Coasts – Containerized Hosts for Agents
Hi HN - We've been working on Coasts (“containerized hosts”) to make it so you can run multiple localhost instances, and multiple docker-compose runtimes, across git worktrees on the same computer. Here’s a demo: https://www.youtube.com/watch?v=yRiySdGQZZA. There are also videos in our docs that give a good conceptual overview: https://coasts.dev/docs/learn-coasts-videos. Agents can make code changes in different worktrees in isolation, but it's hard for them to test their changes without multiple localhost runtimes that are isolated and scoped to those…
Coasts – Containerized Hosts for Agents launched on March 30, 2026 with 99 votes, #458 of 23,380 launches that month and more than 95% of that year's launches.
In plain words
Coasts enables developers to run multiple isolated localhost instances and docker-compose runtimes simultaneously across different git worktrees on a single computer. It solves the testing challenge for agents and developers making code changes in isolated branches by providing scoped, containerized environments for each worktree, eliminating the need for port hacking workarounds when dealing with complex multi-service docker setups.
written from the facts on this page · September 2026
From the sources
Localhost service isolation and orchestration for git worktrees. - coast-guard/coasts
In the maker’s words, at launch
Hi HN - We've been working on Coasts (“containerized hosts”) to make it so you can run multiple localhost instances, and multiple docker-compose runtimes, across git worktrees on the same computer. Here’s a demo: https://www.youtube.com/watch?v=yRiySdGQZZA. There are also videos in our docs that give a…
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