magnus919_agent-skills/platform-engineering/SKILL.md

name, description, license, metadata

name	description	license	metadata
platform-engineering	Use this skill when building or operating internal developer platforms: infrastructure as code, CI/CD, container orchestration, service networking, secrets, and observability. Do not use it to define release process, promotion, rollout, or rollback policy; use release-engineering for that delivery model.	MIT	tags source_repo https://github.com/magnus919/hermes-profiles

Platform Engineering

Core methodology and reference library for platform engineering work. This skill does not execute operations itself — it provides the frameworks, patterns, and reference material that a platform-engineer profile loads on demand.

When to Load

Load this skill when the task involves:

Trigger	What's Needed
Design a CI/CD pipeline	Pipeline structure, GitOps sync strategies, release automation
Infrastructure as code plan	Terraform/OpenTofu module patterns, state management, Pulumi/Ansible patterns
Container orchestration design	K8s pod lifecycle, Helm chart conventions, Kustomize overlays, Docker Compose; operating a cluster (manifests, RBAC, workloads, upgrades) routes to kubernetes
Service networking / mesh	Traefik/nginx/Caddy config, Tailscale/Headscale ACL, WireGuard, service mesh
Observability strategy	Prometheus rules, Grafana dashboards-as-code, Loki logging, tracing; operating the Prometheus/OTel/Loki stack (scrape, rules, retention) routes to telemetry, Grafana product work routes to grafana
Infrastructure execution	Terraform/OpenTofu plan/apply workflow, state backends, drift detection, upgrades — route to terraform
PostgreSQL operations	Server config review, indexes and query plans, vacuum/bloat, backups/PITR, replication — route to postgres
Secret management design	Vault, SOPS, External Secrets Operator patterns
Cloud architecture assessment	Multi-cloud patterns, provider foundations, cost governance
Deployment pipeline review	Delivery-platform architecture; load release-engineering when defining the release model, promotion gates, rollout, or rollback policy

When not to use

Use release-engineering to define release process, promotion, rollout, or rollback policy. This skill builds and operates the delivery platform that implements those decisions.

Loading Order

skill_view('platform-engineering')          # This — methodology index
skill_view('artifact-pyramids')              # Output contract
skill_view('docker-compose')                 # Container lifecycle and Compose (if needed)
skill_view('traefik')                        # Reverse proxy (if needed)
skill_view('tailscale')                      # Mesh networking (if needed)
skill_view('implementation-planning')        # Work breakdown (if needed)

Then load domain-specific references from this skill:

skill_view('platform-engineering', file_path='references/ci-cd-pipelines.md')
skill_view('platform-engineering', file_path='references/infrastructure-as-code.md')
# ... etc per domain

Reference Files

Reference	Purpose
references/ci-cd-pipelines.md	GitHub Actions, GitLab CI, Forgejo CI, Jenkins, CircleCI; GitOps with ArgoCD/Flux; release automation
references/container-orchestration.md	K8s/k3s, Helm chart conventions, Kustomize overlays, RBAC patterns, Docker Compose production patterns
references/infrastructure-as-code.md	Terraform/OpenTofu module design, state backends, Pulumi project structure, Ansible roles, CloudFormation/CDK
references/service-networking.md	Reverse proxy config (Traefik, nginx, Caddy), Tailscale/Headscale ACL, WireGuard topology, service mesh (Istio, Cilium)
references/observability.md	Prometheus recording rules/alerting, Grafana dashboards-as-code, Loki log aggregation, OpenTelemetry tracing
references/secret-management.md	HashiCorp Vault auth/policies, SOPS/age encryption in Git, External Secrets Operator, Sealed Secrets
references/cloud-platforms.md	AWS/GCP/Azure foundational services, multi-cloud design, cost governance, provider abstraction
references/automation-languages.md	Go CLI patterns, Python SDK integration, Bash bootstrap/conventions for platform tooling
references/release-engineering.md	Container image lifecycle, artifact versioning strategies, release gate checklists, Helm chart promotion

Templates

Template	When to Use
templates/golden-path-self-service-portal.md	Designing a golden path or self-service portal for a developer workflow (scoping, journey, guardrails, escape hatch, metrics)
templates/iac-review-record.md	Recording a structured review of Terraform/OpenTofu/Pulumi/Ansible modules before they ship
templates/observability-contract.md	Declaring the metrics/logs/traces contract a service must meet before production traffic

Output Contract

The profile using this skill produces artifact pyramids. The response to any caller is the absolute path to 00-index.md. See artifact-pyramids skill for the specification.

Design Principles

1. The platform is a product. Internal developers are your customers. Their productivity, satisfaction, and cognitive load are the primary metrics.
2. Golden paths, not golden cages. Provide paved roads for common workflows but allow escape hatches. Make the right thing easy, not the wrong thing impossible.
3. Reduce cognitive load. Abstract infrastructure complexity. Developers should not need to understand Kubernetes internals or Terraform state management to deploy their service.
4. Everything as code. Infrastructure, configuration, pipelines, and policies are version-controlled, reviewed, and reproducible. Git is the single source of truth.
5. Self-service over tickets. Every manual handoff between teams is a bottleneck. If a developer needs another team to deploy, the platform is incomplete.
6. Automation is the default. If a process can be automated, it must be. Manual operations are toil — tax on the organization.
7. Observability is infrastructure. Logs, metrics, traces, and dashboards are platform contract, not optional extras. Every service gets them by default.
8. Security is built in, not bolted on. Supply chain security, secret management, vulnerability scanning, and policy enforcement are platform responsibilities.
9. API-first design. Everything the platform does should be accessible via API — enabling automation, self-service portals, and CLI tools.

Related Skills

• artifact-pyramids — output contract specification
• docker-compose — container lifecycle and multi-container Compose orchestration
• kubernetes — cluster operations: manifests, RBAC, workloads, Helm, upgrades, troubleshooting
• terraform — Terraform/OpenTofu execution: plan/apply workflow, state backends and locking, drift detection, upgrades and refactors
• telemetry — Prometheus/OpenTelemetry Collector/Loki stack operations: scrape configs, rules files, retention, HA
• postgres — PostgreSQL operations: configuration review, index and query-plan diagnosis, vacuum/bloat, backups/PITR, replication and failover
• grafana — Grafana product work: dashboards, panels, data sources, alert rules, contact points, notification policies
• traefik — reverse proxy and ingress configuration
• tailscale — mesh networking and ACL policies
• implementation-planning — work breakdown and dependency ordering
• mermaid-diagrams — architecture diagram generation
• site-reliability-engineering — sister domain for post-deployment reliability
• release-engineering — release process, artifact promotion, readiness, rollout, and rollback policy; this skill owns the delivery platform that implements those decisions