itsmostafa/aws-agent-skills/itsmostafa-s3

Name: itsmostafa-s3
Author: itsmostafa

Trust tier 3

community
ext:[{"type":"config","description":"Configuration overrides"}]

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AWS S3 object storage for bucket management, object operations, and access control. Use when creating buckets, uploading files, configuring lifecycle policies, setting up static websites, managing permissions, or implementing cross-region replication.

Install

npx vskill@latest install itsmostafa/aws-agent-skills/itsmostafa-s3

Semi-extensibleMentions customization, but needs skill-specific knowledge. Read the extensible skills standard

SKILL.md

AWS S3

Amazon Simple Storage Service (S3) provides scalable object storage with industry-leading durability (99.999999999%). S3 is fundamental to AWS—used for data lakes, backups, static websites, and as storage for many other AWS services.

Core Concepts
Common Patterns
CLI Reference
Best Practices
Troubleshooting
References

Core Concepts

Buckets

Containers for objects. Bucket names are globally unique across all AWS accounts.

Objects

Files stored in S3, consisting of data, metadata, and a unique key (path). Maximum size: 5 TB.

Storage Classes

Class	Use Case	Durability	Availability
Standard	Frequently accessed	99.999999999%	99.99%
Intelligent-Tiering	Unknown access patterns	99.999999999%	99.9%
Standard-IA	Infrequent access	99.999999999%	99.9%
Glacier Instant	Archive with instant retrieval	99.999999999%	99.9%
Glacier Flexible	Archive (minutes to hours)	99.999999999%	99.99%
Glacier Deep Archive	Long-term archive	99.999999999%	99.99%

Versioning

Keeps multiple versions of an object. Essential for data protection and recovery.

Common Patterns

Create a Bucket with Best Practices

AWS CLI:

bash

# Create bucket (us-east-1 doesn't need LocationConstraint)
aws s3api create-bucket \
  --bucket my-secure-bucket-12345 \
  --region us-west-2 \
  --create-bucket-configuration LocationConstraint=us-west-2
 
# Enable versioning
aws s3api put-bucket-versioning \
  --bucket my-secure-bucket-12345 \
  --versioning-configuration Status=Enabled
 
# Block public access
aws s3api put-public-access-block \
  --bucket my-secure-bucket-12345 \
  --public-access-block-configuration \
    BlockPublicAcls=true,IgnorePublicAcls=true,BlockPublicPolicy=true,RestrictPublicBuckets=true
 
# Enable encryption
aws s3api put-bucket-encryption \
  --bucket my-secure-bucket-12345 \
  --server-side-encryption-configuration '{
    "Rules": [{"ApplyServerSideEncryptionByDefault": {"SSEAlgorithm": "AES256"}}]
  }'

boto3:

python

import boto3
s3 = boto3.client('s3', region_name='us-west-2')
# Create bucket
s3.create_bucket(
    Bucket='my-secure-bucket-12345',
    CreateBucketConfiguration={'LocationConstraint': 'us-west-2'}
)
# Enable versioning
s3.put_bucket_versioning(
    Bucket='my-secure-bucket-12345',
    VersioningConfiguration={'Status': 'Enabled'}
)
# Block public access
s3.put_public_access_block(
    Bucket='my-secure-bucket-12345',
    PublicAccessBlockConfiguration={
        'BlockPublicAcls': True,
        'IgnorePublicAcls': True,
        'BlockPublicPolicy': True,
        'RestrictPublicBuckets': True
    }
)

Upload and Download Objects

bash

# Upload a single file
aws s3 cp myfile.txt s3://my-bucket/path/myfile.txt
 
# Upload with metadata
aws s3 cp myfile.txt s3://my-bucket/path/myfile.txt \
  --metadata "environment=production,version=1.0"
 
# Download a file
aws s3 cp s3://my-bucket/path/myfile.txt ./myfile.txt
 
# Sync a directory
aws s3 sync ./local-folder s3://my-bucket/prefix/ --delete
 
# Copy between buckets
aws s3 cp s3://source-bucket/file.txt s3://dest-bucket/file.txt

Generate Presigned URL

python

import boto3
from botocore.config import Config
s3 = boto3.client('s3', config=Config(signature_version='s3v4'))
# Generate presigned URL for download (GET)
url = s3.generate_presigned_url(
    'get_object',
    Params={'Bucket': 'my-bucket', 'Key': 'path/to/file.txt'},
    ExpiresIn=3600  # URL valid for 1 hour
)
# Generate presigned URL for upload (PUT)
upload_url = s3.generate_presigned_url(
    'put_object',
    Params={
        'Bucket': 'my-bucket',
        'Key': 'uploads/newfile.txt',
        'ContentType': 'text/plain'
    },
    ExpiresIn=3600
)

Configure Lifecycle Policy

bash

cat > lifecycle.json << 'EOF'
{
  "Rules": [
    {
      "ID": "MoveToGlacierAfter90Days",
      "Status": "Enabled",
      "Filter": {"Prefix": "logs/"},
      "Transitions": [
        {"Days": 90, "StorageClass": "GLACIER"}
      ],
      "Expiration": {"Days": 365}
    },
    {
      "ID": "DeleteOldVersions",
      "Status": "Enabled",
      "Filter": {},
      "NoncurrentVersionExpiration": {"NoncurrentDays": 30}
    }
  ]
}
EOF
 
aws s3api put-bucket-lifecycle-configuration \
  --bucket my-bucket \
  --lifecycle-configuration file://lifecycle.json

Event Notifications to Lambda

bash

aws s3api put-bucket-notification-configuration \
  --bucket my-bucket \
  --notification-configuration '{
    "LambdaFunctionConfigurations": [
      {
        "LambdaFunctionArn": "arn:aws:lambda:us-east-1:123456789012:function:ProcessS3Upload",
        "Events": ["s3:ObjectCreated:*"],
        "Filter": {
          "Key": {
            "FilterRules": [
              {"Name": "prefix", "Value": "uploads/"},
              {"Name": "suffix", "Value": ".jpg"}
            ]
          }
        }
      }
    ]
  }'

CLI Reference

High-Level Commands (aws s3)

Command	Description
`aws s3 ls`	List buckets or objects
`aws s3 cp`	Copy files
`aws s3 mv`	Move files
`aws s3 rm`	Delete files
`aws s3 sync`	Sync directories
`aws s3 mb`	Make bucket
`aws s3 rb`	Remove bucket

Low-Level Commands (aws s3api)

Command	Description
`aws s3api create-bucket`	Create bucket with options
`aws s3api put-object`	Upload with full control
`aws s3api get-object`	Download with options
`aws s3api delete-object`	Delete single object
`aws s3api put-bucket-policy`	Set bucket policy
`aws s3api put-bucket-versioning`	Enable versioning
`aws s3api list-object-versions`	List all versions

Useful Flags

--recursive: Process all objects in prefix
--exclude/--include: Filter objects
--dryrun: Preview changes
--storage-class: Set storage class
--acl: Set access control (prefer policies instead)

Best Practices

Security

Block public access at account and bucket level
Enable versioning for data protection
Use bucket policies over ACLs
Enable encryption (SSE-S3 or SSE-KMS)
Enable access logging for audit
Use VPC endpoints for private access
Enable MFA Delete for critical buckets

Performance

Use Transfer Acceleration for distant uploads
Use multipart upload for files > 100 MB
Randomize key prefixes for high-throughput (less relevant with 2024 improvements)
Use byte-range fetches for large file downloads

Cost Optimization

Use lifecycle policies to transition to cheaper storage
Enable Intelligent-Tiering for unpredictable access
Delete incomplete multipart uploads:

``json { "Rules": [{ "ID": "AbortIncompleteMultipartUpload", "Status": "Enabled", "Filter": {}, "AbortIncompleteMultipartUpload": {"DaysAfterInitiation": 7} }] } ``

Use S3 Storage Lens to analyze storage patterns

Troubleshooting

Access Denied Errors

Causes:

Bucket policy denies access
IAM policy missing permissions
Public access block preventing access
Object owned by different account
VPC endpoint policy blocking

Debug steps:

bash

# Check your identity
aws sts get-caller-identity
 
# Check bucket policy
aws s3api get-bucket-policy --bucket my-bucket
 
# Check public access block
aws s3api get-public-access-block --bucket my-bucket
 
# Check object ownership
aws s3api get-object-attributes \
  --bucket my-bucket \
  --key myfile.txt \
  --object-attributes ObjectOwner

CORS Errors

Symptom: Browser blocks cross-origin request

Fix:

bash

aws s3api put-bucket-cors --bucket my-bucket --cors-configuration '{
  "CORSRules": [{
    "AllowedOrigins": ["https://myapp.com"],
    "AllowedMethods": ["GET", "PUT", "POST"],
    "AllowedHeaders": ["*"],
    "ExposeHeaders": ["ETag"],
    "MaxAgeSeconds": 3600
  }]
}'

Slow Uploads

Solutions:

Use multipart upload for large files
Enable Transfer Acceleration
Use aws s3 cp with --expected-size for large files
Check network throughput to the region

403 on Presigned URL

Causes:

URL expired
Signer lacks permissions
Bucket policy blocks access
Region mismatch (v4 signatures are region-specific)

Fix: Ensure signer has permissions and use correct region.

References

Security

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Model reviewPassed

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Quality evaluation

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Source

SKILL.md in the repositoryCheckingskills/s3/SKILL.md

Popularity

Repository stars: 1,085
Repository forks: 438
7-day trend score: 35

Stars and forks are for the whole GitHub repository, not this skill alone. Refreshed 2 May 2026, 5 months ago.

Extension points

configConfiguration overrides

Learn the extensible skills standard

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Install

SKILL.md

AWS S3

Table of Contents

Core Concepts

Buckets

Objects

Storage Classes

Versioning

Common Patterns

Create a Bucket with Best Practices

Upload and Download Objects

Generate Presigned URL

Configure Lifecycle Policy

Event Notifications to Lambda

CLI Reference

High-Level Commands (aws s3)

Low-Level Commands (aws s3api)

Useful Flags

Best Practices

Security

Performance

Cost Optimization

Troubleshooting

Access Denied Errors

CORS Errors

Slow Uploads

403 on Presigned URL

References

Security

Quality evaluation

Source

Popularity

Extension points

Works with