For SRE and DevOps · free and open source (MIT)

An on-call engineer's habits, for your coding agent.

sre-skills teach Claude Code, Codex, Cursor and Gemini CLI to handle production the way an experienced on-call engineer does: read the evidence before forming a theory, mitigate before explaining, and never touch prod without showing you the command, its blast radius and how to undo it.

Any agent

npx skills add polytheseus/sre-skills

Claude Code

/plugin marketplace add polytheseus/sre-skills
/plugin install sre@sre-skills

View on GitHub See the Pro pack

What it's like

> checkout is throwing 5xx since about 14:02, can you look?

Reading before guessing. Error rate on checkout went from 0.2% to 31% at 14:02:40. Deploy checkout v2.31 finished at 14:01:55; nothing else changed in that window. New error in the logs since then: PG connection pool exhausted (max=20).

Impact: about a third of checkouts failing, all regions.
Likely cause: v2.31 (pool size config changed from 50 to 20).

Proposed mitigation (needs your OK):

kubectl rollout undo deployment/checkout -n shop

Blast radius: checkout pods only, rolling, no downtime. Undo: kubectl rollout undo again. I'll draft the status update while you decide.

An illustrative session. The skills ask before any command that changes production.

Free skills

incident-triage
The first 15 minutes of an incident: impact, what changed, mitigation, status updates, timeline.
k8s-debug
Pending, CrashLoopBackOff, OOMKilled, ImagePullBackOff, not-Ready pods, Services with no endpoints.
ci-failure
Red CI to a verdict (regression, flaky or infra) with evidence, then the fix.
postmortem
Blameless postmortems with owned, verifiable action items.
terraform-plan-review
Destroys, replacements, IAM widening and public exposure, with a go/no-go before you apply.
log-forensics
The first bad minute, new and spiking messages, and request correlation across services.

Pro pack

Eight deeper skills for teams running production: slo-design, alert-audit, cloud-cost-audit, postgres-incident, linux-perf, runbook-writer, oncall-handoff and dockerfile-review. Pay once and get lifetime updates.

Solo: $29 / £25 / €27 Team (up to 10): $99 / £79 / €89

Checkout and VAT/sales tax are handled by Polar, the merchant of record. The download is delivered instantly. Not happy within 14 days? Reply to your receipt for a refund.

Guides