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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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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.

Give Your Coding Agent a Real Cloud to Break

We gave Claude Code the LocalStack MCP server and a production bug report about a broken dead-letter queue, then watched it deploy, reproduce the failure from App Inspector traces, fix the pipeline, and prove the fix, without touching an AWS account.

LocalStack as an AI Sandbox

AI agents are getting capable enough to provision infrastructure and execute code with real consequences. Here's a taxonomy of AI sandboxes and where LocalStack fits as the missing cloud infrastructure layer.

Testing AWS Service Control Policies Locally with LocalStack

Learn how to test Service Control Policies with LocalStack by building a local AWS organization, attaching guardrails to a sandbox account, reading denial messages that name the exact policy, and simulating SCP conditions before they reach production.

IAMAWS Organizations

Announcing the LocalStack for Snowflake 2026.07.0 Release

LocalStack for Snowflake 2026.07.0 fixes persistence across restarts and improves compatibility for dbt workflows, DDL transactions, CTEs, UNPIVOT, QUALIFY, and JavaScript stored procedures.

releaseannouncement

Announcing the LocalStack for AWS 2026.07.0 Release

LocalStack for AWS 2026.07.0 adds Step Functions HTTP Tasks, Aurora DSQL CloudFormation and SQL dialect support, an ECS service scheduler, expanded AWS Replicator coverage, and CloudFormation update support for more than 50 resource types.

releaseannouncement

Testing S3 Replication Jobs Locally with LocalStack

Learn how to test Amazon S3 replication with LocalStack by configuring a cross-Region replication rule, catching an under-privileged replication role with IAM enforcement before it ships, and validating the whole flow, end-to-end on our local machine.