diff --git a/server/src/services/greenModeService/index.js b/server/src/services/greenModeService/index.js
index f473572c..4effbbaf 100644
--- a/server/src/services/greenModeService/index.js
+++ b/server/src/services/greenModeService/index.js
@@ -19,7 +19,7 @@ async function setEnabled(nextValue, options = {}) {
   const next = Boolean(nextValue);
   if (enabled === next) return enabled;
 
-  if (next) {
+  if (next && homeAssistantService.enabled) {
     /*
       Lock first because the existing locked-on transition sets lights white.
       Recoloring RGB lights afterward leaves them green while retaining the
@@ -54,7 +54,7 @@ async function setEnabled(nextValue, options = {}) {
     if (failures.length) {
       logger.warn('Some room controls failed to enter green mode', { failures });
     }
-  } else {
+  } else if (!next && homeAssistantService.enabled) {
     // Disabling the visual mode simply releases the lock it created. Bulb
     // colors remain untouched, matching the existing one-shot light behavior.
     await homeAssistantService.setLightsLockedOn(false, {
@@ -62,6 +62,14 @@ async function setEnabled(nextValue, options = {}) {
     });
   }
 
+  /*
+    Home Assistant is deliberately optional here. When it is not configured,
+    skipping the physical-room operations still allows the session theme,
+    CardFrame styling, alerts, commands, and timed reward to work normally.
+    The integration's generic lock state is also left untouched because there
+    are no server-managed room controls to lock.
+  */
+
   enabled = next;
   logger.info('Green mode changed', {
     enabled,
diff --git a/server/src/services/operatorCommandService/index.test.js b/server/src/services/operatorCommandService/index.test.js
index f6dd8785..e5714ab2 100644
--- a/server/src/services/operatorCommandService/index.test.js
+++ b/server/src/services/operatorCommandService/index.test.js
@@ -130,6 +130,11 @@ test('a disabled required feature is reported before any permission check', asyn
   assert.match(await run('rs lights on', nonAdmin), /Home Assistant feature is not configured/);
 });
 
+test('green mode remains available without optional Home Assistant features', async () => {
+  const run = createRouter({ featureEnabled: false });
+  assert.match(await run('rs green on', admin), /Green mode enabled/);
+});
+
 test('ordinary words that merely start with the prefix are not commands', async () => {
   const run = createRouter();
   assert.equal(await run('rsvp', nonAdmin), '');
diff --git a/server/src/services/operatorCommandService/registry.js b/server/src/services/operatorCommandService/registry.js
index ecc5efa1..ba5ea416 100644
--- a/server/src/services/operatorCommandService/registry.js
+++ b/server/src/services/operatorCommandService/registry.js
@@ -19,7 +19,10 @@ function buildCommandRegistry(prefix, timeCommand) {
     mode: { category: 'admin', summary: 'Change the server mode.', usage: [`${prefix} mode <open|turns|admin|lockdown>`], access: 'Admin', permission: 'admin' },
     reason: { category: 'admin', summary: 'Show, set, or clear the admin-mode reason.', usage: [`${prefix} reason [text|clear]`], access: 'Admin to change' },
     goal: { category: 'admin', summary: 'Show, set, or clear the global objective.', usage: [`${prefix} goal [text|clear]`], access: 'Admin to change' },
-    green: { category: 'admin', summary: 'Toggle green room and page mode.', usage: [`${prefix} green <on|off>`], access: 'Admin', permission: 'admin', requiredFeature: 'homeAssistant', unavailableLabel: 'Home Assistant' },
+    // Green mode is fundamentally a server theme. Home Assistant lighting is
+    // an optional enhancement, so the command must remain available when that
+    // integration is absent.
+    green: { category: 'admin', summary: 'Toggle green room and page mode.', usage: [`${prefix} green <on|off>`], access: 'Admin', permission: 'admin' },
     lights: {
       category: 'features',
       summary: 'Control room lights or manage the admin light lock.',