Observed arrival · 2026-08-29
localhost2137 Builds a Local World for Stateful Service Tests
A developer tool for running stateful emulator plugins for services such as Slack and Stripe, using provider-shaped APIs and controllable local test state.
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Field notes
The tool separates an application's provider-facing interface from the control interface used by tests and agents, allowing both to act on shared local state. Its configuration can seed a Slack workspace, pin virtual time, and expose a development endpoint under port 2137. The documentation also treats callbacks, retries, signatures, persistence, and asynchronous work as explicit testing boundaries rather than incidental mock behavior.
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