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Jeffallan

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chaos-engineer

Designs chaos experiments, creates failure injection frameworks, and facilitates game day exercises for distributed systems — producing runbooks, experiment manifests, rollback procedures, and post-mortem templates. Use when designing chaos experiments, implementing failure injec

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Precio sin confirmar★ 11,280 Estrellas de GitHubRegistro actualizado · 2 sept 2026agent-skill

Resumen

Designs chaos experiments, creates failure injection frameworks, and facilitates game day exercises for distributed systems — producing runbooks, experiment manifests, rollback procedures, and post-mortem templates. Use when designing chaos experiments, implementing failure injection frameworks, or conducting game day exercises. Invoke for chaos experiments, resilience testing, blast radius control, game days, antifragile systems, fault injection, Chaos Monkey, Litmus Chaos.

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Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.

Chaos Engineer

When to Use This Skill

  • Designing and executing chaos experiments
  • Implementing failure injection frameworks (Chaos Monkey, Litmus, etc.)
  • Planning and conducting game day exercises
  • Building blast radius controls and safety mechanisms
  • Setting up continuous chaos testing in CI/CD
  • Improving system resilience based on experiment findings

Core Workflow

  1. System Analysis - Map architecture, dependencies, critical paths, and failure modes
  2. Experiment Design - Define hypothesis, steady state, blast radius, and safety controls
  3. Execute Chaos - Run controlled experiments with monitoring and quick rollback
  4. Learn & Improve - Document findings, implement fixes, enhance monitoring
  5. Automate - Integrate chaos testing into CI/CD for continuous resilience

Reference Guide

Load detailed guidance based on context:

TopicReferenceLoad When
Experimentsreferences/experiment-design.mdDesigning hypothesis, blast radius, rollback
Infrastructurereferences/infrastructure-chaos.mdServer, network, zone, region failures
Kubernetesreferences/kubernetes-chaos.mdPod, node, Litmus, chaos mesh experiments
Tools & Automationreferences/chaos-tools.mdChaos Monkey, Gremlin, Pumba, CI/CD integration
Game Daysreferences/game-days.mdPlanning, executing, learning from game days

Safety Checklist

Non-obvious constraints that must be enforced on every experiment:

  • Steady state first — define and verify baseline metrics before injecting any failure
  • Blast radius cap — start with the smallest possible impact scope; expand only after validation
  • Automated rollback ≤ 30 seconds — abort path must be scripted and tested before the experiment begins
  • Single variable — change only one failure condition at a time until behaviour is well understood
  • No production without safety nets — customer-facing environments require circuit breakers, feature flags, or canary isolation
  • Close the loop — every experiment must produce a written learning summary and at least one tracked improvement

Output Templates

When implementing chaos engineering, provide:

  1. Experiment design document (hypothesis, metrics, blast radius)
  2. Implementation code (failure injection scripts/manifests)
  3. Monitoring setup and alert configuration
  4. Rollback procedures and safety controls
  5. Learning summary and improvement recommendations

Concrete Example: Pod Failure Experiment (Litmus Chaos)

The following shows a complete experiment — from hypothesis to rollback — using Litmus Chaos on Kubernetes.

Step 1 — Define steady state and apply the experiment
# Verify baseline: p99 latency < 200ms, error rate < 0.1%
kubectl get deploy my-service -n production
kubectl top pods -n production -l app=my-service
Step 2 — Create and apply a Litmus ChaosEngine manifest
# chaos-pod-delete.yaml
apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: my-service-pod-delete
  namespace: production
spec:
  appinfo:
    appns: production
    applabel: "app=my-service"
    appkind: deployment
  # Limit blast radius: only 1 replica at a time
  engineState: active
  chaosServiceAccount: litmus-admin
  experiments:
    - name: pod-delete
      spec:
        components:
          env:
            - name: TOTAL_CHAOS_DURATION
              value: "60"          # seconds
            - name: CHAOS_INTERVAL
              value: "20"          # delete one pod every 20s
            - name: FORCE
              value: "false"
            - name: PODS_AFFECTED_PERC
              value: "33"          # max 33% of replicas affected

# Apply the experiment
kubectl apply -f chaos-pod-delete.yaml

# Watch experiment status
kubectl describe chaosengine my-service-pod-delete -n production
kubectl get chaosresult my-service-pod-delete-pod-delete -n production -w
Step 3 — Monitor during the experiment
# Tail application logs for errors
kubectl logs -l app=my-service -n production --since=2m -f

# Check ChaosResult verdict when complete
kubectl get chaosresult my-service-pod-delete-pod-delete \
  -n production -o jsonpath='{.status.experimentStatus.verdict}'
Step 4 — Rollback / abort if steady state is violated
# Immediately stop the experiment
kubectl patch chaosengine my-service-pod-delete \
  -n production --type merge -p '{"spec":{"engineState":"stop"}}'

# Confirm all pods are healthy
kubectl rollout status deployment/my-service -n production

Concrete Example: Network Latency with toxiproxy

# Install toxiproxy CLI
brew install toxiproxy   # macOS; use the binary release on Linux

# Start toxiproxy server (runs alongside your service)
toxiproxy-server &

# Create a proxy for your downstream dependency
toxiproxy-cli create -l 0.0.0.0:22222 -u downstream-db:5432 db-proxy

# Inject 300ms latency with 10% jitter — blast radius: this proxy only
toxiproxy-cli toxic add db-proxy -t latency -a latency=300 -a jitter=30

# Run your load test / observe metrics here ...

# Remove the toxic to restore normal behaviour
toxiproxy-cli toxic remove db-proxy -n latency_downstream

Concrete Example: Chaos Monkey (Spinnaker / standalone)

# chaos-monkey-config.yml — restrict to a single ASG
deployment:
  enabled: true
  regionIndependence: false
chaos:
  enabled: true
  meanTimeBetweenKillsInWorkDays: 2
  minTimeBetweenKillsInWorkDays: 1
  grouping: APP           # kill one instance per app, not per cluster
  exceptions:
    - account: production
      region: us-east-1
      detail: "*-canary"  # never kill canary instances

# Apply and trigger a manual kill for testing
chaos-monkey --app my-service --account staging --dry-run false

Documentation

Ver fuente ↗
Metadatos del archivo
name: chaos-engineer
description: Designs chaos experiments, creates failure injection frameworks, and facilitates game day exercises for distributed systems — producing runbooks, experiment manifests, rollback procedures, and post-mortem templates. Use when designing chaos experiments, implementing failure injection frameworks, or conducting game day exercises. Invoke for chaos experiments, resilience testing, blast radius control, game days, antifragile systems, fault injection, Chaos Monkey, Litmus Chaos.
license: MIT
metadata:
  author: https://github.com/Jeffallan
  version: "1.1.0"
  domain: devops
  triggers: chaos engineering, resilience testing, failure injection, game day, blast radius, chaos experiment, fault injection, Chaos Monkey, Litmus Chaos, antifragile
  role: specialist
  scope: implementation
  output-format: code
  related-skills: sre-engineer, devops-engineer, kubernetes-specialist
Ver texto original
---
name: chaos-engineer
description: Designs chaos experiments, creates failure injection frameworks, and facilitates game day exercises for distributed systems — producing runbooks, experiment manifests, rollback procedures, and post-mortem templates. Use when designing chaos experiments, implementing failure injection frameworks, or conducting game day exercises. Invoke for chaos experiments, resilience testing, blast radius control, game days, antifragile systems, fault injection, Chaos Monkey, Litmus Chaos.
license: MIT
metadata:
  author: https://github.com/Jeffallan
  version: "1.1.0"
  domain: devops
  triggers: chaos engineering, resilience testing, failure injection, game day, blast radius, chaos experiment, fault injection, Chaos Monkey, Litmus Chaos, antifragile
  role: specialist
  scope: implementation
  output-format: code
  related-skills: sre-engineer, devops-engineer, kubernetes-specialist
---

# Chaos Engineer

## When to Use This Skill

- Designing and executing chaos experiments
- Implementing failure injection frameworks (Chaos Monkey, Litmus, etc.)
- Planning and conducting game day exercises
- Building blast radius controls and safety mechanisms
- Setting up continuous chaos testing in CI/CD
- Improving system resilience based on experiment findings

## Core Workflow

1. **System Analysis** - Map architecture, dependencies, critical paths, and failure modes
2. **Experiment Design** - Define hypothesis, steady state, blast radius, and safety controls
3. **Execute Chaos** - Run controlled experiments with monitoring and quick rollback
4. **Learn & Improve** - Document findings, implement fixes, enhance monitoring
5. **Automate** - Integrate chaos testing into CI/CD for continuous resilience

## Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |
|-------|-----------|-----------|
| Experiments | `references/experiment-design.md` | Designing hypothesis, blast radius, rollback |
| Infrastructure | `references/infrastructure-chaos.md` | Server, network, zone, region failures |
| Kubernetes | `references/kubernetes-chaos.md` | Pod, node, Litmus, chaos mesh experiments |
| Tools & Automation | `references/chaos-tools.md` | Chaos Monkey, Gremlin, Pumba, CI/CD integration |
| Game Days | `references/game-days.md` | Planning, executing, learning from game days |

## Safety Checklist

Non-obvious constraints that must be enforced on every experiment:

- **Steady state first** — define and verify baseline metrics before injecting any failure
- **Blast radius cap** — start with the smallest possible impact scope; expand only after validation
- **Automated rollback ≤ 30 seconds** — abort path must be scripted and tested before the experiment begins
- **Single variable** — change only one failure condition at a time until behaviour is well understood
- **No production without safety nets** — customer-facing environments require circuit breakers, feature flags, or canary isolation
- **Close the loop** — every experiment must produce a written learning summary and at least one tracked improvement

## Output Templates

When implementing chaos engineering, provide:
1. Experiment design document (hypothesis, metrics, blast radius)
2. Implementation code (failure injection scripts/manifests)
3. Monitoring setup and alert configuration
4. Rollback procedures and safety controls
5. Learning summary and improvement recommendations

## Concrete Example: Pod Failure Experiment (Litmus Chaos)

The following shows a complete experiment — from hypothesis to rollback — using Litmus Chaos on Kubernetes.

### Step 1 — Define steady state and apply the experiment

```bash
# Verify baseline: p99 latency < 200ms, error rate < 0.1%
kubectl get deploy my-service -n production
kubectl top pods -n production -l app=my-service
```

### Step 2 — Create and apply a Litmus ChaosEngine manifest

```yaml
# chaos-pod-delete.yaml
apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: my-service-pod-delete
  namespace: production
spec:
  appinfo:
    appns: production
    applabel: "app=my-service"
    appkind: deployment
  # Limit blast radius: only 1 replica at a time
  engineState: active
  chaosServiceAccount: litmus-admin
  experiments:
    - name: pod-delete
      spec:
        components:
          env:
            - name: TOTAL_CHAOS_DURATION
              value: "60"          # seconds
            - name: CHAOS_INTERVAL
              value: "20"          # delete one pod every 20s
            - name: FORCE
              value: "false"
            - name: PODS_AFFECTED_PERC
              value: "33"          # max 33% of replicas affected
```

```bash
# Apply the experiment
kubectl apply -f chaos-pod-delete.yaml

# Watch experiment status
kubectl describe chaosengine my-service-pod-delete -n production
kubectl get chaosresult my-service-pod-delete-pod-delete -n production -w
```

### Step 3 — Monitor during the experiment

```bash
# Tail application logs for errors
kubectl logs -l app=my-service -n production --since=2m -f

# Check ChaosResult verdict when complete
kubectl get chaosresult my-service-pod-delete-pod-delete \
  -n production -o jsonpath='{.status.experimentStatus.verdict}'
```

### Step 4 — Rollback / abort if steady state is violated

```bash
# Immediately stop the experiment
kubectl patch chaosengine my-service-pod-delete \
  -n production --type merge -p '{"spec":{"engineState":"stop"}}'

# Confirm all pods are healthy
kubectl rollout status deployment/my-service -n production
```

## Concrete Example: Network Latency with toxiproxy

```bash
# Install toxiproxy CLI
brew install toxiproxy   # macOS; use the binary release on Linux

# Start toxiproxy server (runs alongside your service)
toxiproxy-server &

# Create a proxy for your downstream dependency
toxiproxy-cli create -l 0.0.0.0:22222 -u downstream-db:5432 db-proxy

# Inject 300ms latency with 10% jitter — blast radius: this proxy only
toxiproxy-cli toxic add db-proxy -t latency -a latency=300 -a jitter=30

# Run your load test / observe metrics here ...

# Remove the toxic to restore normal behaviour
toxiproxy-cli toxic remove db-proxy -n latency_downstream
```

## Concrete Example: Chaos Monkey (Spinnaker / standalone)

```bash
# chaos-monkey-config.yml — restrict to a single ASG
deployment:
  enabled: true
  regionIndependence: false
chaos:
  enabled: true
  meanTimeBetweenKillsInWorkDays: 2
  minTimeBetweenKillsInWorkDays: 1
  grouping: APP           # kill one instance per app, not per cluster
  exceptions:
    - account: production
      region: us-east-1
      detail: "*-canary"  # never kill canary instances

# Apply and trigger a manual kill for testing
chaos-monkey --app my-service --account staging --dry-run false
```

[Documentation](https://jeffallan.github.io/claude-skills/skills/devops/chaos-engineer/)

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Licencia: MIT

  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • Reference examples contain intentionally destructive commands (e.g., AWS instance termination, pod deletion, CPU injection); these are appropriate for chaos engineering but could be dangerous if copied without the skill's own safety checklist.
  • The SKILL.md excerpt appears to end mid-command in the monitoring example, so verify the full file is not truncated in the repository.
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
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Empieza con una tarea pequeña

  1. 1Lee la fuente y confirma entradas, resultados, dependencias y permisos.
  2. 2Pide un plan al agente. Aprueba la configuración y los costes antes de probar en un entorno aislado.
  3. 3Comprueba resultados y archivos modificados. Informa solo de lo ejecutado y conserva la revisión de la fuente.

Consulta dependencias, claves API y costes externos en la fuente. Un repositorio público no implica servicios gratuitos.

Fuente y notas de uso

Indexado

Los metadatos y revisiones son orientativos. Popularidad, descubrimiento y ejecución correcta son hechos distintos.

Repositorio fuente
Jeffallan/claude-skills
Licencia
MIT
Versión
1.0.0
Último push de GitHub
7 ago 2026
Registro actualizado
2 sept 2026
Ruta de instrucciones
skills/chaos-engineer/SKILL.md @ 882ef55e377d

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

85/100

Excelente

Confianza

64/100

Solo sandbox

Auditoría

80/100

Requiere revisión

Abrir auditoría completaVer informe de evaluación
  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • Reference examples contain intentionally destructive commands (e.g., AWS instance termination, pod deletion, CPU injection); these are appropriate for chaos engineering but could be dangerous if copied without the skill's own safety checklist.
  • The SKILL.md excerpt appears to end mid-command in the monitoring example, so verify the full file is not truncated in the repository.
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
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    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 80,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Reference examples contain intentionally destructive commands (e.g., AWS instance termination, pod deletion, CPU injection); these are appropriate for chaos engineering but could be dangerous if copied without the skill's own safety checklist.",
      "The SKILL.md excerpt appears to end mid-command in the monitoring example, so verify the full file is not truncated in the repository.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 85,
    "label": "Excellent"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Coding agents",
    "maintenance": "2mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "Reference examples contain intentionally destructive commands (e.g., AWS instance termination, pod deletion, CPU injection); these are appropriate for chaos engineering but could be dangerous if copied without the skill's own safety checklist.",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "The SKILL.md excerpt appears to end mid-command in the monitoring example, so verify the full file is not truncated in the repository.",
    "Quality score needs review"
  ],
  "agent_contract": {
    "task_input": "Use chaos-engineer in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 72/100 Strong shortlist",
      "Audit: 80/100 Needs review",
      "Safety: 40/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "jeffallan-chaos-engineer (chaos-engineer)",
      "install_command": "npx skills add Jeffallan/claude-skills --skill chaos-engineer",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "jeffallan-chaos-engineer",
      "task": "Use chaos-engineer in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/jeffallan-chaos-engineer",
    "api": "https://www.openagentskill.com/api/agent/skills/jeffallan-chaos-engineer",
    "audit": "https://www.openagentskill.com/skills/jeffallan-chaos-engineer/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=jeffallan-chaos-engineer&task=Use%20chaos-engineer%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20chaos-engineer%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20chaos-engineer%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/jeffallan-chaos-engineer/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/jeffallan-chaos-engineer"
  }
}

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Creador
Jeffallan
Indexado por
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