claude-remote-control: run a session per project directory

Generalize the always-on Remote Control module from a single session
pinned to /srv/dotfiles into one systemd user service per directory, so
new conversations can be started remotely (claude.ai/code / mobile) in
any of them without running `claude rc` by hand.

Each directory gets its own tmux socket, session, and Remote Control
name derived from its base name, plus a `claude-rc-attach-<name>` alias.
Directories that don't exist on a given host are skipped (impure
pathExists check) so the module can be shared across machines.

Initial set: dotfiles, subtr-actor, rocket-sense, mova. Enabled on both
railbird-sf and ryzen-shine.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

nixos/claude-remote-control.nix

@@ -5,18 +5,26 @@
   makeEnable,
   ...
 }: let
-  # Working directory the always-on session is pinned to. Ad-hoc sessions in
-  # other directories are handled by the `tmclaude` shell function instead.
-  workingDirectory = "/srv/dotfiles";
+  # Directories that each get an always-on Remote Control session, so new
+  # conversations can be started in any of them from claude.ai/code or the
+  # Claude mobile app (without having to run `claude rc` by hand first).
+  #
+  # Each directory gets its own systemd user service, tmux server (dedicated
+  # `-L` socket) and Remote Control session name derived from the directory's
+  # base name. Attach locally with the generated `claude-rc-attach-<name>`
+  # alias, e.g. `claude-rc-attach-dotfiles`.
+  candidateDirectories = [
+    "/srv/dotfiles"
+    "/home/imalison/Projects/subtr-actor"
+    "/home/imalison/Projects/rocket-sense"
+    "/home/imalison/code/mova"
+  ];
 
-  # Dedicated tmux socket + session name so the service owns its own tmux
-  # server (independent of the interactive one). Attach locally with:
-  #   tmux -L claude-rc attach -t claude-rc
-  socket = "claude-rc";
-  sessionName = "claude-rc";
-
-  # Name the session registers under for native Remote Control (phone/web).
-  remoteName = config.networking.hostName;
+  # Only run a session for directories that actually exist on this host, so the
+  # same module can be enabled across machines where some projects live at
+  # different paths (or not at all). Relies on impure evaluation, which the
+  # `just switch` workflow already uses (`nixos-rebuild ... --impure`).
+  directories = builtins.filter builtins.pathExists candidateDirectories;
 
   # claude shells out to these for its tools; give the service a clean PATH.
   servicePath = lib.makeBinPath (with pkgs; [
@@ -34,12 +42,22 @@
     ripgrep
     zsh
   ]);
-in
-  makeEnable config "myModules.claudeRemoteControl" false {
-    home-manager.users.imalison = {
-      systemd.user.services.claude-remote-control = {
+
+  mkName = dir: baseNameOf dir;
+
+  mkService = dir: let
+    name = mkName dir;
+    # Dedicated tmux socket + session name so each service owns its own tmux
+    # server, independent of the interactive one and of every other session.
+    socket = "claude-rc-${name}";
+    sessionName = "claude-rc-${name}";
+    # Name the session registers under for native Remote Control (phone/web).
+    remoteName = "${config.networking.hostName}-${name}";
+  in {
+    name = "claude-remote-control-${name}";
+    value = {
       Unit = {
-          Description = "Claude Code remote-control session";
+        Description = "Claude Code remote-control session (${dir})";
         After = ["network.target"];
       };
       Service = {
@@ -48,7 +66,7 @@ in
         Environment = ["PATH=${servicePath}"];
         ExecStart = lib.concatStringsSep " " [
           "${pkgs.tmux}/bin/tmux -L ${socket} new-session -d"
-            "-s ${sessionName} -c ${workingDirectory}"
+          "-s ${sessionName} -c ${dir}"
           "${pkgs.claude-code}/bin/claude --remote-control ${remoteName} --dangerously-skip-permissions"
         ];
         ExecStop = "${pkgs.tmux}/bin/tmux -L ${socket} kill-server";
@@ -57,8 +75,20 @@ in
       };
       Install.WantedBy = ["default.target"];
     };
+  };
 
-      # Convenience: attach to the always-on session from any directory.
-      home.shellAliases.claude-rc-attach = "tmux -L ${socket} attach -t ${sessionName}";
+  mkAlias = dir: let
+    name = mkName dir;
+  in {
+    name = "claude-rc-attach-${name}";
+    value = "tmux -L claude-rc-${name} attach -t claude-rc-${name}";
+  };
+in
+  makeEnable config "myModules.claudeRemoteControl" false {
+    home-manager.users.imalison = {
+      systemd.user.services = builtins.listToAttrs (map mkService directories);
+
+      # Convenience: attach to any always-on session from any directory.
+      home.shellAliases = builtins.listToAttrs (map mkAlias directories);
     };
   }

nixos/machines/ryzen-shine.nix

@@ -12,6 +12,7 @@
   ];
 
   features.full.enable = true;
+  myModules.claudeRemoteControl.enable = true;
   myModules.games.enable = lib.mkForce true;
   myModules.kubelet.enable = false;
   myModules.nvidia.enable = true;