AWS Emulator Goes GA: 200+ Services Run Locally, Built Almost Entirely by AI Agents
iamfakhrealam · x · 2026-11-14
AWS Emulator is now GA, letting you build and test AWS apps locally or in CI: existing AWS SDK/CLI calls return in milliseconds with no deployment or AWS account needed. Supported operations return the same results and errors as real AWS; unsupported ones return 501. State is kept in memory, and each instance gets its own port, keys and state so agents, test suites and CI jobs never collide.
Per the quoted thread, the product was built by hundreds of AI agents in 3 weeks with almost 30,000 commits, covering 200+ services and 438 API models. Three mutually distrusting agent teams: one writes tests from public API specs and checks them against real AWS; one runs those tests on the emulator and files mismatches; one fixes one issue per run — thousands fixed daily. The lead engineer said his team wrote and reviewed none of the code. Services are generated from AWS's published API models; source is CC0 public domain, with no extra fee for the emulator itself.
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