diff --git a/src/messaging/inbound.test.ts b/src/messaging/inbound.test.ts
index 8c507f7..df7d668 100644
--- a/src/messaging/inbound.test.ts
+++ b/src/messaging/inbound.test.ts
@@ -75,11 +75,21 @@ describe("weixinMessageToMsgContext", () => {
     expect(ctx.Timestamp).toBe(1700000000000);
   });
 
+  it("populates SenderId from from_user_id so OpenClaw core can route per-sender peer state", () => {
+    // Without SenderId, downstream memory plugins (honcho, etc.) collapse all senders
+    // into a single peer because `buildInboundUserContextPrefix` reads `ctx.SenderId`
+    // when emitting the inbound `Conversation info` metadata block. Multi-user setups
+    // depend on this field being populated.
+    const ctx = weixinMessageToMsgContext(baseMsg, "account1");
+    expect(ctx.SenderId).toBe("user123");
+  });
+
   it("handles missing from_user_id", () => {
     const msg: WeixinMessage = { item_list: [] };
     const ctx = weixinMessageToMsgContext(msg, "acc");
     expect(ctx.From).toBe("");
     expect(ctx.To).toBe("");
+    expect(ctx.SenderId).toBe("");
   });
 
   it("handles empty item_list", () => {
diff --git a/src/messaging/inbound.ts b/src/messaging/inbound.ts
index fc25ab8..1632cee 100644
--- a/src/messaging/inbound.ts
+++ b/src/messaging/inbound.ts
@@ -147,6 +147,13 @@ export type WeixinMsgContext = {
   Timestamp?: number;
   Provider: "openclaw-weixin";
   ChatType: "direct";
+  /**
+   * The sender's wxid. Read by OpenClaw core's `buildInboundUserContextPrefix` to populate
+   * the `sender_id` field of the inbound `Conversation info` metadata block, which downstream
+   * memory plugins (e.g. honcho) use to route per-sender peer state. Without this, multi-user
+   * scenarios collapse all senders into a single peer.
+   */
+  SenderId?: string;
   /** Set by monitor after resolveAgentRoute so dispatchReplyFromConfig uses the correct session. */
   SessionKey?: string;
   context_token?: string;
@@ -231,6 +238,7 @@ export function weixinMessageToMsgContext(
     OriginatingChannel: "openclaw-weixin",
     OriginatingTo: from_user_id,
     MessageSid: generateMessageSid(),
+    SenderId: from_user_id,
     Timestamp: msg.create_time_ms,
     Provider: "openclaw-weixin",
     ChatType: "direct",