Coasts is an open-source platform designed to enable parallel, isolated runtimes for AI agents on local machines. It addresses the challenge of running multiple development environments simultaneously, which often leads to conflicts such as port collisions and competition for shared resources. By providing containerized hosts, Coasts allows developers to spin up fully isolated stacks for each agent, ensuring that each environment has its own ports, network, and services.
The tool operates at the runtime level and integrates with existing workflows using git worktrees. Developers can define environments with a Coastfile, which points to an existing Docker Compose configuration and specifies service ports. Coasts supports orchestrating multiple environments in parallel, assigning each to a separate worktree, and executing commands within each isolated runtime. The platform enables hot-swapping of services, selective resource sharing, and provides commands to list, manage, and route ports for each environment.
Coasts is delivered as a free, open-source command-line tool, installed via a shell script. It is MIT licensed and developed openly, with community engagement encouraged through GitHub and Discord. The platform is compatible with any agentic coding solution that uses worktrees, allowing teams to use their preferred AI coding tools without being locked into a specific harness or infrastructure. For scalability, Coasts supports running runtimes on remote hardware via SSH, enabling hybrid setups across local and cloud machines. The remote component, coast-service, can be self-hosted and is also open source.
The tool is aimed at developers and teams working with AI agents who require efficient, conflict-free parallel development and testing on their own hardware. Coasts emphasizes local-first operation, avoiding cloud dependencies and additional costs, and is backed by Y Combinator (F25).
In the Other infrastructure space, Coasts takes a focused approach. It focuses on running multiple isolated AI agent environments locally without cloud resources or conflicts. Coasts is an open-source project aimed at AI developers. The project is open source (MIT). The product ships for the command line, and it can be self-hosted.
Behind Coasts is Coasts, and the product first shipped in 2026. The project is developed in the open on GitHub with 408 stars and 161 commits in the last 90 days. Across PulseGate's embedding index, Coasts has few near neighbours, marking it as relatively distinct. Among its 5 catalogued features are parallel runtimes, local isolation, and docker integration.
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