diff --git a/packages/agent-core-v2/src/agent/contextOps/contextOps.ts b/packages/agent-core-v2/src/agent/contextOps/contextOps.ts
index dae051989..98bf8d0d7 100644
--- a/packages/agent-core-v2/src/agent/contextOps/contextOps.ts
+++ b/packages/agent-core-v2/src/agent/contextOps/contextOps.ts
@@ -16,7 +16,7 @@ import { createDecorator } from "#/_base/di";
 import type { ContextMessage, PromptOrigin } from '#/agent/contextMemory';
 
 export type ContextAppendArgs = readonly ContextMessage[];
-export type ContextAppendSystemReminderArgs = [message: ContextMessage];
+export type ContextAppendSystemReminderArgs = [message: string, origin: PromptOrigin];
 export type ContextReplaceArgs = [index: number, message: ContextMessage];
 
 /**
@@ -41,7 +41,7 @@ export interface IAgentContextOpsService {
 
   /**
    * Append a `<system-reminder>` message to the end of the history.
-   * Returns the raw message recorded by the wire operation.
+   * Returns the message inserted into history.
    */
   appendSystemReminder(content: string, origin: PromptOrigin): ContextMessage;
 
diff --git a/packages/agent-core-v2/src/agent/contextOps/contextOpsService.ts b/packages/agent-core-v2/src/agent/contextOps/contextOpsService.ts
index ad534ba22..b40adb4ee 100644
--- a/packages/agent-core-v2/src/agent/contextOps/contextOpsService.ts
+++ b/packages/agent-core-v2/src/agent/contextOps/contextOpsService.ts
@@ -6,9 +6,9 @@
  * (Infinity start) and mirror each message into the replay read model;
  * `remove` splices out each resolved target and drops the matching replay
  * messages; `clear` drops the whole history and cuts a new replay segment;
- * legacy `replace` swaps one message in place for old migrated wire. Message
- * content is offloaded to the blob store through each operation's blob
- * selector. Bound at Agent scope.
+ * legacy `replace` swaps one message in place for old migrated wire. Structured
+ * message content is offloaded to the blob store through the operations that
+ * carry full messages. Bound at Agent scope.
  */
 
 import { Disposable } from "#/_base/di";
@@ -63,17 +63,6 @@ function messageContentBlobTarget<T extends readonly unknown[]>(
   };
 }
 
-function toSystemReminderMessage(message: ContextMessage): ContextMessage {
-  return {
-    ...message,
-    content: message.content.map((part) =>
-      part.type === 'text'
-        ? { ...part, text: toSystemReminderText(part.text) }
-        : part,
-    ),
-  };
-}
-
 function toSystemReminderText(content: string): string {
   const trimmed = content.trim();
   if (trimmed.startsWith('<system-reminder>') && trimmed.endsWith('</system-reminder>')) {
@@ -82,6 +71,20 @@ function toSystemReminderText(content: string): string {
   return `<system-reminder>\n${trimmed}\n</system-reminder>`;
 }
 
+function toSystemReminderMessage(content: string, origin: PromptOrigin): ContextMessage {
+  return ensureMessageId({
+    role: 'user',
+    content: [
+      {
+        type: 'text',
+        text: toSystemReminderText(content),
+      },
+    ],
+    toolCalls: [],
+    origin,
+  });
+}
+
 export class AgentContextOpsService extends Disposable implements IAgentContextOpsService {
   declare readonly _serviceBrand: undefined;
 
@@ -121,19 +124,15 @@ export class AgentContextOpsService extends Disposable implements IAgentContextO
     this.appendSystemReminderOperation =
       context.defineOperation<ContextAppendSystemReminderArgs>({
         type: 'append_system_reminder',
-        apply: (splice, message) => {
-          splice(Number.POSITIVE_INFINITY, 0, [toSystemReminderMessage(message)]);
+        apply: (splice, message, origin) => {
+          splice(Number.POSITIVE_INFINITY, 0, [toSystemReminderMessage(message, origin)]);
         },
-        replay: (replay, message) => {
-          replay.push({ type: 'message', message: toSystemReminderMessage(message) });
+        replay: (replay, message, origin) => {
+          replay.push({
+            type: 'message',
+            message: toSystemReminderMessage(message, origin),
+          });
         },
-        blobs: ([message]) => [
-          messageContentBlobTarget<ContextAppendSystemReminderArgs>(
-            message,
-            (_current, next) => [next],
-            ([current]) => current,
-          ),
-        ],
       });
 
     this.removeOperation = context.defineOperation<ContextRemoveArgs>({
@@ -187,19 +186,8 @@ export class AgentContextOpsService extends Disposable implements IAgentContextO
   }
 
   appendSystemReminder(content: string, origin: PromptOrigin): ContextMessage {
-    const message = ensureMessageId({
-      role: 'user',
-      content: [
-        {
-          type: 'text',
-          text: content.trim(),
-        },
-      ],
-      toolCalls: [],
-      origin,
-    });
-    this.appendSystemReminderOperation(message);
-    return message;
+    this.appendSystemReminderOperation(content.trim(), origin);
+    return this.context.get().at(-1)!;
   }
 
   remove(removals: readonly ContextRemovalTarget[]): void {
diff --git a/packages/agent-core-v2/test/wireRecord/persistence.test.ts b/packages/agent-core-v2/test/wireRecord/persistence.test.ts
index ca71d8008..d8845b934 100644
--- a/packages/agent-core-v2/test/wireRecord/persistence.test.ts
+++ b/packages/agent-core-v2/test/wireRecord/persistence.test.ts
@@ -310,6 +310,10 @@ describe('AgentWireRecordService persistence', () => {
     expect(context.get()[0]?.content).toEqual([
       { type: 'text', text: '<system-reminder>\nRemember this.\n</system-reminder>' },
     ]);
+    expect(context.get()[0]?.origin).toEqual({
+      kind: 'injection',
+      variant: 'host',
+    });
 
     const records = await readPersistedWireRecords(storage);
     expect(records.map((record) => record.type)).toEqual([
@@ -318,9 +322,34 @@ describe('AgentWireRecordService persistence', () => {
     ]);
     const record = records[1] as {
       type: 'context.append_system_reminder';
-      args: readonly [ContextMessage];
+      args: readonly [string, ContextMessage['origin']];
     };
-    expect(record.args[0].content).toEqual([{ type: 'text', text: 'Remember this.' }]);
+    expect(record.args).toEqual(['Remember this.', { kind: 'injection', variant: 'host' }]);
+  });
+
+  it('restores string system reminder args with origin as wrapped context messages', async () => {
+    const { wire, context } = await createWireHarness();
+
+    await wire.restore([
+      {
+        type: 'metadata',
+        protocol_version: AGENT_WIRE_PROTOCOL_VERSION,
+        created_at: 1,
+      },
+      {
+        type: 'context.append_system_reminder',
+        args: ['Remember this.', { kind: 'injection', variant: 'host' }],
+      },
+    ]);
+
+    const message = context.get()[0];
+    expect(message?.content).toEqual([
+      { type: 'text', text: '<system-reminder>\nRemember this.\n</system-reminder>' },
+    ]);
+    expect(message?.origin).toEqual({
+      kind: 'injection',
+      variant: 'host',
+    });
   });
 
   it('offloads large content part data URIs to blobsDir during append', async () => {