): choosing how much an assistant thinks, and the assistants by provider in the field

Halkyon Learn's ADR 0021, D60 and D63:

- A chip after the scope's offers the efforts the operator allows for the
  assistant asked, its own marked; the one picked is kept per assistant on
  the device (DeviceSettings.askEfforts) and asked at, also by a
  conversation continued from the history. One the operator no longer
  allows counts as none.
- Every question asks for its effort's ceiling on output, as the thinking
  counts towards it (8,192 to 65,536 tokens; 16,384 at the model's own),
  where it asked for 4,096; the flashcards proposed, Explain and Why? ask
  at the assistant's own effort, a person's own key at none and 4,096.
- The field's picker lists the assistants under their providers' names,
  each in its colour.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/learn/halkyon_learn_flutter/lib/l10n/app_de.arb

@@ -1829,6 +1829,8 @@
   "assistantHintAsk": "{name} fragen…",
   "assistantSendAsk": "Fragen",
   "assistantScope": "Was er nachschlagen darf",
+  "assistantEffortTooltip": "Denkaufwand: wie viel er nachdenkt, bevor er antwortet",
+  "assistantEffortDefault": "{effort} (Standard)",
   "assistantScopeTicked": "Nur was ich auswähle",
   "assistantScopeStudyset": "Dieses Lernset",
   "assistantScopeTree": "Ganzer Baum",

apps/learn/halkyon_learn_flutter/lib/l10n/app_en.arb

@@ -2149,6 +2149,10 @@
   "assistantSendAsk": "Ask",
   "assistantScope": "What it may look up",
   "@assistantScope": {"description": "Tooltip of the scope chip: how far an assistant may look beyond the parts chosen."},
+  "assistantEffortTooltip": "Effort: how much it thinks before it answers",
+  "@assistantEffortTooltip": {"description": "Tooltip of the effort chip in the field (ADR 0021, D63): more effort thinks longer and uses more of the budget."},
+  "assistantEffortDefault": "{effort} (default)",
+  "@assistantEffortDefault": {"description": "The effort the operator set up for an assistant, among those to choose, by its name.", "placeholders": {"effort": {"type": "String"}}},
   "assistantScopeTicked": "Only what I choose",
   "assistantScopeStudyset": "This studyset",
   "assistantScopeTree": "Its tree",

apps/learn/halkyon_learn_flutter/lib/l10n/app_localizations.dart

@@ -10791,6 +10791,18 @@ abstract class AppLocalizations {
   /// **'What it may look up'**
   String get assistantScope;
 
+  /// Tooltip of the effort chip in the field (ADR 0021, D63): more effort thinks longer and uses more of the budget.
+  ///
+  /// In en, this message translates to:
+  /// **'Effort: how much it thinks before it answers'**
+  String get assistantEffortTooltip;
+
+  /// The effort the operator set up for an assistant, among those to choose, by its name.
+  ///
+  /// In en, this message translates to:
+  /// **'{effort} (default)'**
+  String assistantEffortDefault(String effort);
+
   /// No description provided for @assistantScopeTicked.
   ///
   /// In en, this message translates to:

apps/learn/halkyon_learn_flutter/lib/l10n/app_localizations_de.dart

@@ -6758,6 +6758,15 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get assistantScope => 'Was er nachschlagen darf';
 
+  @override
+  String get assistantEffortTooltip =>
+      'Denkaufwand: wie viel er nachdenkt, bevor er antwortet';
+
+  @override
+  String assistantEffortDefault(String effort) {
+    return '$effort (Standard)';
+  }
+
   @override
   String get assistantScopeTicked => 'Nur was ich auswähle';
 

apps/learn/halkyon_learn_flutter/lib/l10n/app_localizations_en.dart

@@ -6694,6 +6694,15 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get assistantScope => 'What it may look up';
 
+  @override
+  String get assistantEffortTooltip =>
+      'Effort: how much it thinks before it answers';
+
+  @override
+  String assistantEffortDefault(String effort) {
+    return '$effort (default)';
+  }
+
   @override
   String get assistantScopeTicked => 'Only what I choose';
 

apps/learn/halkyon_learn_flutter/lib/src/core/device_settings/bloc/device_settings_bloc.dart

@@ -6,6 +6,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:halkyon_learn_flutter/src/core/citation/model/citation.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/data/device_settings_store.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/model/device_settings.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 
 /// The device's own settings, starting at what it kept: a choice applies at
 /// once and is kept for the next start.
@@ -39,6 +40,10 @@ class DeviceSettingsBloc(
     on<DeviceSettingsEventAskedWith>(
       (event, emit) => _apply(emit, state.withAskWith(event.key)),
     );
+    on<DeviceSettingsEventEffortChosen>(
+      (event, emit) =>
+          _apply(emit, state.withAskEffort(event.key, event.effort)),
+    );
     on<DeviceSettingsEventCheckGrammarChosen>(
       (event, emit) => _apply(emit, state.withCheckGrammar(event.on)),
     );
@@ -126,6 +131,16 @@ final class const DeviceSettingsEventAskedWith(final String key)
   List<Object?> get props => [key];
 }
 
+/// The person chose to ask the assistant [key] (`DeviceSettings.askWith`)
+/// at [effort].
+final class const DeviceSettingsEventEffortChosen(
+  final String key,
+  final LlmEffort effort,
+) extends DeviceSettingsEvent {
+  @override
+  List<Object?> get props => [key, effort];
+}
+
 /// The person turned checking writing as it is written [on] or off.
 final class const DeviceSettingsEventCheckGrammarChosen(final bool on)
     extends DeviceSettingsEvent {

apps/learn/halkyon_learn_flutter/lib/src/core/device_settings/data/device_settings_store.dart

@@ -4,6 +4,7 @@ import 'dart:io';
 
 import 'package:halkyon_learn_flutter/src/core/citation/model/citation.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/model/device_settings.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 
 /// Where a device keeps its own settings.
 abstract interface class DeviceSettingsStore() {
@@ -70,6 +71,11 @@ class FileDeviceSettingsStore(final File _file) implements DeviceSettingsStore {
           final String key => key,
           _ => null,
         },
+        askEfforts: {
+          if (json['askEfforts'] case final Map<String, Object?> efforts)
+            for (final MapEntry(:key, :value) in efforts.entries)
+              if (value case final String name) key: ?LlmEffort.named(name),
+        },
         checkGrammar: json['checkGrammar'] != false,
       );
     } on FormatException catch (error) {
@@ -94,6 +100,10 @@ class FileDeviceSettingsStore(final File _file) implements DeviceSettingsStore {
         'customSearchUrl': ?settings.customSearchUrl,
         'pdfSidebarShare': ?settings.pdfSidebarShare,
         'askWith': ?settings.askWith,
+        'askEfforts': {
+          for (final MapEntry(:key, :value) in settings.askEfforts.entries)
+            key: value.key,
+        },
         'checkGrammar': settings.checkGrammar,
       }),
       flush: true,

apps/learn/halkyon_learn_flutter/lib/src/core/device_settings/model/device_settings.dart

@@ -1,5 +1,6 @@
 import 'package:equatable/equatable.dart';
 import 'package:halkyon_learn_flutter/src/core/citation/model/citation.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 
 /// How the app looks: as the device does, or always light or dark.
 enum Appearance() {
@@ -12,8 +13,8 @@ enum Appearance() {
 /// app looks, the language it speaks, the style it cites sources in,
 /// whether studying shows the Pomodoro timer, which studysets' card
 /// browsers show one card at a time, whether and how the person searches
-/// the web from the app, who answered the field last, and whether writing
-/// is checked as it is written.
+/// the web from the app, who answered the field last and at which effort,
+/// and whether writing is checked as it is written.
 /// Unlike the person's settings, they don't follow anyone to other devices,
 /// and they apply before anyone is signed in.
 final class const DeviceSettings({
@@ -58,6 +59,11 @@ final class const DeviceSettings({
   /// null before the first.
   final String? askWith,
 
+  /// The effort each assistant was last asked at from the field, by its
+  /// key as [askWith] names it (ADR 0021, D63); one the operator no longer
+  /// allows counts as none chosen.
+  final Map<String, LlmEffort> askEfforts = const {},
+
   /// Whether the editors underline what the instance's LanguageTool finds
   /// as the person writes (ADR 0024, Settings › Writing): on unless turned
   /// off; nothing is checked where the instance checks nothing.
@@ -103,6 +109,10 @@ final class const DeviceSettings({
   /// These settings with [key] having answered last ([askWith]).
   DeviceSettings withAskWith(String key) => _copy(askWith: key);
 
+  /// These settings with the assistant [key] asked at [effort].
+  DeviceSettings withAskEffort(String key, LlmEffort effort) =>
+      _copy(askEfforts: {...askEfforts, key: effort});
+
   /// These settings with writing checked as it is written [on] or off.
   DeviceSettings withCheckGrammar(bool on) => _copy(checkGrammar: on);
 
@@ -117,6 +127,7 @@ final class const DeviceSettings({
     Object? customSearchUrl = _keep,
     double? pdfSidebarShare,
     Object? askWith = _keep,
+    Map<String, LlmEffort>? askEfforts,
     bool? checkGrammar,
   }) => DeviceSettings(
     appearance: appearance ?? this.appearance,
@@ -133,6 +144,7 @@ final class const DeviceSettings({
         : customSearchUrl as String?,
     pdfSidebarShare: pdfSidebarShare ?? this.pdfSidebarShare,
     askWith: identical(askWith, _keep) ? this.askWith : askWith as String?,
+    askEfforts: askEfforts ?? this.askEfforts,
     checkGrammar: checkGrammar ?? this.checkGrammar,
   );
 
@@ -148,6 +160,7 @@ final class const DeviceSettings({
     customSearchUrl,
     pdfSidebarShare,
     askWith,
+    askEfforts,
     checkGrammar,
   ];
 }

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/bloc/card_proposals_cubit.dart

@@ -64,10 +64,6 @@ class CardProposalsCubit({
 }) extends Cubit<CardProposalsState> {
   this : super(const CardProposalsState());
 
-  /// How long the answer may be, in tokens: room for every card of a
-  /// proposal, as a conversation's answer has.
-  static const maxOutputTokens = 4096;
-
   StreamSubscription<LlmEvent>? _proposing;
   Completer<void>? _proposed;
 
@@ -94,7 +90,9 @@ class CardProposalsCubit({
             messages: [
               LlmMessage.user([LlmText(text)]),
             ],
-            maxOutputTokens: maxOutputTokens,
+            // At the assistant's own effort, with room for its thinking
+            // and every card of a proposal (D63).
+            maxOutputTokens: _choice.outputCeilingAt(null),
             system: proposalPrompt(),
             tools: const [proposeCardsTool],
           ),

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/bloc/conversation_cubit.dart

@@ -121,6 +121,10 @@ class ConversationCubit({
   /// The language the app speaks to the person, as a BCP 47 tag, which a
   /// check is answered in.
   final String? _answerIn,
+
+  /// The effort every question asks at, one [_choice] offers (D63); null
+  /// for the assistant's own.
+  final LlmEffort? _effort,
 }) extends Cubit<ConversationState> {
   this
     : super(
@@ -130,10 +134,6 @@ class ConversationCubit({
         ),
       );
 
-  /// How long an answer may be, in tokens: a long explanation, not an
-  /// essay, so a limit isn't used up by one question.
-  static const maxOutputTokens = 4096;
-
   /// How many rounds of lookups a question gets: the round after is told
   /// to answer with what it found, and lookups asked for after that end
   /// the turn.
@@ -248,9 +248,12 @@ class ConversationCubit({
           choice,
           LlmRequest(
             messages: [...history, ...turn],
-            maxOutputTokens: maxOutputTokens,
+            // Room for the thinking its effort allows, which counts
+            // towards it, and the answer after.
+            maxOutputTokens: choice.outputCeilingAt(_effort),
             system: system,
             tools: tools,
+            effort: _effort,
           ),
           turn,
         );

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/widget/answerers.dart

@@ -1,6 +1,7 @@
 import 'package:halkyon_app/halkyon_app.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/bloc/conversation_cubit.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/model/assistant_conversation.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 
 /// Who answers a question asked in the field: the web search, or an
 /// assistant (ADR 0021).
@@ -37,6 +38,14 @@ AssistantChoice? assistantChoiceOf(AssistantsState state, AssistantRef ref) =>
       state,
     ).where((choice) => assistantRefOf(choice) == ref).firstOrNull;
 
+/// The effort [choice] is asked at by the person: the one this device last
+/// chose for it ([chosen], `DeviceSettings.askEfforts`) while the operator
+/// still allows it; null for the assistant's own (D63).
+LlmEffort? effortFor(AssistantChoice choice, Map<String, LlmEffort> chosen) {
+  final effort = chosen[assistantRefOf(choice).key];
+  return choice.efforts.contains(effort) ? effort : null;
+}
+
 /// Who answers the field's question among [answerers]: the one [picked]
 /// here, else the one that answered last ([askWith]), else an assistant
 /// agreed to, any assistant, the web search; null for none at all.

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/widget/asking.dart

@@ -10,6 +10,7 @@ import 'package:halkyon_learn_flutter/src/feature/assistant/model/assistant_topi
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/answerers.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/conversation_sheet.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/private_sends.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 import 'package:material_ui/material_ui.dart';
 
 /// The assistant asked where the app asks for the person, beyond the field
@@ -53,8 +54,8 @@ Future<bool> readyToAsk(
 
 /// Asks [choice] [question], with the parts [chosen], within [scope] for
 /// [task], in the conversation's sheet over the screen (D47), a new
-/// conversation called [title] where given, once [readyToAsk]. Whether it
-/// was asked.
+/// conversation called [title] where given, at [effort] (D63; the
+/// assistant's own where null), once [readyToAsk]. Whether it was asked.
 Future<bool> askAssistant(
   BuildContext context, {
   required AssistantChoice choice,
@@ -63,6 +64,7 @@ Future<bool> askAssistant(
   List<AssistantPart> chosen = const [],
   AssistantTask task = AssistantTask.ask,
   String? title,
+  LlmEffort? effort,
 }) async {
   if (!await readyToAsk(context, choice: choice, scope: scope) ||
       !context.mounted) {
@@ -82,6 +84,7 @@ Future<bool> askAssistant(
       title: title,
       question: question,
       chosen: chosen,
+      effort: effort,
     ),
   );
   return true;

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/widget/assistant_field.dart

@@ -19,6 +19,7 @@ import 'package:halkyon_learn_flutter/src/feature/assistant/widget/grammar_check
 import 'package:halkyon_learn_flutter/src/feature/settings/model/person_settings.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_repository.dart';
 import 'package:halkyon_learn_flutter/src/feature/studyset/model/studyset_tree.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 import 'package:halkyon_ui/halkyon_ui.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
 import 'package:material_ui/material_ui.dart';
@@ -273,6 +274,10 @@ class _AssistantFieldState() extends State<AssistantField> {
               question: question,
               chosen: chosen,
               task: task,
+              effort: effortFor(
+                choice,
+                context.read<DeviceSettingsBloc>().state.askEfforts,
+              ),
             ) ||
             !mounted) {
           return;
@@ -298,6 +303,10 @@ class _AssistantFieldState() extends State<AssistantField> {
       return const SizedBox.shrink();
     }
     final asksAssistant = answerer is AssistantAnswerer;
+    final askEfforts = context
+        .select<DeviceSettingsBloc, Map<String, LlmEffort>>(
+          (bloc) => bloc.state.askEfforts,
+        );
     final offered = _offered(answerer);
     final chips = offered.isNotEmpty || asksAssistant;
     final shape = chips
@@ -420,25 +429,41 @@ class _AssistantFieldState() extends State<AssistantField> {
                     crossAxisAlignment: CrossAxisAlignment.stretch,
                     children: [
                       _Parts(
-                        leading: asksAssistant
-                            ? _ScopeChip(
-                                reaches: [
-                                  AssistantReach.ticked,
-                                  if (widget.topic.studysetId != null)
-                                    AssistantReach.studyset,
-                                  if (widget.topic.studysetId != null &&
-                                      _nested == true)
-                                    AssistantReach.tree,
-                                  AssistantReach.library,
-                                ],
-                                reach: _reach,
-                                includePrivate: _includePrivate,
-                                onReach: (reach) =>
-                                    setState(() => _reach = reach),
-                                onIncludePrivate: (on) =>
-                                    setState(() => _includePrivate = on),
-                              )
-                            : null,
+                        leading: [
+                          if (asksAssistant)
+                            _ScopeChip(
+                              reaches: [
+                                AssistantReach.ticked,
+                                if (widget.topic.studysetId != null)
+                                  AssistantReach.studyset,
+                                if (widget.topic.studysetId != null &&
+                                    _nested == true)
+                                  AssistantReach.tree,
+                                AssistantReach.library,
+                              ],
+                              reach: _reach,
+                              includePrivate: _includePrivate,
+                              onReach: (reach) =>
+                                  setState(() => _reach = reach),
+                              onIncludePrivate: (on) =>
+                                  setState(() => _includePrivate = on),
+                            ),
+                          if (answerer case AssistantAnswerer(:final choice)
+                              when choice.efforts.isNotEmpty)
+                            if (choice.effort case final standard?)
+                              _EffortChip(
+                                efforts: choice.efforts,
+                                standard: standard,
+                                chosen: effortFor(choice, askEfforts),
+                                onChosen: (effort) =>
+                                    context.read<DeviceSettingsBloc>().add(
+                                      DeviceSettingsEventEffortChosen(
+                                        answerer.key,
+                                        effort,
+                                      ),
+                                    ),
+                              ),
+                        ],
                         parts: offered,
                         chosen: _chosen,
                         onToggle: (part) => setState(
@@ -480,17 +505,31 @@ class const _Picker({
         child: sign,
       );
     }
+    MenuItemButton item(Answerer answerer, {Color? color}) => MenuItemButton(
+      leadingIcon: Icon(_iconOf(answerer), color: color),
+      trailingIcon: answerer.key == current.key
+          ? const Icon(LucideIcons.check)
+          : null,
+      onPressed: () => onPicked(answerer),
+      child: _AnswererLabel(answerer: answerer),
+    );
     return MenuAnchor(
       menuChildren: [
-        for (final answerer in answerers)
-          MenuItemButton(
-            leadingIcon: Icon(_iconOf(answerer)),
-            trailingIcon: answerer.key == current.key
-                ? const Icon(LucideIcons.check)
-                : null,
-            onPressed: () => onPicked(answerer),
-            child: _AnswererLabel(answerer: answerer),
+        for (final answerer in answerers.whereType<WebAnswerer>())
+          item(answerer),
+        // The assistants under their providers' names, in their colours
+        // (D60), so where a question goes shows before it goes.
+        for (final (provider, group) in byProvider(
+          answerers.whereType<AssistantAnswerer>(),
+          (answerer) => answerer.choice.host,
+        )) ...[
+          Padding(
+            padding: const EdgeInsets.fromLTRB(12, 10, 12, 4),
+            child: ProviderLabel(provider),
           ),
+          for (final answerer in group)
+            item(answerer, color: providerColorIn(context, provider)),
+        ],
       ],
       builder: (context, controller, _) => IconButton(
         tooltip: l10n.assistantChoose,
@@ -612,12 +651,65 @@ class const _ScopeChip({
   }
 }
 
+/// How much the assistant thinks before it answers, as a chip after the
+/// scope's (D63): its menu holds the [efforts] the operator allows, the
+/// assistant's own ([standard]) marked so; [chosen] is the one this device
+/// asks it at, null for its own.
+class const _EffortChip({
+  required final List<LlmEffort> efforts,
+  required final LlmEffort standard,
+  required final LlmEffort? chosen,
+  required final ValueChanged<LlmEffort> onChosen,
+}) extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final words = HalkyonAppLocalizations.of(context);
+    final theme = Theme.of(context);
+    final shown = chosen ?? standard;
+    return MenuAnchor(
+      menuChildren: [
+        for (final each in efforts)
+          MenuItemButton(
+            leadingIcon: each == shown
+                ? const Icon(LucideIcons.check)
+                : const SizedBox.square(dimension: 24),
+            onPressed: () => onChosen(each),
+            child: Text(
+              each == standard
+                  ? l10n.assistantEffortDefault(
+                      assistantEffortName(words, each),
+                    )
+                  : assistantEffortName(words, each),
+            ),
+          ),
+      ],
+      builder: (context, controller, _) => FilterChip(
+        visualDensity: VisualDensity.compact,
+        showCheckmark: false,
+        selected: shown != standard,
+        tooltip: l10n.assistantEffortTooltip,
+        avatar: Icon(LucideIcons.brain, color: theme.colorScheme.primary),
+        label: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Text(assistantEffortName(words, shown)),
+            const SizedBox(width: 4),
+            const Icon(LucideIcons.chevronDown, size: 14),
+          ],
+        ),
+        onSelected: (_) =>
+            controller.isOpen ? controller.close() : controller.open(),
+      ),
+    );
+  }
+}
+
 /// The parts that can go along, as chips flowing onto as many lines as
-/// they need, after [leading] where there is one, each showing as much of
-/// its text as its line holds; the whole of it on hovering or a long
-/// press.
+/// they need, after [leading], each showing as much of its text as its
+/// line holds; the whole of it on hovering or a long press.
 class const _Parts({
-  required final Widget? leading,
+  required final List<Widget> leading,
   required final List<AssistantPart> parts,
   required final Set<AssistantPart> chosen,
   required final ValueChanged<AssistantPart> onToggle,
@@ -628,7 +720,6 @@ class const _Parts({
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
-    final leading = this.leading;
     return Padding(
       padding: const EdgeInsets.fromLTRB(8, 10, 8, 2),
       // At most about three lines of chips; more scroll.
@@ -640,7 +731,7 @@ class const _Parts({
               spacing: 8,
               runSpacing: 8,
               children: [
-                ?leading,
+                ...leading,
                 for (final part in parts)
                   Tooltip(
                     // An image's text is its asset row's id.

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/widget/conversation_history.dart

@@ -4,6 +4,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:halkyon_app/halkyon_app.dart';
 import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
 import 'package:halkyon_learn_flutter/src/core/dependencies/person_dependencies.dart';
+import 'package:halkyon_learn_flutter/src/core/device_settings/bloc/device_settings_bloc.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/model/assistant_conversation.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/answerers.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/assistant_words.dart';
@@ -157,6 +158,7 @@ class const _ConversationTile({
         // The conversation's sheet over the screen, not over this list,
         // opened from the navigator, which outlives the list.
         final navigator = Navigator.of(context)..pop();
+        final efforts = context.read<DeviceSettingsBloc>().state.askEfforts;
         unawaited(
           showConversation(
             navigator.context,
@@ -166,6 +168,8 @@ class const _ConversationTile({
             scope: scope,
             task: conversation.task,
             conversationId: conversation.id,
+            // Its follow-ups at the effort the person asks it at (D63).
+            effort: choice == null ? null : effortFor(choice, efforts),
           ),
         );
       },

apps/learn/halkyon_learn_flutter/lib/src/feature/assistant/widget/conversation_sheet.dart

@@ -18,6 +18,7 @@ import 'package:halkyon_learn_flutter/src/feature/assistant/model/assistant_topi
 import 'package:halkyon_learn_flutter/src/feature/assistant/model/turn_view.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/assistant_words.dart';
 import 'package:halkyon_learn_flutter/src/feature/assistant/widget/private_sends.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 import 'package:halkyon_ui/halkyon_ui.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
 import 'package:material_ui/material_ui.dart';
@@ -40,6 +41,10 @@ Future<void> showConversation(
   String? conversationId,
   String? question,
   List<AssistantPart> chosen = const [],
+
+  /// The effort its questions ask at, one the assistant offers (D63); null
+  /// for its own.
+  LlmEffort? effort,
 }) {
   final person = PersonDependencies.of(context);
   final cubit = ConversationCubit(
@@ -53,6 +58,7 @@ Future<void> showConversation(
     task: task,
     title: title,
     answerIn: Localizations.localeOf(context).toLanguageTag(),
+    effort: effort,
   );
   unawaited(() async {
     await cubit.open();

apps/learn/halkyon_learn_flutter/test/core/device_settings/device_settings_bloc_test.dart

@@ -2,6 +2,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:halkyon_learn_flutter/src/core/citation/model/citation.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/bloc/device_settings_bloc.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/model/device_settings.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 
 import '../../support/memory_device_settings_store.dart';
 
@@ -128,6 +129,44 @@ void main() {
     expect(asked.withLanguage('de').askWith, 'assistant:claude');
   });
 
+  test('the effort an assistant is asked at, kept per assistant with the '
+      'rest (D63)', () async {
+    final store = MemoryDeviceSettingsStore();
+    final bloc =
+        DeviceSettingsBloc(
+          store,
+          const DeviceSettings(askWith: 'assistant:opus'),
+        )..add(
+          const DeviceSettingsEventEffortChosen(
+            'assistant:opus',
+            LlmEffort.high,
+          ),
+        );
+    addTearDown(bloc.close);
+
+    const chosen = DeviceSettings(
+      askWith: 'assistant:opus',
+      askEfforts: {'assistant:opus': LlmEffort.high},
+    );
+    await next(bloc, chosen);
+    bloc.add(
+      const DeviceSettingsEventEffortChosen('assistant:haiku', LlmEffort.low),
+    );
+    await next(
+      bloc,
+      const DeviceSettings(
+        askWith: 'assistant:opus',
+        askEfforts: {
+          'assistant:opus': LlmEffort.high,
+          'assistant:haiku': LlmEffort.low,
+        },
+      ),
+    );
+    await pumpEventQueue();
+    expect(store.writes.first, chosen);
+    expect(store.writes.last.withLanguage('de').askEfforts, hasLength(2));
+  });
+
   test('the search engine chosen, and back to the default, keep the rest', () {
     const before = DeviceSettings(assistant: true, language: 'de');
 

apps/learn/halkyon_learn_flutter/test/core/device_settings/device_settings_store_test.dart

@@ -4,6 +4,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:halkyon_learn_flutter/src/core/citation/model/citation.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/data/device_settings_store.dart';
 import 'package:halkyon_learn_flutter/src/core/device_settings/model/device_settings.dart';
+import 'package:halkyon_llm/halkyon_llm.dart';
 
 void main() {
   late Directory folder;
@@ -102,6 +103,29 @@ void main() {
     expect((await FileDeviceSettingsStore(file).read()).askWith, 'own:o-1');
   });
 
+  test('keeps the effort each assistant was last asked at, and reads none '
+      'it knows not (D63)', () async {
+    expect((await store.read()).askEfforts, isEmpty);
+
+    await store.write(
+      const DeviceSettings(
+        askEfforts: {'assistant:opus': LlmEffort.high},
+      ),
+    );
+
+    expect((await FileDeviceSettingsStore(file).read()).askEfforts, {
+      'assistant:opus': LlmEffort.high,
+    });
+
+    file.writeAsStringSync(
+      '{"askEfforts": {"assistant:opus": "deep", "assistant:haiku": "low", '
+      '"assistant:sonnet": 3}}',
+    );
+    expect((await FileDeviceSettingsStore(file).read()).askEfforts, {
+      'assistant:haiku': LlmEffort.low,
+    });
+  });
+
   test('reads a file from before the hand-off went (ADR 0022), and writes '
       'it anew without the assistant chosen', () async {
     file.writeAsStringSync(

apps/learn/halkyon_learn_flutter/test/feature/assistant/bloc/card_proposals_cubit_test.dart

@@ -80,6 +80,12 @@ void main() {
     expect(assistant, 'claude');
     expect(request.tools, [proposeCardsTool]);
     expect(request.system, proposalPrompt());
+    expect(
+      request.effort,
+      isNull,
+      reason: "the assistant's own effort: nobody chose one here (D63)",
+    );
+    expect(request.maxOutputTokens, LlmEffort.defaultOutputCeiling);
     expect(
       (request.messages.single.parts.single as LlmText).text,
       'Verbs: 食べる is to eat.',

apps/learn/halkyon_learn_flutter/test/feature/assistant/bloc/conversation_cubit_test.dart

@@ -131,6 +131,7 @@ void main() {
     AssistantGateway? asking,
     AssistantTask task = AssistantTask.ask,
     String? title,
+    LlmEffort? effort,
   }) => ConversationCubit(
     assistants: AssistantRepository(asking ?? gateway),
     lookups: lookups,
@@ -141,6 +142,7 @@ void main() {
     conversationId: conversationId,
     task: task,
     title: title,
+    effort: effort,
     answerIn: 'en',
   );
 
@@ -182,7 +184,12 @@ void main() {
 
     final (assistant, request) = gateway.asked.single;
     expect(assistant, 'claude');
-    expect(request.maxOutputTokens, ConversationCubit.maxOutputTokens);
+    expect(
+      request.maxOutputTokens,
+      LlmEffort.defaultOutputCeiling,
+      reason: "the model's own effort thinks within the default ceiling",
+    );
+    expect(request.effort, isNull);
     expect(request.tools, isEmpty, reason: 'only what is ticked goes (D50)');
     expect(request.system, contains('nothing to look up'));
 
@@ -195,6 +202,60 @@ void main() {
     await conversation.close();
   });
 
+  test('asks every question at the effort the person chose, with its '
+      'ceiling (D63)', () async {
+    const thinking = OfferedAssistant(
+      id: 'claude',
+      name: 'Claude',
+      protocol: 'anthropic',
+      host: 'api.anthropic.com',
+      model: 'claude-opus',
+      effort: LlmEffort.low,
+      efforts: [LlmEffort.low, LlmEffort.medium, LlmEffort.high],
+    );
+    final conversation = cubit(
+      choice: const GrantedAssistant(thinking),
+      effort: LlmEffort.high,
+    );
+    await conversation.open();
+    gateway.answers
+      ..add(_says('Because it joins.'))
+      ..add(_says('Yes.'));
+
+    await conversation.ask('Why て-form?', const []);
+    await conversation.ask('Always?', const []);
+
+    for (final (_, request) in gateway.asked) {
+      expect(request.effort, LlmEffort.high);
+      expect(request.maxOutputTokens, LlmEffort.high.outputCeiling);
+    }
+    expect(gateway.asked, hasLength(2));
+    await conversation.close();
+  });
+
+  test("without an effort chosen, it asks at the assistant's, within its "
+      'ceiling', () async {
+    const thinking = OfferedAssistant(
+      id: 'claude',
+      name: 'Claude',
+      protocol: 'anthropic',
+      host: 'api.anthropic.com',
+      model: 'claude-opus',
+      effort: LlmEffort.low,
+      efforts: [LlmEffort.low, LlmEffort.medium],
+    );
+    final conversation = cubit(choice: const GrantedAssistant(thinking));
+    await conversation.open();
+    gateway.answers.add(_says('Because it joins.'));
+
+    await conversation.ask('Why て-form?', const []);
+
+    final (_, request) = gateway.asked.single;
+    expect(request.effort, isNull, reason: 'the instance applies its own');
+    expect(request.maxOutputTokens, LlmEffort.low.outputCeiling);
+    await conversation.close();
+  });
+
   test('sends the conversation so far with a follow-up, and keeps it in the '
       'same conversation', () async {
     final conversation = cubit();