diff --git a/backend/__tests__/unit/services/agentIdentityService.resolveAgentDisplayLabel.test.js b/backend/__tests__/unit/services/agentIdentityService.resolveAgentDisplayLabel.test.js
index b4876a77b8..30d86636b9 100644
--- a/backend/__tests__/unit/services/agentIdentityService.resolveAgentDisplayLabel.test.js
+++ b/backend/__tests__/unit/services/agentIdentityService.resolveAgentDisplayLabel.test.js
@@ -81,6 +81,45 @@ describe('resolveAgentDisplayLabel', () => {
       expect(resolveAgentDisplayLabel(user)).toBe('aria');
     });
 
+    // TASK-551: Scout is a product agent, not a shared runtime. Its curated
+    // label equals its agentName on a per-user instance, and that label must
+    // show, not the raw instance id.
+    it('keeps a product agent\'s curated label that equals its agentName (Scout)', () => {
+      const user = {
+        username: 'scout-ubd1004e0d7',
+        botMetadata: { displayName: 'Scout', agentName: 'scout', instanceId: 'ubd1004e0d7' },
+      };
+      expect(resolveAgentDisplayLabel(user)).toBe('Scout');
+    });
+
+    // The shared-runtime set is wider than openclaw: a codex seat that takes
+    // its officialDisplayName ('Codex') must still fall back to its instance.
+    it('still falls back to instanceId when a shared codex runtime name leaks as displayName', () => {
+      const user = {
+        username: 'codex-cody',
+        botMetadata: { displayName: 'Codex', agentName: 'codex', instanceId: 'cody' },
+      };
+      expect(resolveAgentDisplayLabel(user)).toBe('cody');
+    });
+
+    // claude-code is a shared runtime too. Its runtime name and its
+    // officialDisplayName 'Claude Code' both fall back to the instanceId.
+    it('falls back to instanceId when a shared claude-code runtime name leaks as displayName', () => {
+      const user = {
+        username: 'claude-code-ops',
+        botMetadata: { displayName: 'claude-code', agentName: 'claude-code', instanceId: 'ops' },
+      };
+      expect(resolveAgentDisplayLabel(user)).toBe('ops');
+    });
+
+    it('falls back to instanceId when the claude-code officialDisplayName leaks as displayName', () => {
+      const user = {
+        username: 'claude-code-ops',
+        botMetadata: { displayName: 'Claude Code', agentName: 'claude-code', instanceId: 'ops' },
+      };
+      expect(resolveAgentDisplayLabel(user)).toBe('ops');
+    });
+
     it('is case-insensitive — "OpenClaw (Pixel)" still rejected', () => {
       const user = {
         username: 'openclaw-pixel',
diff --git a/backend/utils/agentDisplayLabel.ts b/backend/utils/agentDisplayLabel.ts
index d52928a27f..7fc1a9be9f 100644
--- a/backend/utils/agentDisplayLabel.ts
+++ b/backend/utils/agentDisplayLabel.ts
@@ -1,3 +1,19 @@
+// agentNames that name a shared runtime, not an agent. Only these can leak
+// their runtime name as a displayName. A product agent that happens to share
+// its name with its curated label keeps that label: 'Scout' on agentName 'scout'
+// (TASK-551). commonly-bot and commonly-summarizer are product agents too, so
+// their displayName shows even when it equals their agentName. A codex seat
+// created without a displayName takes the officialDisplayName 'Codex'
+// (agentIdentityService.ts), and a claude-code seat takes 'Claude Code', so both
+// must stay here.
+const SHARED_RUNTIME_AGENT_NAMES = new Set(['openclaw', 'codex', 'claude-code']);
+
+// Equal names ignoring case, spaces and hyphens, so the officialDisplayName
+// 'Claude Code' is the same leak as the agentName 'claude-code'.
+const sameName = (a: string, b: string): boolean => (
+  a.toLowerCase().replace(/[\s-]/g, '') === b.toLowerCase().replace(/[\s-]/g, '')
+);
+
 // Resolve the human-readable label for an agent User row. The fallback
 // chain is intentional and load-bearing for any UI / pod-naming surface
 // that shows agent identity (agent-dm pod names, sidebar member rows):
@@ -44,7 +60,9 @@ export function resolveAgentDisplayLabel(
     !!display
     && !!agentName
     && (
-      (!!instanceId && instanceId !== 'default' && display.toLowerCase() === agentName.toLowerCase())
+      (!!instanceId && instanceId !== 'default'
+        && SHARED_RUNTIME_AGENT_NAMES.has(agentName.toLowerCase())
+        && sameName(display, agentName))
       || (
         !!instanceId
         && display.toLowerCase() === `${agentName.toLowerCase()} (${instanceId.toLowerCase()})`