AWS Cost Optimizer Agent Skill

by lingxling

Comprehensive AWS cost analysis and optimization recommendations using AWS CLI and Cost Explorer

1.6k tokens

context cost

SKILL.md, read when the skill is used

files

instructions only

copies elsewhere

how many repositories repackaged it

223

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/lingxling/awesome-skills-cn --skill aws-cost-optimizer

The instruction itself

15 sections, as written by the author

AWS Cost Optimizer

Analyze AWS spending patterns, identify waste, and provide actionable cost reduction strategies.

When to Use This Skill

Use this skill when you need to analyze AWS spending, identify cost optimization opportunities, or reduce cloud waste.

Core Capabilities

Cost Analysis

Parse AWS Cost Explorer data for trends and anomalies
Break down costs by service, region, and resource tags
Identify month-over-month spending increases

Resource Optimization

Detect idle EC2 instances (low CPU utilization)
Find unattached EBS volumes and old snapshots
Identify unused Elastic IPs
Locate underutilized RDS instances
Find old S3 objects eligible for lifecycle policies

Savings Recommendations

Suggest Reserved Instance/Savings Plans opportunities
Recommend instance rightsizing based on CloudWatch metrics
Identify resources in expensive regions
Calculate potential savings with specific actions

AWS CLI Commands

Get Cost and Usage

# Last 30 days cost by service
aws ce get-cost-and-usage \
  --time-period Start=$(date -d '30 days ago' +%Y-%m-%d),End=$(date +%Y-%m-%d) \
  --granularity MONTHLY \
  --metrics BlendedCost \
  --group-by Type=DIMENSION,Key=SERVICE

# Daily costs for current month
aws ce get-cost-and-usage \
  --time-period Start=$(date +%Y-%m-01),End=$(date +%Y-%m-%d) \
  --granularity DAILY \
  --metrics UnblendedCost

Find Unused Resources

# Unattached EBS volumes
aws ec2 describe-volumes \
  --filters Name=status,Values=available \
  --query 'Volumes[*].[VolumeId,Size,VolumeType,CreateTime]' \
  --output table

# Unused Elastic IPs
aws ec2 describe-addresses \
  --query 'Addresses[?AssociationId==null].[PublicIp,AllocationId]' \
  --output table

# Idle EC2 instances (requires CloudWatch)
aws cloudwatch get-metric-statistics \
  --namespace AWS/EC2 \
  --metric-name CPUUtilization \
  --dimensions Name=InstanceId,Value=i-xxxxx \
  --start-time $(date -u -d '7 days ago' +%Y-%m-%dT%H:%M:%S) \
  --end-time $(date -u +%Y-%m-%dT%H:%M:%S) \
  --period 86400 \
  --statistics Average

# Old EBS snapshots (>90 days)
aws ec2 describe-snapshots \
  --owner-ids self \
  --query 'Snapshots[?StartTime<=`'$(date -d '90 days ago' --iso-8601)'`].[SnapshotId,StartTime,VolumeSize]' \
  --output table

Rightsizing Analysis

# List EC2 instances with their types
aws ec2 describe-instances \
  --query 'Reservations[*].Instances[*].[InstanceId,InstanceType,State.Name,Tags[?Key==`Name`].Value|[0]]' \
  --output table

# Get RDS instance utilization
aws cloudwatch get-metric-statistics \
  --namespace AWS/RDS \
  --metric-name CPUUtilization \
  --dimensions Name=DBInstanceIdentifier,Value=mydb \
  --start-time $(date -u -d '30 days ago' +%Y-%m-%dT%H:%M:%S) \
  --end-time $(date -u +%Y-%m-%dT%H:%M:%S) \
  --period 86400 \
  --statistics Average,Maximum

Optimization Workflow

Baseline Assessment
Pull 3-6 months of cost data
Identify top 5 spending services
Calculate growth rate

Quick Wins
Delete unattached EBS volumes
Release unused Elastic IPs
Stop/terminate idle EC2 instances
Delete old snapshots

Strategic Optimization
Analyze Reserved Instance coverage
Review instance types vs. workload
Implement S3 lifecycle policies
Consider Spot instances for non-critical workloads

Ongoing Monitoring
Set up AWS Budgets with alerts
Enable Cost Anomaly Detection
Tag resources for cost allocation
Monthly cost review meetings

Cost Optimization Checklist

[ ] Enable AWS Cost Explorer
[ ] Set up cost allocation tags
[ ] Create AWS Budget with alerts
[ ] Review and delete unused resources
[ ] Analyze Reserved Instance opportunities
[ ] Implement S3 Intelligent-Tiering
[ ] Review data transfer costs
[ ] Optimize Lambda memory allocation
[ ] Use CloudWatch Logs retention policies
[ ] Consider multi-region cost differences

Example Prompts

Analysis

"Show me AWS costs for the last 3 months broken down by service"
"What are my top 10 most expensive resources?"
"Compare this month's spending to last month"

Optimization

"Find all unattached EBS volumes and calculate savings"
"Identify EC2 instances with <5% CPU utilization"
"Suggest Reserved Instance purchases based on usage"
"Calculate savings from deleting snapshots older than 90 days"

Implementation

"Create a script to delete unattached volumes"
"Set up a budget alert for $1000/month"
"Generate a cost optimization report for leadership"

Best Practices

Always test in non-production first
Verify resources are truly unused before deletion
Document all cost optimization actions
Calculate ROI for optimization efforts
Automate recurring optimization tasks
Use AWS Trusted Advisor recommendations
Enable AWS Cost Anomaly Detection

Integration with Kiro CLI

This skill works seamlessly with Kiro CLI's AWS integration:

# Use Kiro to analyze costs
kiro-cli chat "Use aws-cost-optimizer to analyze my spending"

# Generate optimization report
kiro-cli chat "Create a cost optimization plan using aws-cost-optimizer"

Safety Notes

Risk Level: Low - Read-only analysis is safe
Deletion Actions: Medium Risk - Always verify before deleting resources
Production Changes: High Risk - Test rightsizing in dev/staging first
Maintain backups before any deletion
Use --dry-run flag when available

Additional Resources

Limitations

Use this skill only when the task clearly matches the scope described above.
Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

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How to use it

Copy the folder

Take lingxling/aws-cost-optimizer from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

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