Coding agents in monorepos, with clear boundaries

AI coding agents working in monorepos need machine-readable repository boundaries because file proximity alone does not reveal dependencies, ownership, validation requirements, or deployment implications. Dependency and task graphs, such as Nx’s affected-command model, can connect changed files to impacted projects and required checks, while layered instruction files provide concise root-level rules and package-specific guidance for tools, tests, generators, and ownership constraints. Tasks should be scoped to an owning package and a defined dependency radius, with agents identifying consumers of shared code and preparing plans for cross-package changes that address interfaces, generated artifacts, and test targets. Running agents from narrow working directories and using isolated worktrees can reduce conflicts between concurrent changes. Affected-only validation should be supplemented by periodic full builds to identify missing graph edges, and failures should prompt metadata or dependency-graph fixes rather than broadly expanding routine checks. Stronger review and testing are recommended for shared libraries, generated clients, lockfile changes, and deployment-related packages, with production actions kept outside coding tasks unless explicitly authorized.

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