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AWS SDK Swift Usage

AWSOfficialPublished by AWS

  • Skill
  • Tool integration
  • Cloud and DevOps
  • Apache-2.0
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From the author

AWS SDK for Swift development patterns. Use when writing Swift code that uses AWS services via aws-sdk-swift package.
— the description by AWS

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides essential development patterns and code structures for integrating AWS services into Swift applications using the aws-sdk-swift package. It covers client initialization, configuration management, credential handling, and common service operations including pagination, waiters, and presigned URLs.

What it does

  • Defines patterns for initializing AWS service clients using struct-based configurations.
  • Provides examples for managing AWS credentials using static resolvers or role assumption.
  • Demonstrates how to perform common operations like object storage interactions.
  • Outlines the implementation of waiters and paginated requests for AWS services.
  • Shows how to generate presigned URLs for secure resource access.
  • Explains the required async code structure for SDK operations.

When to use it

  • When developing Swift applications that require integration with AWS services.
  • When you need to configure service clients with custom endpoints or retry strategies.
  • When implementing pagination or waiting for resource states in AWS.
  • When setting up custom credential resolution for AWS authentication.

Advantages

  • Provides clear guidance on using current struct-based configuration types.
  • Ensures correct parameter ordering for client configurations.
  • Standardizes the approach to async operations within the SDK.
  • Offers ready-to-use patterns for common AWS tasks like file uploads and listing resources.

Usage examples

“How do I initialize an S3 client in Swift with a specific region?”
The agent provides the code to instantiate an S3Client using the S3ClientConfig struct with the required region parameter.
“Show me how to use pagination for listing S3 objects.”
The agent provides a Swift code snippet using the listObjectsV2Paginated method with an async for-loop to iterate through pages.
“How do I assume an IAM role using the AWS SDK for Swift?”
The agent provides an example using STSAssumeRoleAWSCredentialIdentityResolver to configure a client with assumed role credentials.
“How do I wait for a bucket to exist in S3?”
The agent provides the syntax for using the waitUntilBucketExists method along with the required WaiterOptions.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/aws/aws-sdk-swift-usage/download

  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip aws-sdk-swift-usage.zip -d .agents/skills

Documentation by AWS

AWS SDK for Swift

Async Code Structure

All SDK operations are async. Use @main entry point:

@main
struct Main {
    static func main() async throws {
        let client = try await S3Client()
        // ... async operations
    }
}

CRITICAL: Use Struct Config Types

NEVER use S3ClientConfiguration or DynamoDBClientConfiguration - these are DEPRECATED classes.

ALWAYS use the struct-based config types:

  • S3Client.S3ClientConfig (not S3ClientConfiguration)

  • DynamoDBClient.DynamoDBClientConfig (not DynamoDBClientConfiguration)

  • STSClient.STSClientConfig (not STSClientConfiguration)

Config parameters MUST be in declaration order. Region is ALWAYS required when creating a config. Check the service client source for exact order.

// CORRECT - struct config
let config = try await S3Client.S3ClientConfig(region: "us-west-2")
let client = S3Client(config: config)

// WRONG - deprecated class
// let config = try await S3Client.S3ClientConfiguration(region: "us-west-2")

Client Creation

All service clients follow the same pattern: <Service>Client with <Service>Client.<Service>ClientConfig.

Model types (structs/enums used in requests/responses) are namespaced under <Service>ClientTypes:

  • S3ClientTypes.Bucket, S3ClientTypes.Object

  • DynamoDBClientTypes.AttributeValue

  • CloudWatchClientTypes.MetricDatum, CloudWatchClientTypes.Dimension

import AWSS3
import AWSDynamoDB

// Simple - auto-detects region
let s3 = try await S3Client()
let dynamo = try await DynamoDBClient()

// With region
let s3 = try S3Client(region: "us-west-2")

// With config - parameters must be in declaration order
let config = try await S3Client.S3ClientConfig(
    useFIPS: true,
    awsRetryMode: .adaptive,
    maxAttempts: 5,
    region: "us-west-2"
)
let client = S3Client(config: config)

// With custom endpoint and credentials
let config = try await S3Client.S3ClientConfig(
    awsCredentialIdentityResolver: resolver,
    region: "us-west-2",
    endpoint: "https://s3.custom-endpoint.com"
)

Common config parameters (MUST follow declaration order):

  • awsCredentialIdentityResolver - Custom credentials

  • useFIPS - Enable FIPS endpoints

  • useDualStack - Enable dual-stack endpoints

  • awsRetryMode - Retry strategy (.adaptive, .standard, .legacy)

  • maxAttempts - Max retry attempts

  • region - AWS region

  • httpClientEngine - Custom HTTP client (requires HttpClientConfiguration parameter):

    import ClientRuntime
let httpConfig = HttpClientConfiguration()
let httpClient = URLSessionHTTPClient(httpClientConfiguration: httpConfig)
let config = try await S3Client.S3ClientConfig(
    region: "us-east-1",
    httpClientEngine: httpClient
)

  • endpoint - Custom endpoint URL

For service-specific config options or exact parameter order, check Sources/Services/AWS<Service>/Sources/AWS<Service>/<Service>Client.swift in the SDK.

Credential Resolvers

import AWSSDKIdentity
import SmithyIdentity

// Static credentials - pass credential object directly
let creds = AWSCredentialIdentity(accessKey: "AKIA...", secret: "...")
let resolver = StaticAWSCredentialIdentityResolver(creds)

// Assume role - REQUIRES underlying resolver
let underlying = try DefaultAWSCredentialIdentityResolverChain()
let resolver = try STSAssumeRoleAWSCredentialIdentityResolver(
    awsCredentialIdentityResolver: underlying,
    roleArn: "arn:aws:iam::123456789012:role/MyRole",
    sessionName: "session-name"
)

// Use in config
let config = try await S3Client.S3ClientConfig(
    awsCredentialIdentityResolver: resolver,
    region: "us-west-2"
)

Waiters

Import SmithyWaitersAPI. WaiterOptions requires maxWaitTime parameter:

import AWSS3
import SmithyWaitersAPI

let client = try await S3Client()
_ = try await client.waitUntilBucketExists(
    options: WaiterOptions(maxWaitTime: 120.0),
    input: HeadBucketInput(bucket: "my-bucket")
)

Pagination

let input = ListObjectsV2Input(bucket: "my-bucket")
for try await page in client.listObjectsV2Paginated(input: input) {
    for object in page.contents ?? [] {
        print(object.key ?? "")
    }
}

Presigned URLs

let url = try await client.presignedURLForGetObject(
    input: GetObjectInput(bucket: "my-bucket", key: "file.pdf"),
    expiration: 3600
)

Common Operations

// Put object
_ = try await client.putObject(input: PutObjectInput(
    body: .data(data),
    bucket: "bucket",
    key: "key"
))

// Get object
let output = try await client.getObject(input: GetObjectInput(bucket: "bucket", key: "key"))
let data = try await output.body?.readData()

// List buckets
let response = try await client.listBuckets(input: ListBucketsInput())
for bucket in response.buckets ?? [] {
    print(bucket.name ?? "")
}

Files

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Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

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Attribution and licence

Published by
AWS
Publisher
AWS (Official)
Source
aws/agent-toolkit-for-aws · skills/core-skills/aws-sdk-swift-usage · commit 0a218f8
Licence
Apache License 2.0 (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • NOTICE (added by AutoGineer from NOTICE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced
Also distributed in
aws/agent-toolkit-for-aws

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