AWS | Amazon Web Services

Setup

On first use, read setup.md for integration options. The skill works immediately — setup is optional for personalization.

When to Use

User needs AWS infrastructure guidance. Agent handles architecture decisions, service selection, cost optimization, security hardening, and deployment patterns.

Architecture

Memory lives in ~/aws/. See memory-template.md for structure.

~/aws/
├── memory.md        # Account context + preferences
├── resources.md     # Active infrastructure inventory
└── costs.md         # Cost tracking + alerts

Quick Reference

| Topic | File | |-------|------| | Setup process | setup.md | | Memory template | memory-template.md | | Service patterns | services.md | | Cost optimization | costs.md | | Security hardening | security.md |

Core Rules

1. Verify Account Context First

Before any operation, confirm:

• Region (default: us-east-1, but ask)
• Account type (personal/startup/enterprise)
• Existing infrastructure (VPC, subnets, security groups)

aws sts get-caller-identity
aws ec2 describe-vpcs --query 'Vpcs[].{ID:VpcId,CIDR:CidrBlock,Default:IsDefault}'

2. Cost-First Architecture

Every recommendation includes cost impact:

| Stage | Recommended Stack | Monthly Cost | |-------|-------------------|--------------| | MVP (<1k users) | Single EC2 + RDS | ~$50 | | Growth (1-10k) | ALB + ASG + RDS Multi-AZ | ~$200 | | Scale (10k+) | ECS/EKS + Aurora + ElastiCache | ~$500+ |

Default to smallest viable instance. Scaling up is easy; scaling down wastes money.

3. Security by Default

Every resource includes:

• Principle of least privilege IAM
• Encryption at rest (KMS default key minimum)
• VPC isolation (no public subnets for databases)
• Security groups with explicit deny-all inbound

4. Infrastructure as Code

Generate Terraform or CloudFormation for reproducibility:

# Prefer Terraform for multi-cloud portability
terraform init && terraform plan

Never rely on console-only changes.

5. Tagging Strategy

Every resource gets tagged for cost allocation:

--tags Key=Environment,Value=prod Key=Project,Value=myapp Key=Owner,Value=team

6. Monitoring from Day 1

Deploy CloudWatch alarms with infrastructure:

• Billing alerts (before you get surprised)
• CPU/Memory thresholds
• Error rate spikes

Cost Traps

NAT Gateway data processing ($0.045/GB): VPC endpoints are free for S3/DynamoDB. A busy app can burn $500/month on NAT alone.

aws ec2 create-vpc-endpoint --vpc-id vpc-xxx \
  --service-name com.amazonaws.us-east-1.s3 --route-table-ids rtb-xxx

EBS snapshots accumulate forever: Automated backups create snapshots that never delete. Set lifecycle policies.

aws ec2 describe-snapshots --owner-ids self \
  --query 'Snapshots[?StartTime<=`2024-01-01`].[SnapshotId,StartTime,VolumeSize]'

CloudWatch Logs default retention is forever:

aws logs put-retention-policy --log-group-name /aws/lambda/fn --retention-in-days 14

Idle load balancers cost $16/month minimum: ALBs charge even with zero traffic. Delete unused ones.

Data transfer between AZs costs $0.01/GB each way: Chatty microservices across AZs add up fast. Co-locate when possible.

Security Traps

S3 bucket policies override ACLs: Console shows ACL as "private" but a bucket policy can still expose everything.

aws s3api get-bucket-policy --bucket my-bucket 2>/dev/null || echo "No policy"
aws s3api get-public-access-block --bucket my-bucket

Default VPC security groups allow all outbound: Attackers exfiltrate through outbound. Restrict it.

IAM users with console access + programmatic access: Credentials in code get leaked. Use roles + temporary credentials.

RDS publicly accessible defaults to Yes in console: Always verify:

aws rds describe-db-instances --query 'DBInstances[].{ID:DBInstanceIdentifier,Public:PubliclyAccessible}'

Performance Patterns

Lambda cold starts:

• Use provisioned concurrency for latency-sensitive functions
• Keep packages small (<50MB unzipped)
• Initialize SDK clients outside handler

RDS connection limits: | Instance | Max Connections | |----------|-----------------| | db.t3.micro | 66 | | db.t3.small | 150 | | db.t3.medium | 300 |

Use RDS Proxy for Lambda to avoid connection exhaustion.

EBS volume types: | Type | Use Case | IOPS | |------|----------|------| | gp3 | Default (consistent) | 3,000 base | | io2 | Databases (guaranteed) | Up to 64,000 | | st1 | Big data (throughput) | 500 MiB/s |

Service Selection

| Need | Service | Why | |------|---------|-----| | Static site | S3 + CloudFront | Pennies/month, global CDN | | API backend | Lambda + API Gateway | Zero idle cost | | Container app | ECS Fargate | No cluster management | | Database | RDS PostgreSQL | Managed, Multi-AZ ready | | Cache | ElastiCache Redis | Session/cache, < DynamoDB latency | | Queue | SQS | Simpler than SNS for most cases | | Search | OpenSearch | Elasticsearch managed |

CLI Essentials

# Configure credentials
aws configure --profile myproject

# Always specify profile
export AWS_PROFILE=myproject

# Check current identity
aws sts get-caller-identity

# List all regions
aws ec2 describe-regions --query 'Regions[].RegionName'

# Estimate monthly cost
aws ce get-cost-forecast --time-period Start=$(date +%Y-%m-01),End=$(date -v+1m +%Y-%m-01) \
  --metric UNBLENDED_COST --granularity MONTHLY

Security & Privacy

Credentials: This skill uses the AWS CLI, which reads credentials from ~/.aws/credentials or environment variables. The skill never stores, logs, or transmits AWS credentials.

Local storage: Preferences and context stored in ~/aws/ — no data leaves your machine.

CLI commands: All commands shown are read-only by default. Destructive operations (delete, terminate) require explicit user confirmation.

Related Skills

Install with clawhub install <slug> if user confirms:

• infrastructure — architecture decisions
• cloud — multi-cloud patterns
• docker — container basics
• backend — API design

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