diff --git a/index.js b/index.js
index 578a04f..faf7821 100644
--- a/index.js
+++ b/index.js
@@ -162,6 +162,7 @@ import {
 } from "./runtime/reroll-transaction-boundary.js";
 import { createRecallInputState } from "./runtime/recall-input-state.js";
 import { createRerollRecallInput } from "./runtime/reroll-recall-input.js";
+import { createGenerationContextTracker } from "./runtime/generation-context.js";
 import { createGenerationRecallTransactions } from "./runtime/generation-recall-transactions.js";
 import { createFinalRecallInjection } from "./runtime/final-recall-injection.js";
 import { createAutoExtractionDefer } from "./runtime/auto-extraction-defer.js";
@@ -1739,6 +1740,10 @@ const generationRecallTransactionRuntime = createGenerationRecallTransactions({
 });
 const generationRecallTransactions =
   generationRecallTransactionRuntime.generationRecallTransactions;
+const generationContextTracker = createGenerationContextTracker({
+  getCurrentChatId,
+  ttlMs: GENERATION_RECALL_TRANSACTION_TTL_MS,
+});
 const finalRecallInjectionRuntime = createFinalRecallInjection({
   applyModuleInjectionPrompt: (...args) => applyModuleInjectionPrompt(...args),
   areRecallNodeIdListsEqual: (...args) => areRecallNodeIdListsEqual(...args),
@@ -15860,6 +15865,7 @@ async function runRecall(options = {}) {
 function onChatChanged() {
   isHostGenerationRunning = false;
   lastHostGenerationEndedAt = 0;
+  generationContextTracker.clear("chat-changed");
   const { target, lightweightHostMode, adapter } = syncBmeHostRuntimeFlags(getContext());
   updateGraphPersistenceState({
     hostProfile: adapter.hostProfile,
@@ -16042,6 +16048,7 @@ function onMessageUpdated(messageId, meta = null) {
 }
 
 async function onMessageSwiped(messageId, meta = null) {
+  generationContextTracker.noteSwipe(messageId, meta);
   const result = await onMessageSwipedController(
     {
       invalidateRecallAfterHistoryMutation,
@@ -16155,6 +16162,10 @@ function onGenerationBeforeApiRequest(payload = {}) {
 
 function onGenerationStarted(type, params = {}, dryRun = false) {
   const generationType = String(type || "normal").trim() || "normal";
+  generationContextTracker.begin(generationType, params, {
+    dryRun,
+    phase: "GENERATION_STARTED",
+  });
   if (
     !dryRun &&
     !params?.automatic_trigger &&
@@ -16218,9 +16229,14 @@ function onGenerationEnded(_chatLength = null) {
   if (typeof scheduleMessageHideApply === "function") {
     scheduleMessageHideApply("generation-ended", 180);
   }
+  generationContextTracker.clear("generation-ended");
 }
 
 async function onGenerationAfterCommands(type, params = {}, dryRun = false) {
+  generationContextTracker.update(type, params, {
+    dryRun,
+    phase: "GENERATION_AFTER_COMMANDS",
+  });
   return await onGenerationAfterCommandsController(
     {
       applyFinalRecallInjectionForGeneration,
diff --git a/package.json b/package.json
index 41f9414..1b99485 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "test:p0": "node tests/p0-regressions.mjs",
     "test:triviumdb-poc": "node tests/triviumdb-poc.mjs",
     "test:runtime-history": "node tests/runtime-history.mjs",
+    "test:generation-context": "node tests/generation-context.mjs",
     "test:graph-persistence": "node tests/graph-persistence.mjs",
     "test:index-slicing-ratchet": "node tests/index-slicing-ratchet.mjs",
     "test:runtime-deps": "node tests/runtime-deps-completeness.mjs",
diff --git a/runtime/generation-context.js b/runtime/generation-context.js
new file mode 100644
index 0000000..d55eaa3
--- /dev/null
+++ b/runtime/generation-context.js
@@ -0,0 +1,156 @@
+const DEFAULT_GENERATION_CONTEXT_TTL_MS = 60000;
+
+export function normalizeGenerationType(type = "normal") {
+  const normalized = String(type || "normal").trim();
+  return normalized || "normal";
+}
+
+export function classifyGenerationKind(type = "normal", params = {}) {
+  const generationType = normalizeGenerationType(type);
+  if (params?.automatic_trigger || params?.quiet_prompt) {
+    return "skip";
+  }
+  if (generationType === "quiet" || generationType === "impersonate") {
+    return "skip";
+  }
+  if (
+    generationType === "swipe" ||
+    generationType === "regenerate" ||
+    generationType === "continue"
+  ) {
+    return "no-new-user";
+  }
+  return "fresh";
+}
+
+function clonePlain(value, fallback = null) {
+  if (!value || typeof value !== "object") return fallback;
+  try {
+    return structuredClone(value);
+  } catch (_error) {
+    try {
+      return JSON.parse(JSON.stringify(value));
+    } catch (_jsonError) {
+      return fallback;
+    }
+  }
+}
+
+export function createGenerationContextTracker(deps = {}) {
+  let current = null;
+  let pendingSwipe = null;
+  let sequence = 0;
+
+  const now = () =>
+    typeof deps.now === "function" ? Number(deps.now()) || Date.now() : Date.now();
+  const ttlMs = () =>
+    Number.isFinite(Number(deps.ttlMs))
+      ? Math.max(1, Number(deps.ttlMs))
+      : DEFAULT_GENERATION_CONTEXT_TTL_MS;
+  const getChatId = () => String(deps.getCurrentChatId?.() || "").trim();
+
+  function noteSwipe(messageId = null, meta = null) {
+    const parsed = Number(messageId);
+    pendingSwipe = {
+      assistantFloor: Number.isFinite(parsed) ? Math.floor(parsed) : null,
+      meta: clonePlain(meta, null),
+      chatId: getChatId(),
+      at: now(),
+    };
+    return pendingSwipe;
+  }
+
+  function begin(type = "normal", params = {}, { dryRun = false, phase = "" } = {}) {
+    if (dryRun) return null;
+    const at = now();
+    const generationType = normalizeGenerationType(type);
+    const kind = classifyGenerationKind(generationType, params);
+    const context = {
+      id: `${at}:${++sequence}`,
+      type: generationType,
+      kind,
+      chatId: getChatId(),
+      params: clonePlain(params, {}),
+      dryRun: false,
+      startedAt: at,
+      updatedAt: at,
+      phase: String(phase || ""),
+      swipedAssistantFloor:
+        generationType === "swipe" && Number.isFinite(pendingSwipe?.assistantFloor)
+          ? pendingSwipe.assistantFloor
+          : null,
+      swipeMeta: generationType === "swipe" ? clonePlain(pendingSwipe?.meta, null) : null,
+      expectedMutation: "",
+      expectedMutationAt: 0,
+    };
+    pendingSwipe = null;
+    current = context;
+    return { ...context };
+  }
+
+  function update(type = "normal", params = {}, { dryRun = false, phase = "" } = {}) {
+    if (dryRun) return null;
+    const at = now();
+    const generationType = normalizeGenerationType(type);
+    const kind = classifyGenerationKind(generationType, params);
+    if (!current || current.type !== generationType || current.chatId !== getChatId()) {
+      return begin(generationType, params, { dryRun, phase });
+    }
+    current = {
+      ...current,
+      type: generationType,
+      kind,
+      params: clonePlain(params, current.params || {}),
+      updatedAt: at,
+      afterCommandsAt:
+        String(phase || "") === "GENERATION_AFTER_COMMANDS"
+          ? at
+          : current.afterCommandsAt || 0,
+      phase: String(phase || current.phase || ""),
+    };
+    return { ...current };
+  }
+
+  function get({ allowStale = false } = {}) {
+    if (!current) return null;
+    const age = now() - Number(current.updatedAt || current.startedAt || 0);
+    if (!allowStale && age > ttlMs()) {
+      current = null;
+      return null;
+    }
+    const activeChatId = getChatId();
+    if (current.chatId && activeChatId && current.chatId !== activeChatId) {
+      current = null;
+      return null;
+    }
+    return { ...current };
+  }
+
+  function markExpectedMutation(kind = "", payload = {}) {
+    if (!current) return null;
+    current = {
+      ...current,
+      expectedMutation: String(kind || ""),
+      expectedMutationAt: now(),
+      expectedMutationPayload: clonePlain(payload, {}),
+      updatedAt: now(),
+    };
+    return { ...current };
+  }
+
+  function clear(reason = "") {
+    const previous = current;
+    current = null;
+    pendingSwipe = null;
+    return previous ? { ...previous, clearReason: String(reason || "") } : null;
+  }
+
+  return {
+    begin,
+    update,
+    get,
+    clear,
+    noteSwipe,
+    markExpectedMutation,
+  };
+}
diff --git a/tests/generation-context.mjs b/tests/generation-context.mjs
new file mode 100644
index 0000000..7f1d3ad
--- /dev/null
+++ b/tests/generation-context.mjs
@@ -0,0 +1,102 @@
+import assert from "node:assert/strict";
+import {
+  classifyGenerationKind,
+  createGenerationContextTracker,
+} from "../runtime/generation-context.js";
+
+assert.equal(classifyGenerationKind("normal"), "fresh");
+assert.equal(classifyGenerationKind("swipe"), "no-new-user");
+assert.equal(classifyGenerationKind("regenerate"), "no-new-user");
+assert.equal(classifyGenerationKind("continue"), "no-new-user");
+assert.equal(classifyGenerationKind("quiet"), "skip");
+assert.equal(classifyGenerationKind("impersonate"), "skip");
+assert.equal(classifyGenerationKind("normal", { automatic_trigger: true }), "skip");
+assert.equal(classifyGenerationKind("normal", { quiet_prompt: true }), "skip");
+
+{
+  let chatId = "chat-swipe";
+  let now = 1000;
+  const tracker = createGenerationContextTracker({
+    getCurrentChatId: () => chatId,
+    now: () => now,
+  });
+
+  tracker.noteSwipe(7);
+  const context = tracker.begin("swipe");
+
+  assert.equal(context.type, "swipe");
+  assert.equal(context.kind, "no-new-user");
+  assert.equal(context.swipedAssistantFloor, 7);
+  assert.equal(context.chatId, chatId);
+}
+
+{
+  let chatId = "chat-dry-run";
+  let now = 2000;
+  const tracker = createGenerationContextTracker({
+    getCurrentChatId: () => chatId,
+    now: () => now,
+  });
+
+  const original = tracker.begin("normal", { existing: true });
+  assert.equal(tracker.begin("swipe", {}, { dryRun: true }), null);
+  assert.deepEqual(tracker.get(), original);
+
+  now += 1;
+  assert.equal(tracker.update("regenerate", {}, { dryRun: true }), null);
+  assert.deepEqual(tracker.get(), original);
+}
+
+{
+  let chatId = "chat-update";
+  let now = 3000;
+  const tracker = createGenerationContextTracker({
+    getCurrentChatId: () => chatId,
+    now: () => now,
+  });
+
+  tracker.begin("regenerate");
+  now += 25;
+  const context = tracker.update(
+    "regenerate",
+    {},
+    { phase: "GENERATION_AFTER_COMMANDS" },
+  );
+
+  assert.equal(context.type, "regenerate");
+  assert.equal(context.kind, "no-new-user");
+  assert.equal(context.afterCommandsAt, now);
+}
+
+{
+  let chatId = "chat-ttl";
+  let now = 4000;
+  const tracker = createGenerationContextTracker({
+    getCurrentChatId: () => chatId,
+    now: () => now,
+    ttlMs: 10,
+  });
+
+  tracker.begin("normal");
+  now += 11;
+
+  assert.equal(tracker.get(), null);
+  assert.equal(tracker.get({ allowStale: true }), null);
+}
+
+{
+  let chatId = "chat-original";
+  let now = 5000;
+  const tracker = createGenerationContextTracker({
+    getCurrentChatId: () => chatId,
+    now: () => now,
+  });
+
+  tracker.begin("normal");
+  chatId = "chat-current";
+
+  assert.equal(tracker.get(), null);
+
+  chatId = "chat-original";
+  assert.equal(tracker.get(), null);
+}