Agent-Up lets multiple coding agents share an app without full Docker containerization

Running multiple coding agents on the same application typically leads developers to containerize everything in Docker, but this approach introduces friction through stale images, slow rebuilds, and added debugging complexity. Agent-Up is an open-source tool that addresses the core collision points — ports, processes, browser profiles, logs, and environment state — without requiring full app containerization. Each agent workspace receives its own isolated port range, allowing apps to run normally via standard commands like npm run dev or dotnet run. The tool follows a split model: application code runs locally while infrastructure components such as databases, queues, and caches remain in Docker. Agent-Up coordinates both layers as a single unified workspace, complementing Git for source isolation and Docker for infrastructure isolation.