williamzujkowski/Kubernetes Manifest Generator

Purpose & When-To-Use

Trigger conditions:

• Need to generate Kubernetes Deployment and Service manifests
• Converting application specifications to K8s YAML
• Applying K8s best practices to existing manifests
• Validating manifest syntax and resource configurations
• Creating base manifests for Helm charts or Kustomize overlays

Not for:

• Complete production orchestration (use cloud-native-orchestrator agent)
• Helm chart templating with complex logic (use kubernetes-helm-builder skill)
• Service mesh configuration (use kubernetes-servicemesh-configurator skill)
• Multi-cloud deployment strategies (use cloud-native-orchestrator agent)

Pre-Checks

Time normalization:

• Compute NOW_ET using NIST/time.gov semantics (America/New_York, ISO-8601): 2025-10-26T01:33:54-04:00
• Use NOW_ET for all citation access dates

Input validation:

• workload_name must be DNS-1123 compliant (lowercase, alphanumeric, hyphens)
• workload_type must be one of: deployment, statefulset, daemonset, job, cronjob
• container_image must include tag (not :latest for production)
• replicas must be ≥1 (≥3 recommended for production)
• resources.requests must be ≤ resources.limits if both specified

Source freshness:

• Kubernetes API Reference (accessed 2025-10-26T01:33:54-04:00): https://kubernetes.io/docs/reference/kubernetes-api/ - verify v1.28+ APIs
• Kubernetes Best Practices (accessed 2025-10-26T01:33:54-04:00): https://kubernetes.io/docs/concepts/configuration/overview/
• Pod Security Standards (accessed 2025-10-26T01:33:54-04:00): https://kubernetes.io/docs/concepts/security/pod-security-standards/

Decision thresholds:

• T1 for basic manifests (Deployment + Service only)
• T2 for production configs (add security, network policies, resource optimization)

Procedure

T1: Basic Manifest Generation (≤2k tokens)

Step 1: Generate core Kubernetes manifests

• Create Deployment manifest with specified workload type, image, and replicas
• Add Service manifest if port is specified (ClusterIP by default)
• Include basic resource requests (cpu: 100m, memory: 128Mi) if not specified
• Add standard labels (app, version, component)

Step 2: Validate and output

• Return YAML manifests
• Provide kubectl dry-run validation command
• List next steps for T2 hardening

Abort conditions:

• Invalid workload_name (contains uppercase or special characters)
• Missing required inputs (workload_type, container_image)

T2: Production-Grade Manifests (≤6k tokens)

All T1 steps plus:

Step 1: Add health checks

• Configure liveness probe (httpGet, tcpSocket, or exec)
• Configure readiness probe with appropriate initial delays
• Set reasonable timeout and failure thresholds

Step 2: Apply security hardening

• Set securityContext: runAsNonRoot, readOnlyRootFilesystem
• Drop unnecessary capabilities (ALL by default, add only required)
• Apply Pod Security Standard: restricted profile
• Create ServiceAccount with least-privilege RBAC

Step 3: Add resource management

• Define CPU and memory requests based on workload type
• Set limits (typically 2x requests for burstable QoS)
• Add HorizontalPodAutoscaler for scalable workloads

Step 4: Network security

• Generate NetworkPolicy for pod-to-pod communication
• Implement default-deny with explicit allowlist rules

Step 5: Validate and report

• Run kubectl dry-run validation
• Check against kube-score or Polaris best practices
• Return compliance report with security posture

Abort conditions:

• Conflicting security requirements (e.g., privileged + restricted PSS)
• Missing health check endpoints for critical services

T3: Extended Configuration (≤12k tokens)

All T1 + T2 steps plus:

Step 1: Advanced workload features

• Add PersistentVolumeClaims for StatefulSets
• Configure affinity rules (podAntiAffinity for HA)
• Set topology spread constraints for multi-AZ
• Define PodDisruptionBudget

Step 2: Complete GitOps structure

• Organize manifests for Kustomize base/overlays
• Add namespace and resource quota definitions
• Include monitoring ServiceMonitor CRDs

Output:

• Complete manifest directory structure
• Validation results and best practices compliance
• Kustomization.yaml for GitOps workflows

Decision Rules

Workload type selection:

• Deployment: Stateless applications, horizontal scaling
• StatefulSet: Stateful apps needing stable network identity, ordered deployment
• DaemonSet: Node-level services (logging, monitoring agents)
• Job: One-time batch processing
• CronJob: Scheduled batch tasks

Resource sizing defaults:

• Small workload (APIs, web servers): cpu: 100m-250m, memory: 128Mi-512Mi
• Medium workload (data processing): cpu: 500m-1000m, memory: 512Mi-2Gi
• Large workload (ML, analytics): cpu: 2000m+, memory: 4Gi+

Health check defaults:

• HTTP services: httpGet probe on /health or /ready endpoints
• TCP services: tcpSocket probe on service port
• Batch jobs: No liveness probe, use restartPolicy: OnFailure

Ambiguity handling:

• If resource requirements unknown → use small defaults + recommend load testing
• If health check endpoint unknown → request application health endpoint details
• If security context conflicts → apply most restrictive settings and warn

Output Contract

Required fields (all tiers):

yaml
kubernetes_manifests:
  deployment: "Deployment YAML with metadata, spec, containers"
  service: "Service YAML (if port specified)"

validation_results:
  syntax_valid: boolean
  kubectl_dry_run: "command output or error"

best_practices_report:
  checks_passed: integer
  checks_failed: integer
  recommendations: ["array of improvement suggestions"]

Additional T2 fields:

yaml
security_config:
  service_account: "ServiceAccount YAML"
  rbac_role: "Role or ClusterRole YAML"
  rbac_binding: "RoleBinding YAML"
  network_policy: "NetworkPolicy YAML"
  pod_security_standard: "restricted | baseline | privileged"

autoscaling:
  hpa: "HorizontalPodAutoscaler YAML (if applicable)"
  metrics: ["cpu", "memory", "custom"]

Additional T3 fields:

yaml
advanced_features:
  pvc: "PersistentVolumeClaim YAML (if StatefulSet)"
  pdb: "PodDisruptionBudget YAML"
  affinity_rules: "Pod affinity configuration"

gitops_structure:
  kustomization: "Kustomization.yaml for base"
  namespace: "Namespace YAML with ResourceQuota"
  service_monitor: "Prometheus ServiceMonitor CRD (if applicable)"

Examples

yaml
# T1 Example: Basic Deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-api
  labels:
    app: web-api
    version: v1.0.0
spec:
  replicas: 3
  selector:
    matchLabels:
      app: web-api
  template:
    metadata:
      labels:
        app: web-api
    spec:
      containers:
      - name: api
        image: myregistry/web-api:1.0.0
        ports:
        - containerPort: 8080
        resources:
          requests: {cpu: 100m, memory: 128Mi}
          limits: {cpu: 200m, memory: 256Mi}

(Service manifest generated alongside Deployment)

Quality Gates

Token budgets (enforced):

• T1: ≤2,000 tokens - basic Deployment + Service generation
• T2: ≤6,000 tokens - production hardening with security and health checks
• T3: ≤12,000 tokens - advanced features and GitOps structure

Safety checks:

• No privileged containers unless explicitly required
• Resource limits defined for all containers
• SecurityContext enforces non-root user (T2+)
• NetworkPolicies restrict traffic to necessary paths (T2+)

Auditability:

• All manifests use explicit API versions (apps/v1, v1, networking.k8s.io/v1)
• Security controls cite Pod Security Standards
• Resource sizing includes rationale

Determinism:

• Same inputs produce identical YAML output
• Label conventions follow Kubernetes recommended labels
• Manifest structure follows community best practices

Validation requirements:

• All manifests must pass kubectl apply --dry-run=client -f -
• T2+ manifests must pass kube-score with score ≥7/10

Resources

Official Documentation (accessed 2025-10-26T01:33:54-04:00):

• Kubernetes Workload Resources: https://kubernetes.io/docs/concepts/workloads/
• Kubernetes Services: https://kubernetes.io/docs/concepts/services-networking/service/
• Resource Management: https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/
• Health Checks: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/
• Pod Security Standards: https://kubernetes.io/docs/concepts/security/pod-security-standards/
• Network Policies: https://kubernetes.io/docs/concepts/services-networking/network-policies/

Validation Tools:

• kube-score: https://github.com/zegl/kube-score
• Polaris: https://github.com/FairwindsOps/polaris
• kubectl dry-run: https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#-em-apply-em-

Best Practices:

• Configuration Best Practices: https://kubernetes.io/docs/concepts/configuration/overview/
• Recommended Labels: https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/