diff --git a/frontend/src/adapters/http/streamGateways.ts b/frontend/src/adapters/http/streamGateways.ts
index 67e0daf..fe45103 100644
--- a/frontend/src/adapters/http/streamGateways.ts
+++ b/frontend/src/adapters/http/streamGateways.ts
@@ -286,6 +286,16 @@ export class HttpTicketGateway implements TicketGateway {
     private readonly ws: WsLiveClient,
   ) {}
 
+  private normalizeTicketActor(actor: unknown): Ticket["createdBy"] {
+    if (!actor || typeof actor !== "object") return { kind: "user" };
+    const rec = actor as Record<string, unknown>;
+    if (rec.kind === "user" || rec.kind === "system") return { kind: rec.kind };
+    if (rec.kind === "agent" && typeof rec.agentId === "string" && rec.agentId) {
+      return { kind: "agent", agentId: rec.agentId };
+    }
+    return { kind: "user" };
+  }
+
   private normalizeTicket(ticket: Ticket): Ticket {
     return {
       ...ticket,
@@ -294,6 +304,8 @@ export class HttpTicketGateway implements TicketGateway {
         ? ticket.assignedAgentIds
         : [],
       attachments: Array.isArray(ticket.attachments) ? ticket.attachments : [],
+      createdBy: this.normalizeTicketActor(ticket.createdBy),
+      updatedBy: this.normalizeTicketActor(ticket.updatedBy),
     };
   }
 
@@ -306,6 +318,7 @@ export class HttpTicketGateway implements TicketGateway {
             assignedAgentIds: Array.isArray(item.assignedAgentIds)
               ? item.assignedAgentIds
               : [],
+            createdBy: this.normalizeTicketActor(item.createdBy),
           }))
         : [],
     };
diff --git a/frontend/src/adapters/http/ticketGateway.test.ts b/frontend/src/adapters/http/ticketGateway.test.ts
new file mode 100644
index 0000000..3225491
--- /dev/null
+++ b/frontend/src/adapters/http/ticketGateway.test.ts
@@ -0,0 +1,82 @@
+import { describe, it, expect, vi } from "vitest";
+
+import { HttpTicketGateway } from "./streamGateways";
+import type { HttpInvoker } from "./httpInvoker";
+import type { WsLiveClient } from "./wsLiveClient";
+
+function gateway(result: unknown): {
+  gw: HttpTicketGateway;
+  invoke: ReturnType<typeof vi.fn>;
+} {
+  const invoke = vi.fn().mockResolvedValue(result);
+  const http = { invoke } as unknown as HttpInvoker;
+  const ws = {} as unknown as WsLiveClient;
+  return { gw: new HttpTicketGateway(http, ws), invoke };
+}
+
+describe("HttpTicketGateway normalization", () => {
+  it("normalizes legacy ticket list rows that omit assignedAgentIds and createdBy", async () => {
+    const { gw } = gateway({
+      items: [
+        {
+          ref: "#12",
+          path: ".ideai/tickets/12/issue.md",
+          title: "Legacy row",
+          status: "open",
+          priority: "medium",
+          updatedAt: 1,
+        },
+      ],
+    });
+
+    const list = await gw.list("proj-1");
+
+    expect(list.items[0]?.assignedAgentIds).toEqual([]);
+    expect(list.items[0]?.createdBy).toEqual({ kind: "user" });
+  });
+
+  it("normalizes legacy ticket payloads that omit array fields and actors", async () => {
+    const { gw } = gateway({
+      id: "issue-1",
+      ref: "#12",
+      number: 12,
+      title: "Legacy",
+      description: "",
+      status: "open",
+      priority: "medium",
+      createdAt: 1,
+      updatedAt: 1,
+      version: 1,
+    });
+
+    const ticket = await gw.read("proj-1", "#12", true);
+
+    expect(ticket.links).toEqual([]);
+    expect(ticket.assignedAgentIds).toEqual([]);
+    expect(ticket.attachments).toEqual([]);
+    expect(ticket.createdBy).toEqual({ kind: "user" });
+    expect(ticket.updatedBy).toEqual({ kind: "user" });
+  });
+
+  it("normalizes malformed ticket actors", async () => {
+    const { gw } = gateway({
+      id: "issue-1",
+      ref: "#12",
+      number: 12,
+      title: "Legacy",
+      description: "",
+      status: "open",
+      priority: "medium",
+      createdBy: { kind: "agent" },
+      updatedBy: { kind: "unknown" },
+      createdAt: 1,
+      updatedAt: 1,
+      version: 1,
+    });
+
+    const ticket = await gw.read("proj-1", "#12", true);
+
+    expect(ticket.createdBy).toEqual({ kind: "user" });
+    expect(ticket.updatedBy).toEqual({ kind: "user" });
+  });
+});
diff --git a/frontend/src/adapters/ticket.test.ts b/frontend/src/adapters/ticket.test.ts
index 273ef85..8edf730 100644
--- a/frontend/src/adapters/ticket.test.ts
+++ b/frontend/src/adapters/ticket.test.ts
@@ -55,7 +55,7 @@ describe("TauriTicketGateway invoke payloads", () => {
     });
   });
 
-  it("normalizes legacy ticket list rows that omit assignedAgentIds", async () => {
+  it("normalizes legacy ticket list rows that omit assignedAgentIds and createdBy", async () => {
     invoke.mockResolvedValueOnce({
       items: [
         {
@@ -64,7 +64,6 @@ describe("TauriTicketGateway invoke payloads", () => {
           title: "Legacy row",
           status: "open",
           priority: "medium",
-          createdBy: { kind: "user" },
           updatedAt: 1,
         },
       ],
@@ -73,6 +72,7 @@ describe("TauriTicketGateway invoke payloads", () => {
     const list = await new TauriTicketGateway().list("proj-1");
 
     expect(list.items[0]?.assignedAgentIds).toEqual([]);
+    expect(list.items[0]?.createdBy).toEqual({ kind: "user" });
   });
 
   it("wraps ticket attachment commands in the request DTO", async () => {
@@ -118,7 +118,7 @@ describe("TauriTicketGateway invoke payloads", () => {
     );
   });
 
-  it("normalizes legacy ticket payloads that omit array fields", async () => {
+  it("normalizes legacy ticket payloads that omit array fields and actors", async () => {
     invoke.mockResolvedValueOnce({
       id: "issue-1",
       ref: "#12",
@@ -127,8 +127,6 @@ describe("TauriTicketGateway invoke payloads", () => {
       description: "",
       status: "open",
       priority: "medium",
-      createdBy: { kind: "user" },
-      updatedBy: { kind: "user" },
       createdAt: 1,
       updatedAt: 1,
       version: 1,
@@ -139,5 +137,29 @@ describe("TauriTicketGateway invoke payloads", () => {
     expect(ticket.links).toEqual([]);
     expect(ticket.assignedAgentIds).toEqual([]);
     expect(ticket.attachments).toEqual([]);
+    expect(ticket.createdBy).toEqual({ kind: "user" });
+    expect(ticket.updatedBy).toEqual({ kind: "user" });
+  });
+
+  it("normalizes malformed ticket actors", async () => {
+    invoke.mockResolvedValueOnce({
+      id: "issue-1",
+      ref: "#12",
+      number: 12,
+      title: "Legacy",
+      description: "",
+      status: "open",
+      priority: "medium",
+      createdBy: { kind: "agent" },
+      updatedBy: { kind: "unknown" },
+      createdAt: 1,
+      updatedAt: 1,
+      version: 1,
+    });
+
+    const ticket = await new TauriTicketGateway().read("proj-1", "#12", true);
+
+    expect(ticket.createdBy).toEqual({ kind: "user" });
+    expect(ticket.updatedBy).toEqual({ kind: "user" });
   });
 });
diff --git a/frontend/src/adapters/ticket.ts b/frontend/src/adapters/ticket.ts
index 459660d..0a0d69d 100644
--- a/frontend/src/adapters/ticket.ts
+++ b/frontend/src/adapters/ticket.ts
@@ -42,6 +42,18 @@ export function isTicketVersionConflict(error: unknown): boolean {
   return typeof message === "string" && message.includes("version conflict");
 }
 
+const LEGACY_TICKET_ACTOR: Ticket["createdBy"] = { kind: "user" };
+
+function normalizeTicketActor(actor: unknown): Ticket["createdBy"] {
+  if (!actor || typeof actor !== "object") return LEGACY_TICKET_ACTOR;
+  const rec = actor as Record<string, unknown>;
+  if (rec.kind === "user" || rec.kind === "system") return { kind: rec.kind };
+  if (rec.kind === "agent" && typeof rec.agentId === "string" && rec.agentId) {
+    return { kind: "agent", agentId: rec.agentId };
+  }
+  return LEGACY_TICKET_ACTOR;
+}
+
 function normalizeTicket(ticket: Ticket): Ticket {
   return {
     ...ticket,
@@ -50,6 +62,8 @@ function normalizeTicket(ticket: Ticket): Ticket {
       ? ticket.assignedAgentIds
       : [],
     attachments: Array.isArray(ticket.attachments) ? ticket.attachments : [],
+    createdBy: normalizeTicketActor(ticket.createdBy),
+    updatedBy: normalizeTicketActor(ticket.updatedBy),
   };
 }
 
@@ -62,6 +76,7 @@ function normalizeTicketList(list: TicketList): TicketList {
           assignedAgentIds: Array.isArray(item.assignedAgentIds)
             ? item.assignedAgentIds
             : [],
+          createdBy: normalizeTicketActor(item.createdBy),
         }))
       : [],
   };