News, tutorials, and insights from the LocalStack team on cloud emulation, product showcases, and local development practices.https://blog.localstack.cloud/https://blog.localstack.cloud/test-snowflake-sql-locally-with-your-ai-agent/https://blog.localstack.cloud/test-snowflake-sql-locally-with-your-ai-agent/We gave Claude Code the LocalStack MCP server and a CSV export of SaaS billing data, then asked it to build a quarterly Revenue-by-Plan report on our Snowflake emulator. It loaded the data, found & fixed two bugs, and proved the result, without touching the real Snowflake cloud.Tue, 29 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/testing-cognito-authentication-flows-locally-with-localstack/https://blog.localstack.cloud/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.Fri, 25 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/give-your-ai-agent-an-undo-button-for-aws-state/https://blog.localstack.cloud/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.Wed, 23 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/testing-aws-lambda-durable-functions-locally-with-localstack/https://blog.localstack.cloud/testing-aws-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.Thu, 17 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/ask-your-ai-agent-to-break-your-cloud-app/https://blog.localstack.cloud/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.Mon, 14 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/introducing-application-emulators-wondertwin-ai/https://blog.localstack.cloud/introducing-application-emulators-wondertwin-ai/Learn about LocalStack's acquisition of WonderTwin AI and how application emulation enables agentic full-stack emulation for AI-native software development.Mon, 14 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/introducing-lstk-cli/https://blog.localstack.cloud/introducing-lstk-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.Tue, 08 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/working-with-atproto-on-aws/https://blog.localstack.cloud/working-with-atproto-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.Thu, 03 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/localstack-for-snowflake-2026-08-0/https://blog.localstack.cloud/localstack-for-snowflake-2026-08-0/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.Wed, 02 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/stop-prompting-your-ai-agent/https://blog.localstack.cloud/stop-prompting-your-ai-agent/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.Tue, 01 Sep 2026 00:00:00 GMThttps://blog.localstack.cloud/localstack-for-aws-release-2026-08-0/https://blog.localstack.cloud/localstack-for-aws-release-2026-08-0/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.Wed, 26 Aug 2026 00:00:00 GMThttps://blog.localstack.cloud/how-to-test-aws-fargate-container-workloads-locally-with-localstack/https://blog.localstack.cloud/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.Tue, 25 Aug 2026 00:00:00 GMThttps://blog.localstack.cloud/use-aws-mcp-servers-with-localstack/https://blog.localstack.cloud/use-aws-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.Tue, 18 Aug 2026 00:00:00 GMThttps://blog.localstack.cloud/give-your-coding-agent-a-real-cloud-to-break/https://blog.localstack.cloud/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.Tue, 11 Aug 2026 00:00:00 GMThttps://blog.localstack.cloud/ai-agent-sandbox/https://blog.localstack.cloud/ai-agent-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.Thu, 06 Aug 2026 00:00:00 GMT