fs.mode internals

Detail supporting the fs.mode guidance in the skill body.

What is always read locally

A built-in local-by-default list applies in every fs mode, including the default read (mirrord/layer-lib/src/file/unix/read_local_by_default.rs):

• The process's current working directory — your entire project tree
• The executable being run
• Runtime and package-manager paths: /node_modules, /package.json, .yarnrc*, .tool-versions
• Source and build artifacts by extension: .js, .py, .pyc, .rb, .jar, .class, .so, .dll, .pdb
• System paths: /usr, /lib, /bin, /etc, /home, /opt, /tmp, /proc, /sys, /dev
• Hidden files under $HOME

So ts-node, nodemon, python -m, go run, dotnet watch etc. all load local source under the default config — no fs setting is needed for that.

What localwithoverrides reads remotely

localwithoverrides reads /etc/resolv.conf, /etc/hosts and /etc/hostname remotely by default (read_remote_by_default.rs) — plus whatever you add to fs.read_only / fs.read_write.