Merge branch 'phase/43-whisper'

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-20 10:40:35 +03:00
parent 9c49c8b3a6 089917025a
commit f45347b335
23 changed files with 1062 additions and 37 deletions
@@ -133,6 +133,9 @@
 **педагогикой** учителя: сильный педагог после похвалы плюсует больше, слабый выговор злит
 сильнее. Оценок по-прежнему нет.

+Шёпот на уроке — действие `Whisper` в кабинете (`Classroom`); обычный `Chat` на уроке не
+стартует. Доля роста навыка, шанс оборвать и веса разговора после звонка — поля `BehaviorDef`.
+
 ### Дом

 Родители на карту не приходят. **Одно** семейное событие на человека за рабочее утро; skip
@@ -11,22 +11,22 @@

 ## Задачи

- [ ] Тема с тегом шёпота может стартовать кружок на уроке в кабинете класса
- [ ] У участников на время шёпота режется рост навыка урока (доля в `BehaviorDef`)
- [ ] Учитель в том же кабинете: шанс оборвать (данные + черты); не 100 %
- [ ] Пойманный шёпот → выговор (кружок учитель + ученики, тема дисциплины), мнения как у
+- [x] Тема с тегом шёпота может стартовать кружок на уроке в кабинете класса
+- [x] У участников на время шёпота режется рост навыка урока (доля в `BehaviorDef`)
+- [x] Учитель в том же кабинете: шанс оборвать (данные + черты); не 100 %
+- [x] Пойманный шёпот → выговор (кружок учитель + ученики, тема дисциплины), мнения как у
      строгого разговора
- [ ] После урока учитель может взять 2–4 учеников (вопрос / похвала / выговор) по весу цели
- [ ] Сдвиг мнения ученика об учителе масштабируется педагогикой (поле навыка, не фамилия)
- [ ] Лог: «шептались», «учитель оборвал»
+- [x] После урока учитель может взять 2–4 учеников (вопрос / похвала / выговор) по весу цели
+- [x] Сдвиг мнения ученика об учителе масштабируется педагогикой (поле навыка, не фамилия)
+- [x] Лог: «шептались», «учитель оборвал»

 ## Тесты, без которых фаза не закрыта

- [ ] Шёпот на уроке даёт меньше прироста предмета, чем тихий урок без кружка
- [ ] При фиксированном сиде не каждый шёпот с учителем в кабинете обрывается
- [ ] Без учителя в узле шёпот не обрывается этим правилом
- [ ] Учитель с высокой педагогикой после похвалы сильнее плюсует мнение, чем с низкой
- [ ] Обычный не-шёпотный `Chat` на уроке не стартует
+- [x] Шёпот на уроке даёт меньше прироста предмета, чем тихий урок без кружка
+- [x] При фиксированном сиде не каждый шёпот с учителем в кабинете обрывается
+- [x] Без учителя в узле шёпот не обрывается этим правилом
+- [x] Учитель с высокой педагогикой после похвалы сильнее плюсует мнение, чем с низкой
+- [x] Обычный не-шёпотный `Chat` на уроке не стартует

 ## Критерий готовности

@@ -203,7 +203,7 @@
 | Фаза | Статус | Зачем |
 | --- | --- | --- |
 | [42. Темы и кружки](42-talk-circles.md) | ✅ | `TopicDef`, 2–4 человека, учительская, телефон, вместе |
-| [43. Шёпот и учитель](43-whisper.md) | 🔄 | Шёпот на уроке, шанс оборвать, разговор после звонка |
+| [43. Шёпот и учитель](43-whisper.md) | ✅ | Шёпот на уроке, шанс оборвать, разговор после звонка |

 42 стоит на 41; 43 — на 42.

@@ -250,7 +250,7 @@ public static class DecisionPlanner
        OccupiedCount occupied,
        ActionDef action)
    {
-        if (action.Abstract || action.Weight <= 0 || !RoleFits(action, state))
+        if (action.Abstract || !RoleFits(action, state))
        {
            return Intent.None;
        }
@@ -260,6 +260,32 @@ public static class DecisionPlanner
            return Intent.None;
        }

+        if (TalkActions.IsTeacherTalk(action.DefName))
+        {
+            if (state.BoundToLesson)
+            {
+                return Intent.None;
+            }
+
+            var teacherWeight = catalog.BehaviorRules?.TeacherAfterLessonWeight ?? 0f;
+            if (teacherWeight <= 0)
+            {
+                return Intent.None;
+            }
+
+            if (RoomFor(catalog, map, walks, state, occupied, action) is null)
+            {
+                return Intent.None;
+            }
+
+            return new Intent(GoalKind.Leisure, action.DefName, teacherWeight, action.DefName);
+        }
+
+        if (action.Weight <= 0)
+        {
+            return Intent.None;
+        }
+
        if (action.DefName.Equals(TalkActions.PhoneChat, StringComparison.Ordinal) && !state.Talk.HasPhone)
        {
            return Intent.None;
@@ -371,7 +397,8 @@ public static class DecisionPlanner
        {
            if (action.Abstract
                || !need.Equals(action.Need, StringComparison.Ordinal)
-                || !RoleFits(action, state))
+                || !RoleFits(action, state)
+                || (state.BoundToLesson && TalkCircles.BlocksOnLesson(action.DefName)))
            {
                continue;
            }
@@ -18,7 +18,8 @@ public readonly record struct TalkPlannerContext(
 /// </summary>
 public static class TalkCircles
 {
-    public static bool BlocksOnLesson(string actionId) => TalkActions.IsTalk(actionId);
+    public static bool BlocksOnLesson(string actionId) =>
+        TalkActions.IsTalk(actionId) && !TalkActions.IsWhisper(actionId);

    public static int MaxSize(string actionId, BehaviorDef? rules, IReadOnlyList<string> traitIds, DefCatalog catalog)
    {
@@ -27,6 +28,12 @@ public static class TalkCircles
            return 2;
        }

+        if (actionId.Equals(TalkActions.TeacherTalk, StringComparison.Ordinal))
+        {
+            // Teacher plus 2–4 pupils; the live-circle cap of 4 is the pupil side.
+            return 1 + Math.Clamp(rules?.TalkCircleMax ?? 4, 2, 4);
+        }
+
        var max = rules?.TalkCircleMax ?? 4;
        foreach (var traitId in traitIds)
        {
@@ -182,14 +189,16 @@ public static class TalkCircles
        DefCatalog catalog,
        Person picker,
        int age,
-        int seed)
+        int seed,
+        bool whisperOnLesson = false)
    {
        var candidates = new List<(TopicDef Topic, float Weight)>();
        foreach (var topic in catalog.Topics.Values)
        {
            if (topic.Abstract
                || !RoleFitsTopic(topic, picker.IsStudent, picker.IsStaff, picker.IsParent)
-                || !AgeFits(topic, age))
+                || !AgeFits(topic, age)
+                || (whisperOnLesson && !topic.WhisperOnLesson))
            {
                continue;
            }
@@ -368,6 +377,102 @@ public static class TalkCircles
            .ToArray();
    }

+    /// <summary>0…1 from a mixed seed. Same seed, same roll — never <c>string.GetHashCode</c>.</summary>
+    public static float Roll01(int seed)
+    {
+        var unit = (seed & int.MaxValue) / (float)int.MaxValue;
+        return Math.Clamp(unit, 0f, 1f);
+    }
+
+    /// <summary>Traits multiply: quiet dampens, outgoing raises, missing stays 1.</summary>
+    public static float WhisperCatchMultiplier(IReadOnlyList<string> traitIds, DefCatalog catalog)
+    {
+        var factor = 1f;
+        foreach (var traitId in traitIds)
+        {
+            if (catalog.Traits.TryGetValue(traitId, out var trait) && trait.WhisperCatchMultiplier > 0f)
+            {
+                factor *= trait.WhisperCatchMultiplier;
+            }
+        }
+
+        return factor;
+    }
+
+    /// <summary>
+    /// True when this roll catches a whisper. <paramref name="catchMax"/> keeps it below 100 %
+    /// even with loud traits.
+    /// </summary>
+    public static bool WhisperCaught(float roll, float baseChance, float catchMax, float traitMultiplier)
+    {
+        var ceiling = Math.Clamp(catchMax, 0f, 0.99f);
+        var chance = Math.Clamp(baseChance * Math.Max(0f, traitMultiplier), 0f, ceiling);
+        return chance > 0f && roll < chance;
+    }
+
+    /// <summary>
+    /// Pupil → teacher opinion after talk. Pedagogy 50 is identity; a strong teacher after praise
+    /// pluses more, a weak reprimand angers more.
+    /// </summary>
+    public static int ScaleByPedagogy(int delta, float pedagogy, BehaviorDef? rules)
+    {
+        if (delta == 0)
+        {
+            return 0;
+        }
+
+        var t = (Math.Clamp(pedagogy, 0f, 100f) - 50f) / 50f;
+        var k = rules?.TalkPedagogyOpinionScale ?? 0.4f;
+        var scale = delta > 0 ? 1f + (t * k) : 1f - (t * k);
+        var scaled = (int)Math.Round(delta * Math.Max(0.1f, scale), MidpointRounding.AwayFromZero);
+        if (delta > 0)
+        {
+            return Math.Max(1, scaled);
+        }
+
+        return Math.Min(-1, scaled);
+    }
+
+    public static string? PickTeacherTopic(DefCatalog catalog, BehaviorDef? rules, int seed)
+    {
+        var options = new (string Id, float Weight)[]
+        {
+            (TeacherTopics.Question, rules?.TeacherQuestionWeight ?? 2f),
+            (TeacherTopics.Praise, rules?.TeacherPraiseWeight ?? 2f),
+            (TeacherTopics.Discipline, rules?.TeacherReprimandWeight ?? 1f),
+        };
+        var available = new List<(string Id, float Weight)>();
+        foreach (var option in options)
+        {
+            if (option.Weight > 0f && catalog.Topics.ContainsKey(option.Id))
+            {
+                available.Add(option);
+            }
+        }
+
+        if (available.Count == 0)
+        {
+            return catalog.Topics.Values.FirstOrDefault(topic => !topic.Abstract)?.DefName;
+        }
+
+        var total = available.Sum(pair => pair.Weight);
+        var roll = Roll01(seed) * total;
+        var cursor = 0f;
+        foreach (var (id, weight) in available.OrderBy(pair => pair.Id, StringComparer.Ordinal))
+        {
+            cursor += weight;
+            if (roll <= cursor)
+            {
+                return id;
+            }
+        }
+
+        return available[^1].Id;
+    }
+
+    public static float LessonWhisperFactor(string? actionId, BehaviorDef? rules) =>
+        TalkActions.IsWhisper(actionId) ? rules?.LessonWhisperSkillFactor ?? 0.4f : 1f;
+
    public readonly record struct Candidate(
        string Id,
        string? ClassId,
@@ -261,6 +261,11 @@ internal static class PeopleDefValidator
                throw new ContentLoadException($"TraitDef '{trait.DefName}' skill modifier references unknown SkillDef '{modifier.Skill}'.");
            }
        }
+
+        if (trait.WhisperCatchMultiplier < 0f)
+        {
+            throw new ContentLoadException($"TraitDef '{trait.DefName}' whisperCatchMultiplier cannot be negative.");
+        }
    }

    private static void ValidateNeed(NeedDef need)
@@ -574,6 +579,39 @@ internal static class PeopleDefValidator
            throw new ContentLoadException(
                $"BehaviorDef '{behavior.DefName}' talk circle size must be at least 2 with max ≥ min.");
        }
+
+        if (behavior.LessonWhisperSkillFactor is < 0f or > 1f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' lessonWhisperSkillFactor must be 0–1.");
+        }
+
+        if (behavior.WhisperCatchChance is < 0f or > 1f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' whisperCatchChance must be 0–1.");
+        }
+
+        if (behavior.WhisperCatchMax is < 0f or > 1f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' whisperCatchMax must be 0–1.");
+        }
+
+        if (behavior.WhisperStartChance is < 0f or > 1f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' whisperStartChance must be 0–1.");
+        }
+
+        if (behavior.TalkPedagogyOpinionScale < 0f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' talkPedagogyOpinionScale cannot be negative.");
+        }
+
+        if (behavior.TeacherAfterLessonWeight < 0f
+            || behavior.TeacherQuestionWeight < 0f
+            || behavior.TeacherPraiseWeight < 0f
+            || behavior.TeacherReprimandWeight < 0f)
+        {
+            throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' teacher-talk weights cannot be negative.");
+        }
    }

    private static void ValidateTopic(TopicDef topic, DefCatalog catalog)
@@ -611,10 +649,7 @@ internal static class PeopleDefValidator
    private static void RequireTalkTopics(DefCatalog catalog)
    {
        var hasTalkAction = catalog.Actions.Values.Any(action =>
-            !action.Abstract
-            && (action.DefName.Equals(TalkActions.Chat, StringComparison.Ordinal)
-                || action.DefName.Equals(TalkActions.StaffChat, StringComparison.Ordinal)
-                || action.DefName.Equals(TalkActions.PhoneChat, StringComparison.Ordinal)));
+            !action.Abstract && TalkActions.IsTalk(action.DefName));
        if (!hasTalkAction)
        {
            return;
@@ -210,6 +210,11 @@ public sealed class TraitDef : Def

    /// <summary>Pull toward topics carrying these tags when this person picks the subject.</summary>
    public IReadOnlyList<TopicTagWeight> TalkTagWeights { get; init; } = [];
+
+    /// <summary>
+    /// Multiplies the chance a whisper is caught. Quiet below 1, outgoing above. Missing is 1.
+    /// </summary>
+    public float WhisperCatchMultiplier { get; init; } = 1f;
 }

 /// <summary>Conversation subject. Tags gate appropriateness; language is optional skill help.</summary>
@@ -415,6 +420,37 @@ public sealed class BehaviorDef : Def
    /// <summary>Opinion at or below — enemy; never invited, lunch nodes avoided.</summary>
    public int TalkEnemyThreshold { get; init; } = -40;

+    /// <summary>
+    /// Lesson skill multiplier while the pupil is in a whisper circle. Missing keeps a cut, not
+    /// a skipped lesson — whispering is costly, not a free skip.
+    /// </summary>
+    public float LessonWhisperSkillFactor { get; init; } = 0.4f;
+
+    /// <summary>Base chance the teacher notices one whisper circle. Traits scale it; never 1.</summary>
+    public float WhisperCatchChance { get; init; } = 0.4f;
+
+    /// <summary>Ceiling after traits. A pack cannot make every whisper a sure catch.</summary>
+    public float WhisperCatchMax { get; init; } = 0.85f;
+
+    /// <summary>
+    /// How far pedagogy 0…100 bends a pupil's opinion of the teacher. 50 is identity; above it
+    /// praise grows and reprimand softens, below it the reverse.
+    /// </summary>
+    public float TalkPedagogyOpinionScale { get; init; } = 0.4f;
+
+    /// <summary>Leisure weight for a teacher taking pupils after the bell. Below lesson, above chat.</summary>
+    public float TeacherAfterLessonWeight { get; init; } = 4f;
+
+    /// <summary>Relative weights when the teacher picks question / praise / reprimand.</summary>
+    public float TeacherQuestionWeight { get; init; } = 2f;
+
+    public float TeacherPraiseWeight { get; init; } = 2f;
+
+    public float TeacherReprimandWeight { get; init; } = 1f;
+
+    /// <summary>Per-decision chance a pupil in class tries to start a whisper, before initiative.</summary>
+    public float WhisperStartChance { get; init; } = 0.12f;
+
    public static IReadOnlyList<OpinionBand> DefaultOpinionBands { get; } =
    [
        new() { Min = 70, Id = "OpinionCloseFriend" },
@@ -6,12 +6,22 @@ public static class TalkActions
    public const string Chat = "Chat";
    public const string StaffChat = "StaffChat";
    public const string PhoneChat = "PhoneChat";
+    public const string Whisper = "Whisper";
+    public const string TeacherTalk = "TeacherTalk";

    public static bool IsTalk(string? actionId) =>
        actionId is not null
        && (actionId.Equals(Chat, StringComparison.Ordinal)
            || actionId.Equals(StaffChat, StringComparison.Ordinal)
-            || actionId.Equals(PhoneChat, StringComparison.Ordinal));
+            || actionId.Equals(PhoneChat, StringComparison.Ordinal)
+            || actionId.Equals(Whisper, StringComparison.Ordinal)
+            || actionId.Equals(TeacherTalk, StringComparison.Ordinal));
+
+    public static bool IsWhisper(string? actionId) =>
+        actionId is not null && actionId.Equals(Whisper, StringComparison.Ordinal);
+
+    public static bool IsTeacherTalk(string? actionId) =>
+        actionId is not null && actionId.Equals(TeacherTalk, StringComparison.Ordinal);
 }

 /// <summary>Vanilla topic tags from the social slice design doc.</summary>
@@ -26,3 +36,11 @@ public static class TopicTags
    public const string Rude = "rude";
    public const string Appearance = "appearance";
 }
+
+/// <summary>Teacher-after-lesson and reprimand topics in core. Names match TopicDef ids.</summary>
+public static class TeacherTopics
+{
+    public const string Question = "TopicQuestion";
+    public const string Praise = "TopicPraise";
+    public const string Discipline = "TopicDiscipline";
+}
@@ -17,6 +17,7 @@ public static class Seed
    public const int NativeLanguageSalt = 9;
    public const int ClimatePresetSalt = 10;
    public const int ApparelSalt = 11;
+    public const int WhisperSalt = 12;

    /// <summary>A stream that belongs to the school rather than to one family.</summary>
    public static int ForSchool(int schoolSeed, int salt) => Mix(schoolSeed, familyIndex: -1, salt);
@@ -54,6 +54,24 @@
    "roles": ["student"],
    "weight": 2,
  },
+  {
+    "defName": "Whisper",
+    "room": "Classroom",
+    "minutes": 6,
+    "need": "Social",
+    "needGain": 0.15,
+    "roles": ["student"],
+    "weight": 2,
+  },
+  {
+    "defName": "TeacherTalk",
+    "room": "Classroom",
+    "minutes": 8,
+    "need": "Social",
+    "needGain": 0.3,
+    "roles": ["staff"],
+    "weight": 0,
+  },
  {
    "defName": "WalkCorridor",
    "room": "Corridor",
@@ -74,8 +74,18 @@
  "talkNoLanguageOpinionMultiplier": 0.15,
  "talkPhoneOpinionMultiplier": 0.5,
  "talkCommunicationOpinionScale": 0.5,
-  "talkCircleMin": 2,
-  "talkCircleMax": 4,
-  "talkFriendThreshold": 40,
-  "talkEnemyThreshold": -40,
+    "talkCircleMin": 2,
+    "talkCircleMax": 4,
+    "talkFriendThreshold": 40,
+    "talkEnemyThreshold": -40,
+    // Whisper on lesson (slice 9 phase 43). Catch chance is not 1 even with loud traits.
+    "lessonWhisperSkillFactor": 0.4,
+    "whisperCatchChance": 0.4,
+    "whisperCatchMax": 0.85,
+    "whisperStartChance": 0.12,
+    "talkPedagogyOpinionScale": 0.4,
+    "teacherAfterLessonWeight": 4,
+    "teacherQuestionWeight": 2,
+    "teacherPraiseWeight": 2,
+    "teacherReprimandWeight": 1,
 }
@@ -3,6 +3,7 @@
    "defName": "TopicStudy",
    "tags": ["study"],
    "roles": ["student", "staff"],
+    "whisperOnLesson": true,
    "opinionShift": 2,
  },
  {
@@ -10,12 +11,14 @@
    "tags": ["games"],
    "roles": ["student"],
    "age": { "min": 7, "max": 18 },
+    "whisperOnLesson": true,
    "opinionShift": 3,
  },
  {
    "defName": "TopicFood",
    "tags": ["food"],
    "roles": ["student", "staff"],
+    "whisperOnLesson": true,
    "opinionShift": 2,
  },
  {
@@ -28,12 +31,14 @@
    "defName": "TopicSport",
    "tags": ["sport"],
    "roles": ["student", "staff"],
+    "whisperOnLesson": true,
    "opinionShift": 3,
  },
  {
    "defName": "TopicGossip",
    "tags": ["gossip"],
    "roles": ["student", "staff"],
+    "whisperOnLesson": true,
    "opinionShift": 1,
  },
  {
@@ -47,6 +52,25 @@
    "tags": ["appearance"],
    "roles": ["student"],
    "age": { "min": 11, "max": 18 },
+    "whisperOnLesson": true,
    "opinionShift": 1,
  },
+  {
+    "defName": "TopicQuestion",
+    "tags": ["study"],
+    "roles": ["student", "staff"],
+    "opinionShift": 2,
+  },
+  {
+    "defName": "TopicPraise",
+    "tags": ["study"],
+    "roles": ["student", "staff"],
+    "opinionShift": 4,
+  },
+  {
+    "defName": "TopicDiscipline",
+    "tags": ["study"],
+    "roles": ["student", "staff"],
+    "opinionShift": -6,
+  },
 ]
@@ -35,6 +35,7 @@
    "incompatible": ["Leader", "Bully"],
    "wageAsk": -8,
    "talkInitiative": 0.45,
+    "whisperCatchMultiplier": 0.55,
  },
  {
    "defName": "Leader",
@@ -42,6 +43,7 @@
    "incompatible": ["Quiet"],
    "wageAsk": 10,
    "talkInitiative": 1.6,
+    "whisperCatchMultiplier": 1.25,
    "skillModifiers": [
      { "skill": "History", "offset": 4 },
    ],
@@ -107,5 +109,6 @@
    "incompatible": ["Quiet"],
    "talkInitiative": 1.4,
    "talkCircleBonus": 1,
+    "whisperCatchMultiplier": 1.4,
  },
 ]
@@ -6,6 +6,8 @@
  "Chat": "Chat",
  "StaffChat": "Staff chat",
  "PhoneChat": "Phone chat",
+  "Whisper": "Whisper",
+  "TeacherTalk": "Teacher talk",
  "WalkCorridor": "Walk the corridor",
  "WalkYard": "Walk the yard",
  "Behavior": "Behavior rules",
@@ -194,6 +196,8 @@
  "ActionStarted": "started: {0}",
  "ActionEnded": "finished: {0}",
  "TalkEnded": "talked about {0}",
+  "Whispered": "whispered",
+  "TeacherInterrupted": "the teacher cut them off",
  "TopicStudy": "schoolwork",
  "TopicGames": "games",
  "TopicFood": "food",
@@ -202,6 +206,9 @@
  "TopicGossip": "gossip",
  "TopicRude": "rough talk",
  "TopicAppearance": "looks",
+  "TopicQuestion": "a subject question",
+  "TopicPraise": "praise",
+  "TopicDiscipline": "discipline",
  "ApparelReplaced": "got a new {0}",
  "ApparelChanged": "changed clothes: {0}",
  "LessonNoTeacher": "lesson without a teacher: {0}",
@@ -6,6 +6,8 @@
  "Chat": "Разговор",
  "StaffChat": "Разговор в учительской",
  "PhoneChat": "Разговор по телефону",
+  "Whisper": "Шёпот",
+  "TeacherTalk": "Разговор учителя",
  "WalkCorridor": "Прогулка по коридору",
  "WalkYard": "Прогулка во дворе",
  "Behavior": "Правила поведения",
@@ -194,6 +196,8 @@
  "ActionStarted": "начал: {0}",
  "ActionEnded": "закончил: {0}",
  "TalkEnded": "говорил о {0}",
+  "Whispered": "шептались",
+  "TeacherInterrupted": "учитель оборвал",
  "TopicStudy": "учёбе",
  "TopicGames": "играх",
  "TopicFood": "еде",
@@ -202,6 +206,9 @@
  "TopicGossip": "сплетнях",
  "TopicRude": "грубом",
  "TopicAppearance": "внешности",
+  "TopicQuestion": "вопросе по предмету",
+  "TopicPraise": "похвале",
+  "TopicDiscipline": "дисциплине",
  "ApparelReplaced": "получил новую {0}",
  "ApparelChanged": "переоделся: {0}",
  "LessonNoTeacher": "урок без учителя: {0}",
@@ -57,7 +57,12 @@ internal static class LessonLearningSystem
            in People,
            (ref PersonIdentity identity, ref PersonSkills skills, ref PersonTraits traits, ref PersonNeeds needs, ref PersonRoles roles, ref Presence presence, ref PersonActivity activity) =>
            {
-                if (activity.IsActive || !IsStanding(presence))
+                if (!IsStanding(presence))
+                {
+                    return;
+                }
+
+                if (activity.IsActive && !TalkActions.IsWhisper(activity.ActionId))
                {
                    return;
                }
@@ -98,6 +103,8 @@ internal static class LessonLearningSystem
                    school.TryLogLessonOnce(personId, PersonLogTypes.LessonNoTextbook, lesson.Subject);
                }

+                textbookFactor *= TalkCircles.LessonWhisperFactor(activity.ActionId, rules);
+
                IReadOnlyDictionary<string, float> taught = teacherSkills.TryGetValue(lesson.TeacherId, out var found)
                    ? found
                    : new Dictionary<string, float>(StringComparer.Ordinal);
@@ -13,6 +13,8 @@ public static class PersonLogTypes
    public const string ActionStarted = "action-started";
    public const string ActionEnded = "action-ended";
    public const string TalkEnded = "talk-ended";
+    public const string Whispered = "whispered";
+    public const string TeacherInterrupted = "teacher-interrupted";
    public const string ApparelReplaced = "apparel-replaced";
    public const string ApparelChanged = "apparel-changed";
    public const string LessonNoTeacher = "lesson-no-teacher";
@@ -29,6 +31,16 @@ public sealed record PersonLogEvent(string PersonId, DateTime Time, string Type,
    public string Caption(DefCatalog catalog, string locale)
    {
        ArgumentNullException.ThrowIfNull(catalog);
+        if (Type.Equals(PersonLogTypes.Whispered, StringComparison.Ordinal))
+        {
+            return catalog.Text(locale, "Whispered");
+        }
+
+        if (Type.Equals(PersonLogTypes.TeacherInterrupted, StringComparison.Ordinal))
+        {
+            return catalog.Text(locale, "TeacherInterrupted");
+        }
+
        if (ThingDef is null)
        {
            return Type;
@@ -333,7 +333,7 @@ internal static class PresenceSystem
            : slot.Kind == DaySlotKind.Lesson && lessons.Any(lesson => lesson.Period == slot.Index);
        if (activity.IsActive && TalkActions.IsTalk(activity.ActionId))
        {
-            if (!bound)
+            if (!bound || TalkActions.IsWhisper(activity.ActionId))
            {
                return null;
            }
@@ -432,7 +432,48 @@ internal static class PresenceSystem
            presence = PresenceStepper.StartWalk(presence, walks, decision.WalkTo, headingHome: false);
        }

-        return decision.StartAction is not null && !activity.IsActive ? decision.StartAction : null;
+        if (decision.StartAction is not null && !activity.IsActive)
+        {
+            return decision.StartAction;
+        }
+
+        if (!activity.IsActive
+            && decision.WalkTo is null
+            && ShouldStartWhisper(school, person, state))
+        {
+            return TalkActions.Whisper;
+        }
+
+        return null;
+    }
+
+    private static bool ShouldStartWhisper(School school, Person person, ActorState state)
+    {
+        if (!state.BoundToLesson
+            || !person.IsStudent
+            || state.IsWalking
+            || state.NodeId is null
+            || state.DutyRoom is null
+            || !state.NodeId.Equals(state.DutyRoom, StringComparison.Ordinal))
+        {
+            return false;
+        }
+
+        var location = school.Map?.NodeDef(state.NodeId);
+        if (location is null || !location.Equals("Classroom", StringComparison.Ordinal))
+        {
+            return false;
+        }
+
+        var rules = school.Catalog?.BehaviorRules;
+        var chance = (rules?.WhisperStartChance ?? 0.12f) * TalkCircles.Initiative(person.Traits, school.Catalog!);
+        var roll = TalkCircles.Roll01(
+            Seed.Mix(
+                school.PeopleSeed,
+                person.Id,
+                DateOnly.FromDateTime(school.Clock.Time).DayNumber,
+                Seed.WhisperSalt + (school.Clock.Time.Minute / 2)));
+        return TalkCircles.WhisperCaught(roll, chance, 0.5f, 1f);
    }

    private static Dictionary<(string Node, string Thing), int> SnapshotOccupied(School school, string exceptId)
@@ -18,6 +18,9 @@ internal sealed class ActiveTalkCircle
    public required List<string> Members { get; init; }

    public float RemainingMinutes { get; set; }
+
+    /// <summary>Set once a teacher in the room has rolled to notice this whisper.</summary>
+    public bool CatchChecked { get; set; }
 }

 /// <summary>Forms 2–4 person talk circles, applies outcomes, writes topic log lines.</summary>
@@ -59,7 +62,7 @@ internal static class TalkCircleSystem
        }

        var person = school.Roster.People.FirstOrDefault(row => row.Id.Equals(personId, StringComparison.Ordinal));
-        if (person is null)
+        if (person is null || !RoleFits(action, person))
        {
            return false;
        }
@@ -115,6 +118,11 @@ internal static class TalkCircleSystem
        {
            circle.RemainingMinutes -= minutes;
            SyncActivity(school, circle);
+            if (TalkActions.IsWhisper(circle.ActionId) && TryCatchWhisper(school, circle))
+            {
+                continue;
+            }
+
            if (circle.RemainingMinutes > 0)
            {
                continue;
@@ -173,7 +181,8 @@ internal static class TalkCircleSystem
    {
        var rules = school.Catalog!.BehaviorRules;
        var max = TalkCircles.MaxSize(action.DefName, rules, initiator.Traits, school.Catalog);
-        var candidates = GatherCandidates(school, initiator.Id, nodeId, requirePhone: false);
+        var studentsOnly = TalkActions.IsWhisper(action.DefName) || TalkActions.IsTeacherTalk(action.DefName);
+        var candidates = GatherCandidates(school, initiator.Id, nodeId, requirePhone: false, studentsOnly);
        var ranked = TalkCircles.RankInvitees(initiator, candidates, rules);
        var members = new List<string> { initiator.Id };
        foreach (var id in ranked)
@@ -186,7 +195,7 @@ internal static class TalkCircleSystem
            members.Add(id);
        }

-        var min = rules?.TalkCircleMin ?? 2;
+        var min = TalkActions.IsTeacherTalk(action.DefName) ? 3 : rules?.TalkCircleMin ?? 2;
        if (members.Count < min)
        {
            return false;
@@ -196,8 +205,17 @@ internal static class TalkCircleSystem
            school.Catalog,
            initiator,
            initiator.AgeOn(school.Clock.Time),
-            Seed.Mix(school.PeopleSeed, initiator.Id, DateOnly.FromDateTime(school.Clock.Time).DayNumber, Seed.ApparelSalt + 21))
-            ?? school.Catalog.Topics.Values.First(topic => !topic.Abstract).DefName;
+            Seed.Mix(school.PeopleSeed, initiator.Id, DateOnly.FromDateTime(school.Clock.Time).DayNumber, Seed.ApparelSalt + 21),
+            whisperOnLesson: TalkActions.IsWhisper(action.DefName));
+        if (TalkActions.IsTeacherTalk(action.DefName))
+        {
+            topicId = TalkCircles.PickTeacherTopic(
+                school.Catalog,
+                rules,
+                Seed.Mix(school.PeopleSeed, initiator.Id, DateOnly.FromDateTime(school.Clock.Time).DayNumber, Seed.WhisperSalt));
+        }
+
+        topicId ??= school.Catalog.Topics.Values.First(topic => !topic.Abstract).DefName;

        var circle = new ActiveTalkCircle
        {
@@ -216,6 +234,11 @@ internal static class TalkCircleSystem
    {
        var rules = school.Catalog!.BehaviorRules;
        var person = school.Roster!.People.First(row => row.Id.Equals(personId, StringComparison.Ordinal));
+        if ((TalkActions.IsWhisper(action.DefName) || TalkActions.IsTeacherTalk(action.DefName)) && !person.IsStudent)
+        {
+            return false;
+        }
+
        var max = TalkCircles.MaxSize(action.DefName, rules, person.Traits, school.Catalog);
        if (circle.Members.Count >= max || circle.Members.Contains(personId))
        {
@@ -238,7 +261,7 @@ internal static class TalkCircleSystem
                && circle.RemainingMinutes > 0)
            {
                var rules = school.Catalog!.BehaviorRules;
-                var max = rules?.TalkCircleMax ?? 4;
+                var max = TalkCircles.MaxSize(actionId, rules, [], school.Catalog);
                if (circle.Members.Count < max)
                {
                    return circle;
@@ -253,7 +276,8 @@ internal static class TalkCircleSystem
        School school,
        string exceptId,
        string nodeId,
-        bool requirePhone)
+        bool requirePhone,
+        bool studentsOnly = false)
    {
        var roster = school.Roster!.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
        var list = new List<TalkCircles.Candidate>();
@@ -268,6 +292,11 @@ internal static class TalkCircleSystem
                    return;
                }

+                if (studentsOnly && !roles.IsStudent)
+                {
+                    return;
+                }
+
                if (!roster.TryGetValue(identity.Id, out var person))
                {
                    return;
@@ -296,6 +325,14 @@ internal static class TalkCircleSystem
        {
            school.TalkCircleByPerson[member] = circle.Id;
            SetActivity(school, member, action.DefName, circle.TopicId, circle.RemainingMinutes);
+            if (TalkActions.IsWhisper(action.DefName))
+            {
+                school.AppendDayLog(new PersonLogEvent(
+                    member,
+                    school.Clock.Time,
+                    PersonLogTypes.Whispered,
+                    circle.TopicId));
+            }
        }
    }

@@ -392,6 +429,11 @@ internal static class TalkCircleSystem
                    appearance,
                    rules,
                    catalog);
+                if (person.IsStudent && other.IsStaff)
+                {
+                    delta = TalkCircles.ScaleByPedagogy(delta, SkillOf(school, other.Id, "Pedagogy"), rules);
+                }
+
                if (delta == 0)
                {
                    continue;
@@ -417,6 +459,150 @@ internal static class TalkCircleSystem
        school.TalkCirclesById.Remove(circle.Id);
    }

+    private static bool TryCatchWhisper(School school, ActiveTalkCircle circle)
+    {
+        if (circle.CatchChecked)
+        {
+            return false;
+        }
+
+        var teacherId = StaffStandingIn(school, circle.NodeId);
+        if (teacherId is null)
+        {
+            return false;
+        }
+
+        circle.CatchChecked = true;
+        var rules = school.Catalog!.BehaviorRules;
+        var traits = new List<string>();
+        foreach (var memberId in circle.Members)
+        {
+            var member = school.Roster!.People.FirstOrDefault(person => person.Id.Equals(memberId, StringComparison.Ordinal));
+            if (member is not null)
+            {
+                traits.AddRange(member.Traits);
+            }
+        }
+
+        var roll = TalkCircles.Roll01(
+            Seed.Mix(school.PeopleSeed, circle.Id, DateOnly.FromDateTime(school.Clock.Time).DayNumber, Seed.WhisperSalt));
+        var multiplier = TalkCircles.WhisperCatchMultiplier(traits, school.Catalog);
+        if (!TalkCircles.WhisperCaught(
+                roll,
+                rules?.WhisperCatchChance ?? 0.4f,
+                rules?.WhisperCatchMax ?? 0.85f,
+                multiplier))
+        {
+            return false;
+        }
+
+        ConvertToReprimand(school, circle, teacherId);
+        return true;
+    }
+
+    private static void ConvertToReprimand(School school, ActiveTalkCircle circle, string teacherId)
+    {
+        var pupils = circle.Members.ToArray();
+        foreach (var member in pupils)
+        {
+            school.AppendDayLog(new PersonLogEvent(
+                member,
+                school.Clock.Time,
+                PersonLogTypes.TeacherInterrupted,
+                circle.TopicId));
+            school.TalkCircleByPerson.Remove(member);
+            ClearActivity(school, member);
+        }
+
+        school.TalkCirclesById.Remove(circle.Id);
+        if (!school.Catalog!.Actions.TryGetValue(TalkActions.TeacherTalk, out var action))
+        {
+            return;
+        }
+
+        var members = new List<string> { teacherId };
+        var max = TalkCircles.MaxSize(TalkActions.TeacherTalk, school.Catalog.BehaviorRules, [], school.Catalog);
+        foreach (var id in pupils.OrderBy(value => value, StringComparer.Ordinal))
+        {
+            if (members.Count >= max)
+            {
+                break;
+            }
+
+            if (!members.Contains(id, StringComparer.Ordinal))
+            {
+                members.Add(id);
+            }
+        }
+
+        if (members.Count < 3)
+        {
+            return;
+        }
+
+        var reprimand = new ActiveTalkCircle
+        {
+            Id = $"reprimand-{teacherId}-{circle.NodeId}-{school.Clock.Time.Ticks}",
+            ActionId = TalkActions.TeacherTalk,
+            TopicId = TeacherTopics.Discipline,
+            NodeId = circle.NodeId,
+            Members = members,
+            RemainingMinutes = action.Minutes,
+            CatchChecked = true,
+        };
+        Register(school, reprimand, action);
+    }
+
+    private static string? StaffStandingIn(School school, string nodeId)
+    {
+        string? found = null;
+        school.World.Query(
+            in People,
+            (ref PersonIdentity identity, ref PersonRoles roles, ref Presence presence, ref PersonActivity activity) =>
+            {
+                if (found is not null
+                    || !roles.IsStaff
+                    || presence.NodeId is null
+                    || !presence.NodeId.Equals(nodeId, StringComparison.Ordinal)
+                    || presence.Path.Length > 0
+                    || presence.RemainingMinutes > 0)
+                {
+                    return;
+                }
+
+                found = identity.Id;
+            });
+        return found;
+    }
+
+    private static bool RoleFits(ActionDef action, Person person)
+    {
+        if (action.Roles.Count == 0)
+        {
+            return true;
+        }
+
+        foreach (var role in action.Roles)
+        {
+            if (role.Equals(HSchool.Content.PersonRoles.Student, StringComparison.OrdinalIgnoreCase) && person.IsStudent)
+            {
+                return true;
+            }
+
+            if (role.Equals(HSchool.Content.PersonRoles.Staff, StringComparison.OrdinalIgnoreCase) && person.IsStaff)
+            {
+                return true;
+            }
+
+            if (role.Equals(HSchool.Content.PersonRoles.Parent, StringComparison.OrdinalIgnoreCase) && person.IsParent)
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
    private static ApparelIssue AppearanceOf(School school, Person person)
    {
        var schoolClass = person.ClassId is { } classId
@@ -0,0 +1,178 @@
+using HSchool.Content;
+using HSchool.People;
+
+namespace HSchool.Ai.Tests;
+
+public class WhisperTests
+{
+    [Fact]
+    public void BlocksOnLesson_AllowsWhisper_NotChat()
+    {
+        Assert.True(TalkCircles.BlocksOnLesson(TalkActions.Chat));
+        Assert.True(TalkCircles.BlocksOnLesson(TalkActions.StaffChat));
+        Assert.True(TalkCircles.BlocksOnLesson(TalkActions.PhoneChat));
+        Assert.True(TalkCircles.BlocksOnLesson(TalkActions.TeacherTalk));
+        Assert.False(TalkCircles.BlocksOnLesson(TalkActions.Whisper));
+    }
+
+    [Fact]
+    public void FixedSeed_DoesNotCatchEveryWhisperWithTeacherChance()
+    {
+        var (catalog, _, _) = World();
+        var rules = catalog.BehaviorRules!;
+        var caught = 0;
+        const int attempts = 40;
+        for (var i = 0; i < attempts; i++)
+        {
+            var roll = TalkCircles.Roll01(Seed.Mix(1, i, Seed.WhisperSalt));
+            if (TalkCircles.WhisperCaught(roll, rules.WhisperCatchChance, rules.WhisperCatchMax, 1f))
+            {
+                caught++;
+            }
+        }
+
+        Assert.True(caught > 0);
+        Assert.True(caught < attempts);
+        Assert.True(rules.WhisperCatchMax < 1f);
+    }
+
+    [Fact]
+    public void CatchChance_NeverReachesOne_EvenWithLoudTraits()
+    {
+        var (catalog, _, _) = World();
+        var multiplier = TalkCircles.WhisperCatchMultiplier(["Outgoing", "Leader"], catalog);
+        Assert.True(multiplier > 1f);
+        var rules = catalog.BehaviorRules!;
+        const int attempts = 80;
+        var missed = 0;
+        for (var i = 0; i < attempts; i++)
+        {
+            var roll = TalkCircles.Roll01(Seed.Mix(2, i, Seed.WhisperSalt));
+            if (!TalkCircles.WhisperCaught(roll, rules.WhisperCatchChance, rules.WhisperCatchMax, multiplier))
+            {
+                missed++;
+            }
+        }
+
+        Assert.True(missed > 0);
+    }
+
+    [Fact]
+    public void HighPedagogy_AfterPraise_PlusesOpinionMoreThanLow()
+    {
+        var (catalog, _, _) = World();
+        var rules = catalog.BehaviorRules!;
+        var topic = catalog.Topics[TeacherTopics.Praise];
+        var from = Person("pupil", ["RussianLanguage"]);
+        var to = Person("teacher", ["RussianLanguage"]);
+        var raw = TalkCircles.OpinionDelta(
+            from,
+            to,
+            topic,
+            50f,
+            sharedLanguage: true,
+            TalkActions.TeacherTalk,
+            ApparelIssue.None,
+            rules,
+            catalog);
+
+        Assert.True(raw > 0);
+        var high = TalkCircles.ScaleByPedagogy(raw, 90f, rules);
+        var low = TalkCircles.ScaleByPedagogy(raw, 20f, rules);
+        Assert.True(high > low);
+    }
+
+    [Fact]
+    public void BoundToLesson_SocialZero_StartsWhisperNotChat()
+    {
+        var (catalog, map, walks) = World();
+        var classroom = map.Rooms.First(room => room.Def == "Classroom").Id;
+        var decision = DecisionPlanner.Decide(
+            catalog,
+            map,
+            walks,
+            new ActorState(
+                classroom,
+                classroom,
+                false,
+                false,
+                true,
+                false,
+                false,
+                true,
+                classroom,
+                Needs(social: 0f),
+                Intent.None,
+                Talk: new TalkPlannerContext(
+                    "p1",
+                    new Dictionary<string, int>(),
+                    new Dictionary<string, string>(),
+                    "c1",
+                    false,
+                    false,
+                    catalog.BehaviorRules)),
+            (_, _) => 0);
+
+        Assert.Equal(TalkActions.Whisper, decision.StartAction);
+        Assert.NotEqual(TalkActions.Chat, decision.StartAction);
+    }
+
+    [Fact]
+    public void PickTopic_OnLesson_OnlyWhisperTopics()
+    {
+        var (catalog, _, _) = World();
+        var picker = Person("a", ["RussianLanguage"]);
+        for (var seed = 0; seed < 30; seed++)
+        {
+            var id = TalkCircles.PickTopic(catalog, picker, age: 14, seed, whisperOnLesson: true);
+            Assert.NotNull(id);
+            Assert.True(catalog.Topics[id!].WhisperOnLesson);
+        }
+    }
+
+    private static Dictionary<string, float> Needs(float social = 1f) => new(StringComparer.Ordinal)
+    {
+        ["Social"] = social,
+        ["Hunger"] = 1f,
+        ["Sleep"] = 1f,
+        ["Toilet"] = 1f,
+    };
+
+    private static (DefCatalog Catalog, MapLayout Map, WalkGraph Walks) World()
+    {
+        var (catalog, map) = Fixtures.Vanilla();
+        return (catalog, map, WalkGraph.Build(catalog, map));
+    }
+
+    private static Person Person(string id, string[] languages)
+    {
+        var skills = languages.ToDictionary(skill => skill, _ => 60, StringComparer.Ordinal);
+        skills["Communication"] = 50;
+        var cases = new CaseTable
+        {
+            Nom = "A",
+            Gen = "A",
+            Dat = "A",
+            Acc = "A",
+            Ins = "A",
+            Pre = "A",
+        };
+        return new Person
+        {
+            Id = id,
+            FamilyId = "f1",
+            Female = false,
+            BirthDate = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc),
+            Name = new PersonName("A", "B", "C", cases, cases, cases),
+            IsStudent = true,
+            IsStaff = false,
+            IsParent = false,
+            Numbers = new Dictionary<string, int>(StringComparer.Ordinal),
+            Choices = new Dictionary<string, string>(StringComparer.Ordinal),
+            Skills = skills,
+            Traits = [],
+            Needs = new Dictionary<string, float>(StringComparer.Ordinal),
+            Opinions = new Dictionary<string, int>(StringComparer.Ordinal),
+        };
+    }
+}
@@ -113,6 +113,8 @@ public class BehaviorDefTests
        Assert.NotNull(catalog.BehaviorRules);
        Assert.Equal(0, catalog.BehaviorRules.CommuteRainMinutes);
        Assert.Equal(0, catalog.BehaviorRules.CommuteSnowMinutes);
+        Assert.Equal(0.4f, catalog.BehaviorRules.LessonWhisperSkillFactor);
+        Assert.Equal(0.4f, catalog.BehaviorRules.WhisperCatchChance);
    }

    [Theory]
@@ -16,6 +16,10 @@ public class TopicDefTests
        Assert.True(catalog.Topics.Count >= 8);
        Assert.True(catalog.Topics.ContainsKey("TopicStudy"));
        Assert.Contains("study", catalog.Topics["TopicStudy"].Tags);
+        Assert.True(catalog.Topics["TopicGames"].WhisperOnLesson);
+        Assert.False(catalog.Topics["TopicRude"].WhisperOnLesson);
+        Assert.True(catalog.Topics.ContainsKey("TopicPraise"));
+        Assert.True(catalog.Topics.ContainsKey("TopicDiscipline"));
    }

    [Fact]
@@ -0,0 +1,301 @@
+using Arch.Core;
+using HSchool.Ai;
+using HSchool.Content;
+using HSchool.People;
+using HSchool.Schedule;
+
+namespace HSchool.Simulation.Tests;
+
+public class WhisperTests
+{
+    private static readonly DateTime TuesdayMorning = new(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);
+    private static readonly DateTime LessonStart = new(2012, 4, 3, 8, 30, 0, DateTimeKind.Utc);
+
+    [Fact]
+    public void WhisperOnLesson_GainsLessThanQuietLesson()
+    {
+        var (school, homeroom, firstId, secondId, teacherId) = TwoPupilsAndTeacher();
+        using (school)
+        {
+            AdvanceTo(school, LessonStart);
+            var schoolClass = school.Roster!.Classes.First(row => row.PupilIds.Contains(firstId));
+            foreach (var id in schoolClass.PupilIds)
+            {
+                PlaceAt(school, id, id == firstId || id == secondId ? homeroom : "corridor-1");
+            }
+
+            PlaceAt(school, firstId, homeroom);
+            PlaceAt(school, secondId, homeroom);
+            PlaceAt(school, teacherId, homeroom);
+            PlaceTextbook(school, firstId, "Mathematics");
+            PlaceTextbook(school, secondId, "Mathematics");
+            Assert.True(school.TryStartAction(firstId, TalkActions.Whisper));
+            Assert.Equal(TalkActions.Whisper, ActivityOf(school, firstId));
+            Assert.Equal(TalkActions.Whisper, ActivityOf(school, secondId));
+
+            var whisperBefore = SkillOf(school, firstId, "Mathematics");
+            var quietId = schoolClass.PupilIds.First(id => id != firstId && id != secondId);
+            PlaceAt(school, quietId, homeroom);
+            PlaceTextbook(school, quietId, "Mathematics");
+            var quietBefore = SkillOf(school, quietId, "Mathematics");
+
+            LessonLearningSystem.Apply(school, 45);
+
+            var whisperGain = SkillOf(school, firstId, "Mathematics") - whisperBefore;
+            var quietGain = SkillOf(school, quietId, "Mathematics") - quietBefore;
+            Assert.True(quietGain > 0);
+            Assert.True(whisperGain > 0);
+            Assert.True(quietGain > whisperGain);
+        }
+    }
+
+    [Fact]
+    public void WithoutTeacherInNode_WhisperIsNotCaught()
+    {
+        var (school, homeroom, firstId, secondId, teacherId) = TwoPupilsAndTeacher();
+        using (school)
+        {
+            AdvanceTo(school, LessonStart);
+            var schoolClass = school.Roster!.Classes.First(row => row.PupilIds.Contains(firstId));
+            foreach (var id in schoolClass.PupilIds)
+            {
+                PlaceAt(school, id, id == firstId || id == secondId ? homeroom : "corridor-1");
+            }
+
+            PlaceAt(school, firstId, homeroom);
+            PlaceAt(school, secondId, homeroom);
+            PlaceAt(school, teacherId, "restroom-1");
+            Assert.True(school.TryStartAction(firstId, TalkActions.Whisper));
+
+            TalkCircleSystem.Apply(school, 0.5d);
+
+            Assert.Equal(TalkActions.Whisper, ActivityOf(school, firstId));
+            Assert.DoesNotContain(
+                school.DayLog,
+                row => (row.PersonId == firstId || row.PersonId == secondId)
+                    && row.Type.Equals(PersonLogTypes.TeacherInterrupted, StringComparison.Ordinal)
+                    && row.Time == school.Clock.Time);
+            Assert.Contains(
+                school.DayLog,
+                row => row.PersonId == firstId
+                    && row.Type.Equals(PersonLogTypes.Whispered, StringComparison.Ordinal)
+                    && row.Time == school.Clock.Time);
+            Assert.Equal(
+                "шептались",
+                school.DayLog.Last(row => row.Type == PersonLogTypes.Whispered).Caption(school.Catalog!, "ru"));
+        }
+    }
+
+    [Fact]
+    public void FixedSeed_WithTeacherInRoom_DoesNotCatchEveryWhisper()
+    {
+        var (school, homeroom, firstId, secondId, teacherId) = TwoPupilsAndTeacher();
+        using (school)
+        {
+            AdvanceTo(school, LessonStart);
+            var caught = 0;
+            var missed = 0;
+            for (var i = 0; i < 24; i++)
+            {
+                school.Clock.JumpTo(LessonStart.AddMinutes(i));
+                TalkCircleSystem.Interrupt(school, firstId);
+                TalkCircleSystem.Interrupt(school, secondId);
+                TalkCircleSystem.Interrupt(school, teacherId);
+                var schoolClass = school.Roster!.Classes.First(row => row.PupilIds.Contains(firstId));
+                foreach (var id in schoolClass.PupilIds)
+                {
+                    PlaceAt(school, id, id == firstId || id == secondId ? homeroom : "corridor-1");
+                }
+
+                PlaceAt(school, firstId, homeroom);
+                PlaceAt(school, secondId, homeroom);
+                PlaceAt(school, teacherId, homeroom);
+                Assert.True(school.TryStartAction(firstId, TalkActions.Whisper));
+                TalkCircleSystem.Apply(school, 0.2d);
+                if (school.DayLog.Any(row =>
+                        (row.PersonId == firstId || row.PersonId == secondId)
+                        && row.Type.Equals(PersonLogTypes.TeacherInterrupted, StringComparison.Ordinal)
+                        && row.Time == school.Clock.Time))
+                {
+                    caught++;
+                    Assert.Equal(
+                        "учитель оборвал",
+                        school.DayLog.Last(row => row.Type == PersonLogTypes.TeacherInterrupted).Caption(school.Catalog!, "ru"));
+                }
+                else
+                {
+                    missed++;
+                    Assert.Equal(TalkActions.Whisper, ActivityOf(school, firstId));
+                }
+            }
+
+            Assert.True(caught > 0);
+            Assert.True(missed > 0);
+        }
+    }
+
+    [Fact]
+    public void OrdinaryChat_DoesNotStartOnLesson()
+    {
+        var (school, homeroom, firstId, secondId, teacherId) = TwoPupilsAndTeacher();
+        using (school)
+        {
+            AdvanceTo(school, LessonStart);
+            var schoolClass = school.Roster!.Classes.First(row => row.PupilIds.Contains(firstId));
+            foreach (var id in schoolClass.PupilIds)
+            {
+                PlaceAt(school, id, id == firstId || id == secondId ? homeroom : "corridor-1");
+            }
+
+            PlaceAt(school, firstId, homeroom);
+            PlaceAt(school, secondId, homeroom);
+            PlaceAt(school, teacherId, homeroom);
+
+            Assert.False(school.TryStartAction(firstId, TalkActions.Chat));
+            Assert.Null(ActivityOf(school, firstId));
+            Assert.True(school.TryStartAction(firstId, TalkActions.Whisper));
+        }
+    }
+
+    [Fact]
+    public void TeacherAfterLesson_TakesTwoToFourPupils()
+    {
+        var (school, homeroom, firstId, secondId, teacherId) = TwoPupilsAndTeacher();
+        using (school)
+        {
+            var schoolClass = school.Roster!.Classes.First(row => row.PupilIds.Contains(firstId));
+            var thirdId = schoolClass.PupilIds.First(id => id != firstId && id != secondId);
+            AdvanceTo(school, new DateTime(2012, 4, 3, 9, 16, 0, DateTimeKind.Utc));
+            foreach (var id in schoolClass.PupilIds)
+            {
+                PlaceAt(school, id, id == firstId || id == secondId || id == thirdId ? homeroom : "corridor-1");
+            }
+
+            PlaceAt(school, firstId, homeroom);
+            PlaceAt(school, secondId, homeroom);
+            PlaceAt(school, thirdId, homeroom);
+            PlaceAt(school, teacherId, homeroom);
+
+            Assert.True(school.TryStartAction(teacherId, TalkActions.TeacherTalk));
+            var members = new[] { firstId, secondId, thirdId, teacherId }
+                .Count(id => ActivityOf(school, id) == TalkActions.TeacherTalk);
+            Assert.InRange(members, 3, 5);
+            var pupils = new[] { firstId, secondId, thirdId }
+                .Count(id => ActivityOf(school, id) == TalkActions.TeacherTalk);
+            Assert.InRange(pupils, 2, 4);
+        }
+    }
+
+    private static (School School, string Homeroom, string FirstId, string SecondId, string TeacherId) TwoPupilsAndTeacher()
+    {
+        var (catalog, map) = Vanilla();
+        var roster = RosterGenerator.Generate(catalog, map, schoolSeed: 1, "Russia", TuesdayMorning);
+        var pool = ApplicantPool.Create(catalog, roster, schoolSeed: 1, "Russia", TuesdayMorning);
+        var hired = Staffing.Hire(catalog, map, roster, pool, pool.Applicants[0].Person.Id, Staffing.TeacherPosition, 1_000_000f);
+        Assert.Equal(StaffingError.None, hired.Error);
+        roster = hired.Roster;
+        pool = hired.Pool;
+        var hiredId = roster.People.First(person => person.IsStaff).Id;
+        var schoolClass = roster.Classes.First(row =>
+            row.RoomId is "classroom-101" or "classroom-102" or "classroom-103" or "classroom-104");
+        var school = School.Create(1, "Шёпот", TuesdayMorning, catalog, map);
+        school.InstallPeople(roster, seed: 1, "Russia", pool);
+        school.SetTimetable(new Timetable(
+            [new LessonPlacement(schoolClass.Id, "Mathematics", hiredId, schoolClass.RoomId, Day: 1, Period: 1)],
+            []));
+        school.ConfigurePresence(weekDays: 5, maxDecisionsPerTick: 10_000);
+        var pupils = schoolClass.PupilIds
+            .Select(id => school.Roster!.People.First(person => person.Id == id))
+            .Take(2)
+            .ToArray();
+        return (school, schoolClass.RoomId, pupils[0].Id, pupils[1].Id, hiredId);
+    }
+
+    private static void PlaceTextbook(School school, string personId, string subject)
+    {
+        var person = school.Roster!.People.First(row => row.Id.Equals(personId, StringComparison.Ordinal));
+        if (person.Items is not IList<InventoryItem> items || items.IsReadOnly)
+        {
+            throw new InvalidOperationException($"Cannot mutate items for {personId}.");
+        }
+
+        for (var i = items.Count - 1; i >= 0; i--)
+        {
+            if (items[i].Subject is not null)
+            {
+                items.RemoveAt(i);
+            }
+        }
+
+        items.Add(new InventoryItem("Textbook", Color: null, Condition: 1f, ItemLocations.Bag, subject));
+    }
+
+    private static void AdvanceTo(School school, DateTime until)
+    {
+        while (school.Clock.Time < until)
+        {
+            school.Tick(0.2d, 5d);
+        }
+    }
+
+    private static void PlaceAt(School school, string personId, string nodeId)
+    {
+        TalkCircleSystem.Interrupt(school, personId);
+        school.TalkCircleByPerson.Remove(personId);
+        var query = new QueryDescription().WithAll<PersonIdentity, Presence, PersonActivity, Intent>();
+        school.World.Query(
+            in query,
+            (ref PersonIdentity identity, ref Presence presence, ref PersonActivity activity, ref Intent intent) =>
+            {
+                if (identity.Id.Equals(personId, StringComparison.Ordinal))
+                {
+                    presence = new Presence(nodeId, 0f, nodeId, false, []);
+                    activity = PersonActivity.Idle;
+                    intent = Intent.None;
+                }
+            });
+    }
+
+    private static string? ActivityOf(School school, string personId) =>
+        school.CapturePresence().Single(row => row.PersonId == personId).ActionId;
+
+    private static float SkillOf(School school, string personId, string skill)
+    {
+        var value = float.NaN;
+        var query = new QueryDescription().WithAll<PersonIdentity, PersonSkills>();
+        school.World.Query(
+            in query,
+            (ref PersonIdentity identity, ref PersonSkills skills) =>
+            {
+                if (identity.Id.Equals(personId, StringComparison.Ordinal))
+                {
+                    value = skills.Values.GetValueOrDefault(skill);
+                }
+            });
+        return value;
+    }
+
+    private static (DefCatalog Catalog, MapLayout Map) Vanilla()
+    {
+        var root = Path.Combine(AppContext.BaseDirectory, "vanilla");
+        var documents = new List<ContentDocument>();
+        foreach (var path in Directory.EnumerateFiles(root, "*.*", SearchOption.AllDirectories))
+        {
+            if (!path.EndsWith(".jsonc", StringComparison.OrdinalIgnoreCase)
+                && !path.EndsWith(".json", StringComparison.OrdinalIgnoreCase))
+            {
+                continue;
+            }
+
+            documents.Add(new ContentDocument(
+                CatalogLoader.CorePackId,
+                Path.GetRelativePath(root, path).Replace('\\', '/'),
+                File.ReadAllText(path)));
+        }
+
+        var catalog = new CatalogLoader().Load([CatalogLoader.CorePackId], documents);
+        var map = CatalogLoader.LastDefaultMap([CatalogLoader.CorePackId], documents);
+        Assert.NotNull(map);
+        return (catalog, map);
+    }
+}