diff --git a/src/mcpd/src/services/k8s/manifest-generator.ts b/src/mcpd/src/services/k8s/manifest-generator.ts
index 1596663..670679d 100644
--- a/src/mcpd/src/services/k8s/manifest-generator.ts
+++ b/src/mcpd/src/services/k8s/manifest-generator.ts
@@ -34,6 +34,7 @@ export interface K8sPodManifest {
     }>;
     restartPolicy: 'Always' | 'Never' | 'OnFailure';
     automountServiceAccountToken: boolean;
+    nodeSelector?: Record<string, string>;
   };
 }
 
@@ -145,6 +146,11 @@ export function generatePodSpec(spec: ContainerSpec, namespace: string): K8sPodM
       restartPolicy: 'Always',
       // MCP server pods don't need k8s API access
       automountServiceAccountToken: false,
+      // On mixed-arch clusters, constrain to the same arch as mcpd
+      // (runner images are typically single-arch)
+      ...(process.env['MCPD_NODE_SELECTOR']
+        ? { nodeSelector: JSON.parse(process.env['MCPD_NODE_SELECTOR']) as Record<string, string> }
+        : {}),
     },
   };
 }