diff --git a/packages/client-runtime/src/state/threadReducer.test.ts b/packages/client-runtime/src/state/threadReducer.test.ts
index 8db2938b4720..707b3c75189a 100644
--- a/packages/client-runtime/src/state/threadReducer.test.ts
+++ b/packages/client-runtime/src/state/threadReducer.test.ts
@@ -1017,6 +1017,81 @@ describe("applyThreadDetailEvent", () => {
         ]);
       }
     });
+
+    it("excludes the retracted message from a paginated thread window", () => {
+      const paginatedThread: OrchestrationThread = {
+        ...baseThread,
+        messages: [
+          {
+            id: MessageId.make("msg-user-loaded"),
+            role: "user",
+            text: "Loaded history",
+            turnId: null,
+            streaming: false,
+            createdAt: "2026-04-01T01:00:00.000Z",
+            updatedAt: "2026-04-01T01:00:00.000Z",
+          },
+          {
+            id: MessageId.make("msg-assistant-loaded"),
+            role: "assistant",
+            text: "Loaded response",
+            turnId: TurnId.make("turn-287"),
+            streaming: false,
+            createdAt: "2026-04-01T02:00:00.000Z",
+            updatedAt: "2026-04-01T02:00:00.000Z",
+          },
+          {
+            id: MessageId.make("msg-user-retracted"),
+            role: "user",
+            text: "Retract me",
+            turnId: null,
+            streaming: false,
+            createdAt: "2026-04-01T03:00:00.000Z",
+            updatedAt: "2026-04-01T03:00:00.000Z",
+          },
+        ],
+        checkpoints: [
+          {
+            turnId: TurnId.make("turn-287"),
+            checkpointTurnCount: 287,
+            checkpointRef: CheckpointRef.make("ref-287"),
+            status: "ready",
+            files: [],
+            assistantMessageId: MessageId.make("msg-assistant-loaded"),
+            completedAt: "2026-04-01T02:00:00.000Z",
+          },
+        ],
+      };
+      const completedAt = "2026-04-01T04:00:00.000Z";
+
+      const result = applyThreadDetailEvent(paginatedThread, {
+        ...baseEventFields,
+        sequence: 16,
+        occurredAt: completedAt,
+        aggregateKind: "thread",
+        aggregateId: ThreadId.make("thread-1"),
+        type: "thread.reverted",
+        payload: {
+          threadId: ThreadId.make("thread-1"),
+          turnCount: 287,
+          retraction: {
+            requestId: CommandId.make("cmd-retract-paginated"),
+            messageId: MessageId.make("msg-user-retracted"),
+            turnId: null,
+            firstUserMessage: false,
+            completedAt,
+          },
+        },
+      });
+
+      expect(result.kind).toBe("updated");
+      if (result.kind === "updated") {
+        expect(result.thread.messages.map((message) => message.id)).toEqual([
+          "msg-user-loaded",
+          "msg-assistant-loaded",
+        ]);
+      }
+    });
   });
 
   describe("retraction projection", () => {
diff --git a/packages/client-runtime/src/state/threadReducer.ts b/packages/client-runtime/src/state/threadReducer.ts
index 6a38b231596d..0363bcacaa25 100644
--- a/packages/client-runtime/src/state/threadReducer.ts
+++ b/packages/client-runtime/src/state/threadReducer.ts
@@ -570,10 +570,15 @@ export function applyThreadDetailEvent(
       );
 
       const retainedTurnIds = new Set(Arr.map(checkpoints, (entry) => entry.turnId));
+      const excludedMessageIds =
+        event.payload.retraction === undefined
+          ? new Set<string>()
+          : new Set([event.payload.retraction.messageId]);
       const messages = retainMessagesAfterRevert(
         thread.messages,
         retainedTurnIds,
         event.payload.turnCount,
+        excludedMessageIds,
       );
       const proposedPlans = pipe(
         thread.proposedPlans,
@@ -754,9 +759,13 @@ function retainMessagesAfterRevert(
   messages: ReadonlyArray<OrchestrationMessage>,
   retainedTurnIds: ReadonlySet<string>,
   turnCount: number,
+  excludedMessageIds: ReadonlySet<string>,
 ): OrchestrationMessage[] {
   const retainedMessageIds = new Set<string>();
   for (const message of messages) {
+    if (excludedMessageIds.has(message.id)) {
+      continue;
+    }
     if (message.role === "system") {
       retainedMessageIds.add(message.id);
       continue;
@@ -774,6 +783,7 @@ function retainMessagesAfterRevert(
     .filter(
       (message) =>
         message.role === "user" &&
+        !excludedMessageIds.has(message.id) &&
         !retainedMessageIds.has(message.id) &&
         (message.turnId === null || retainedTurnIds.has(message.turnId)),
     )
@@ -794,6 +804,7 @@ function retainMessagesAfterRevert(
     .filter(
       (message) =>
         message.role === "assistant" &&
+        !excludedMessageIds.has(message.id) &&
         !retainedMessageIds.has(message.id) &&
         (message.turnId === null || retainedTurnIds.has(message.turnId)),
     )