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News, tutorials, and release notes from LocalStack — the local cloud development platform for AWS, Snowflake, and more.

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Testing Cognito Authentication Flows Locally with LocalStack

Learn how to build and test Cognito flows against LocalStack: the hosted UI with auth code and PKCE, JWT verification against the pool's JWKS in an API Gateway authorizer, TOTP multi-factor auth, and machine-to-machine tokens from the client credentials grant.

CognitoAuthentication

Give Your AI Agent an Undo Button for AWS State

We gave Claude Code the LocalStack MCP server and a real AWS CDK app, then made a one-line change that looked harmless, which then silently destroyed the data on deployment. The agent caught it, rolled back to a Cloud Pod, and we fixed it forward, all through the MCP server.

Testing Lambda Durable Functions Locally with LocalStack

Learn how to build and test Lambda Durable Functions locally with LocalStack by deploying an order processing workflow with CDK, watching checkpointed steps retry a flaky payment gateway, surviving a restart mid-execution, and resuming the workflow with a callback.

LambdaDurable Functions

Introducing Application Emulators via WonderTwin AI: The Path to Emulating the World's Software

Learn about LocalStack's acquisition of WonderTwin AI and how application emulation enables agentic full-stack emulation for AI-native software development.

WonderTwin AIEmulation

Ask Your AI Agent to Break Your Cloud App

We asked Claude Code to run a chaos game day against a serverless data pipeline on LocalStack: define a steady state, inject faults into every hop, diagnose the failures from App Inspector traces, fix the pipeline, and prove the fix by replaying the same faults.

Chaos EngineeringAI Agents

Meet lstk: A Better Way to Use LocalStack from the CLI

Meet lstk, the new recommended LocalStack CLI. One install replaces the localstack CLI, awslocal, and Python dependencies, with browser-based login, unified snapshot management, TOML config, and the same commands in local development and CI/CD.

Beyond Bluesky: Building an AT Protocol Event Pipeline on AWS

AT Protocol is more than just Bluesky. This post explains what ATproto is, why it matters for event-driven apps, and how to build a reusable AWS pipeline for consuming it — including testing the full stack on LocalStack before touching a real account.

Announcing the LocalStack for Snowflake 2026.08.0 Release

Snowflake-Next enters preview, while LocalStack for Snowflake 2026.08.0 improves long-running query handling, RESULT_SCAN, ordered aggregates, metadata queries, pipes, and tags.

releaseannouncement

Stop Prompting Your AI Agent: Build an AWS Development System Instead

Stop writing bigger and bigger prompts for your AI coding agent. Learn how to build an AI-native AWS development environment using Cursor Rules, agent skills and plugins, the AWS MCP Server, and LocalStack so your agent has what it needs to build, test, and debug AWS applications locally before touching a real cloud account.

Announcing the LocalStack for AWS 2026.08.0 Release

LocalStack for AWS 2026.08.0 adds Lambda Durable Functions, CloudFront Functions with KeyValueStore, the native ELBv2 provider by default, broader Verified Permissions and RDS coverage, OpenSearch 3.7, and CloudFormation update support for more AWS resource types.

releaseannouncement

How to Test AWS Fargate Container Workloads Locally with LocalStack

Learn how to test AWS Fargate container workloads locally with LocalStack by deploying a CDK stack that runs a message-driven Go app on ECS Fargate, processing SQS messages into DynamoDB, and validating the full flow with integration tests.

FargateContainers

Using AWS's Official MCP Servers with LocalStack

AWS ships a fleet of official MCP servers that let agents write IaC, validate it, and invoke Lambda functions. Point them at LocalStack instead of real AWS, and an agent can build, harden, deploy, and test the cloud app locally. Here is how we wired them up and what happened.