diff --git a/desktop/src/features/agents/ui/PersonaCatalogDialog.tsx b/desktop/src/features/agents/ui/PersonaCatalogDialog.tsx
index ba76d6e4ed..e1ec946092 100644
--- a/desktop/src/features/agents/ui/PersonaCatalogDialog.tsx
+++ b/desktop/src/features/agents/ui/PersonaCatalogDialog.tsx
@@ -2,6 +2,7 @@ import * as React from "react";
 
 import { isCatalogPersonaSelected } from "@/features/agents/lib/catalog";
 import { isCatalogPersona } from "@/features/agents/lib/personaCatalogRelay";
+import { useUsersBatchQuery } from "@/features/profile/hooks";
 import { ProfileAvatar } from "@/features/profile/ui/ProfileAvatar";
 import type { AgentPersona } from "@/shared/api/types";
 import { useFeedbackToasts } from "@/shared/hooks/useToastEffect";
@@ -276,7 +277,42 @@ function PersonaCatalogChooser({
   );
 }
 
+/**
+ * Derives the "Added by" label for a catalog entry from a resolved profile
+ * summary. Prefers `displayName`, falls back to `name`, then to the default
+ * "Community member" string when both are absent, null, or whitespace-only.
+ */
+export function resolveCatalogOwnerLabel(
+  summary:
+    | { displayName?: string | null; name?: string | null }
+    | null
+    | undefined,
+): string {
+  return (
+    summary?.displayName?.trim() || summary?.name?.trim() || "Community member"
+  );
+}
+
 function PersonaCatalogDetail({ persona }: { persona: AgentPersona }) {
+  const isCommunityEntry =
+    isCatalogPersona(persona) && !persona.catalogSource.isOwn;
+  const ownerPubkey = isCommunityEntry
+    ? persona.catalogSource.ownerPubkey
+    : undefined;
+  const ownerBatchQuery = useUsersBatchQuery(ownerPubkey ? [ownerPubkey] : [], {
+    enabled: !!ownerPubkey,
+  });
+
+  let addedByLabel: string;
+  if (!isCommunityEntry) {
+    addedByLabel = "You";
+  } else {
+    const summary = ownerPubkey
+      ? ownerBatchQuery.data?.profiles[ownerPubkey.toLowerCase()]
+      : undefined;
+    addedByLabel = resolveCatalogOwnerLabel(summary);
+  }
+
   return (
     <div className="w-full min-w-0 max-w-full space-y-6 overflow-x-hidden">
       <div className="flex items-center gap-3">
@@ -290,14 +326,7 @@ function PersonaCatalogDetail({ persona }: { persona: AgentPersona }) {
             {persona.displayName}
           </h3>
           {persona.isBuiltIn ? null : (
-            <PersonaAddedBy
-              className="mt-0.5"
-              label={
-                isCatalogPersona(persona) && !persona.catalogSource.isOwn
-                  ? "Community member"
-                  : "You"
-              }
-            />
+            <PersonaAddedBy className="mt-0.5" label={addedByLabel} />
           )}
         </div>
       </div>
diff --git a/desktop/src/features/agents/ui/personaCatalogOwnerLabel.test.mjs b/desktop/src/features/agents/ui/personaCatalogOwnerLabel.test.mjs
new file mode 100644
index 0000000000..7ad726352f
--- /dev/null
+++ b/desktop/src/features/agents/ui/personaCatalogOwnerLabel.test.mjs
@@ -0,0 +1,77 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { resolveCatalogOwnerLabel } from "./PersonaCatalogDialog.tsx";
+
+// ── null / undefined summary ──────────────────────────────────────────────────
+
+test("test_null_summary_returns_community_member", () => {
+  assert.equal(resolveCatalogOwnerLabel(null), "Community member");
+});
+
+test("test_undefined_summary_returns_community_member", () => {
+  assert.equal(resolveCatalogOwnerLabel(undefined), "Community member");
+});
+
+// ── populated displayName ─────────────────────────────────────────────────────
+
+test("test_display_name_present_returns_display_name", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: "Alice", name: "alice" }),
+    "Alice",
+  );
+});
+
+test("test_display_name_present_without_name_returns_display_name", () => {
+  assert.equal(resolveCatalogOwnerLabel({ displayName: "Alice" }), "Alice");
+});
+
+// ── empty / whitespace displayName with valid name ────────────────────────────
+
+test("test_empty_display_name_falls_through_to_name", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: "", name: "alice" }),
+    "alice",
+  );
+});
+
+test("test_whitespace_only_display_name_falls_through_to_name", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: "   ", name: "alice" }),
+    "alice",
+  );
+});
+
+// ── both candidates absent / empty ────────────────────────────────────────────
+
+test("test_both_null_returns_community_member", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: null, name: null }),
+    "Community member",
+  );
+});
+
+test("test_both_empty_returns_community_member", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: "", name: "" }),
+    "Community member",
+  );
+});
+
+test("test_both_whitespace_returns_community_member", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: "  ", name: "\t" }),
+    "Community member",
+  );
+});
+
+test("test_display_name_absent_name_present_returns_name", () => {
+  assert.equal(resolveCatalogOwnerLabel({ name: "alice" }), "alice");
+});
+
+test("test_display_name_null_name_present_returns_name", () => {
+  assert.equal(
+    resolveCatalogOwnerLabel({ displayName: null, name: "alice" }),
+    "alice",
+  );
+});
diff --git a/desktop/tests/e2e/agents.spec.ts b/desktop/tests/e2e/agents.spec.ts
index 8c1c407df1..a86443f58a 100644
--- a/desktop/tests/e2e/agents.spec.ts
+++ b/desktop/tests/e2e/agents.spec.ts
@@ -1791,8 +1791,10 @@ test("a community member can discover and add another member's catalog agent", a
   );
   await expect(remoteEntry).toContainText("Alice’s Reviewer");
   await remoteEntry.click();
+  // The detail pane resolves the publisher's display name; 'Community member'
+  // is only the fallback for an unresolvable pubkey.
   await expect(page.getByTestId("persona-catalog-detail-pane")).toContainText(
-    "Added by Community member",
+    "Added by alice",
   );
 
   await page
@@ -1845,6 +1847,38 @@ test("a community member can discover and add another member's catalog agent", a
   expect(await countCommandInvocations(page, "create_persona")).toBe(1);
 });
 
+test("catalog detail shows Community member when the publisher profile cannot be resolved", async ({
+  page,
+}) => {
+  // A pubkey that is not in the mock profile registry — profile resolution
+  // will fail and the detail pane must fall back gracefully.
+  const unknownPubkey =
+    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
+  const personaId = "unresolvable-reviewer";
+  await installMockBridge(page, {
+    personaCatalogEvents: [
+      createCatalogEvent({
+        ownerPubkey: unknownPubkey,
+        sourcePersonaId: personaId,
+        displayName: "Mystery Agent",
+        systemPrompt: "Published by someone whose profile cannot be fetched.",
+      }),
+    ],
+  });
+  await gotoApp(page);
+  await page.getByTestId("open-agents-view").click();
+  await openPersonaCatalog(page);
+
+  await page
+    .getByTestId(
+      `persona-catalog-list-item-catalog:${unknownPubkey}:${personaId}`,
+    )
+    .click();
+  await expect(page.getByTestId("persona-catalog-detail-pane")).toContainText(
+    "Added by Community member",
+  );
+});
+
 test("one share level selector drives both the link and send paths", async ({
   page,
 }) => {