Show HN: Coasts — Containerized Hosts for Agents, Full Runtime Isolation for Parallel AI Development — 87 Points

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Coasts (87pts, 36 comments) is an open-source CLI tool that gives each AI coding agent its own isolated runtime — dedicated ports, network, and services per worktree. Unlike worktrees alone (which isolate code but not runtimes), Coasts boots from existing docker-compose.yml or its own Coastfile format. It's agent-agnostic — works with Claude Code, Cursor, Codex, or any tool that uses git worktrees. The project directly addresses the parallel coding session problem where multiple agents conflict on shared localhost ports and databases.