A setup script designed for Git worktrees can streamline development by diagnosing missing tools, sharing a single Docker stack, and isolating ports, databases, and state for parallel work. This ensures that each worktree operates independently, preventing conflicts.

A Git worktree provides separate working trees but shares the repository's core Git data. Without a specialized setup script, multiple worktrees can clash over shared resources like ports, databases, and container names, leading to failures or unintended state sharing. The frequency of using multiple worktrees has increased with parallel coding agents, making robust environment setup crucial.

An effective setup script, often named `bin/setup` or similar, should handle everything from bootstrapping toolchains (like `mise`) to diagnosing host requirements with a `bin/doctor` command. It must allocate unique ports and generate isolated configurations for each worktree, using a registry with locking for concurrent access. This ensures that each worktree, and its associated development server, can run without interfering with others.

Such a script should also manage resource cleanup, with a `bin/teardown` command that releases worktree-specific resources without affecting others. The goal is to enable coding agents to create, prepare, run, and remove a worktree cleanly, preventing environment failures as more agents are utilized.