diff --git a/backend/__tests__/unit/routes/registry.agent-config-installer-gate.test.js b/backend/__tests__/unit/routes/registry.agent-config-installer-gate.test.js
index c33d9d634a..e663edcad2 100644
--- a/backend/__tests__/unit/routes/registry.agent-config-installer-gate.test.js
+++ b/backend/__tests__/unit/routes/registry.agent-config-installer-gate.test.js
@@ -512,6 +512,30 @@ describe('agent config PATCH — installer gate', () => {
     expect(AgentProfile.updateMany).not.toHaveBeenCalled();
   });
 
+  it('refuses a rename that collides with another installer\'s card in the same pod', async () => {
+    const primary = installation({ installedBy: MEMBER, displayName: 'Curator' });
+    const otherOwnersCard = installation({
+      agentName: 'guide', instanceId: 'u1234567890', podId: 'pod-1',
+      installedBy: INSTALLER, displayName: 'Scout',
+    });
+    setPod();
+    AgentInstallation.findOne.mockResolvedValue(primary);
+    AgentInstallation.find.mockResolvedValueOnce([primary]).mockResolvedValueOnce([primary, otherOwnersCard]);
+
+    const res = await request(app)
+      .patch('/api/registry/pods/pod-1/agents/openclaw')
+      .send({ instanceId: 'curator', displayName: 'scout' });
+
+    expect(res.status).toBe(409);
+    expect(res.body.code).toBe('agent_display_name_taken');
+    expect(AgentIdentityService.renameAgentDisplayName).not.toHaveBeenCalled();
+    expect(primary.save).not.toHaveBeenCalled();
+    expect(AgentInstallation.find).toHaveBeenLastCalledWith({
+      $or: [{ podId: { $in: ['pod-1'] } }, { installedBy: { $in: [MEMBER] } }],
+      status: 'active',
+    });
+  });
+
   it('refuses an admin rename that collides with the target installer\'s visible card', async () => {
     const primary = installation({ installedBy: INSTALLER, displayName: 'Curator' });
     const other = installation({
@@ -530,7 +554,8 @@ describe('agent config PATCH — installer gate', () => {
     expect(res.status).toBe(409);
     expect(res.body.code).toBe('agent_display_name_taken');
     expect(AgentInstallation.find).toHaveBeenLastCalledWith({
-      installedBy: { $in: [INSTALLER] }, status: 'active',
+      $or: [{ podId: { $in: ['pod-1'] } }, { installedBy: { $in: [INSTALLER] } }],
+      status: 'active',
     });
     expect(primary.displayName).toBe('Curator');
     expect(primary.save).not.toHaveBeenCalled();
@@ -561,7 +586,8 @@ describe('agent config PATCH — installer gate', () => {
     expect(res.status).toBe(409);
     expect(res.body.code).toBe('agent_display_name_taken');
     expect(AgentInstallation.find).toHaveBeenLastCalledWith({
-      installedBy: { $in: [INSTALLER, 'other-installer'] }, status: 'active',
+      $or: [{ podId: { $in: ['pod-1', 'pod-2'] } }, { installedBy: { $in: [INSTALLER, 'other-installer'] } }],
+      status: 'active',
     });
     expect(primary.save).not.toHaveBeenCalled();
     expect(peer.save).not.toHaveBeenCalled();
diff --git a/backend/routes/registry/agent-config.ts b/backend/routes/registry/agent-config.ts
index eb6ac5c525..ec5d61249d 100644
--- a/backend/routes/registry/agent-config.ts
+++ b/backend/routes/registry/agent-config.ts
@@ -349,16 +349,18 @@ agentConfigRouter.patch('/pods/:podId/agents/:name', auth, async (req: any, res:
       const { status: refusalStatus, ...refusalBody } = writeRefusal;
       return res.status(refusalStatus).json(refusalBody);
     }
-    // An installation can show a different label from its bot User. Guard
-    // every affected installer's active cards, including when an admin edits
-    // someone else's agent, before renaming the shared identity.
+    // An installation can show a different label from its bot User, and a pod
+    // lists every installer's card side by side. Guard every active card in
+    // each pod the rename reaches, whoever installed it, plus every card the
+    // affected installers hold elsewhere, before renaming the shared identity.
     if (displayName !== undefined) {
       const requestedName = displayName.trim().toLowerCase();
       const installerIds = Array.from(new Set(installationsToUpdate
         .map((entry: any) => entry.installedBy?.toString?.())
         .filter(Boolean)));
       const ownerInstallations = await AgentInstallation.find({
-        installedBy: { $in: installerIds }, status: 'active',
+        $or: [{ podId: { $in: writablePodIds } }, { installedBy: { $in: installerIds } }],
+        status: 'active',
       });
       const nameTaken = ownerInstallations.some((entry: any) => (
         !(entry.agentName === name.toLowerCase()