AWS Emulator: Amazon's local emulator of the AWS APIs, written entirely by autonomous AI agents

Amazon released AWS Emulator on November 11, 2026, a local emulator of the AWS APIs that runs on your own machine, a development server or in continuous integration, with no AWS account and no additional service fee. You point the AWS CLI or an AWS SDK at its local endpoint and test against emulated resources instead of the real cloud; on Linux it installs as an RPM or Debian package, on macOS and Windows it runs in a Docker container, and an embedded mode runs it inside Rust tests. AWS publishes per-service fidelity scores with each release, so developers can see how closely each service matches the real thing.

The launch is also an agent story: AWS says thousands of autonomous AI agents wrote every line of the emulator's code, and its team has neither written nor reviewed any of it. The work began as a weekend experiment in which the Kiro coding agent produced a passable Amazon SQS emulator in about 15 minutes; it is now built by three agent teams — one writes fidelity tests against real AWS, one replays them to find gaps, and one fixes single issues — with every fix passing a merge gate of build, security, coding-standard and fidelity checks. The emulator's handlers cover the 438 AWS API models, and the source is public on GitHub under a CC0 license. AWS is explicit about the limits: it is for building and testing, not production workloads or security testing.