SethPyle376 released Hiraeth, a local AWS emulator that does one thing: fast SQS integration testing. Naftiko wraps existing HTTP APIs as AI-consumable capabilities, handling format conversion, authentication, and context management so agents get only the data they need. It accepts signed AWS SDK requests through a local HTTP endpoint on port 4566, stores everything in SQLite, and throws in a web admin UI on port 4567 so you can actually see what's happening with your queues. The project is early and honest about it. FIFO ordering and deduplication semantics are partially implemented. IAM and queue policy enforcement don't exist yet. But for basic create, send, receive workflows, it works.
Speed and simplicity. LocalStack gives you dozens of AWS services but eats memory and requires more setup. ElasticMQ works for SQS but carries JVM overhead and lacks a modern debug UI. Hiraeth starts fast, runs light, and doesn't pretend to be anything more than a test tool. Imbue uses their 'mngr' tool to run 100+ Claude agents in parallel for automated testing. The workflow converts tutorial scripts to pytest functions, assigns an agent to each test, and merges results into a single PR. mngr handles both local development and remote execution on Modal. The catch with any local emulator: it can't catch the weird AWS behaviors that only show up in real environments. Hacker News commenters brought this up, along with SmoothMQ, another SQS alternative focused on observability. Either way, the message queue simulator space has real competition now. Good news for developers tired of choosing between heavyweight emulators and AWS bills during test cycles.