Show HN: Coasts – Containerized Hosts for Agents (github.com) AI

Coasts is a CLI tool that runs multiple isolated copies of a development environment on one machine by orchestrating Docker-based “coasts” tied to Git worktrees. It can use an existing docker-compose.yml or operate without Docker Compose, assigning dynamic ports for inspection and binding canonical ports one worktree at a time. The project is offline-first with no hosted dependency and includes a local observability web UI, plus macOS-first setup instructions and integration/unit test tooling.