diff --git a/ClassicAPI.lua b/ClassicAPI.lua
index ead25e4..cfa34d6 100644
--- a/ClassicAPI.lua
+++ b/ClassicAPI.lua
@@ -337,6 +337,18 @@ function API.IsMounted()
     return IsMounted() and true or false
 end
 
+-- True if the player is under a WMO roof (building, cave, instance interior).
+-- Live engine geometry query, not zone-based; nil (-> false) pre-world.
+function API.IsIndoors()
+    return IsIndoors() and true or false
+end
+
+-- True if the player is outdoors (open sky / not inside a WMO interior).
+-- Exact complement of IsIndoors for a resolvable player.
+function API.IsOutdoors()
+    return IsOutdoors() and true or false
+end
+
 -- Player's stand state: 0 = standing, non-zero = sitting/sleeping/kneeling/etc.
 -- (see UnitStandState). Player-only.
 function API.GetPlayerStandState()
diff --git a/Conditionals.lua b/Conditionals.lua
index 18fafa5..43f268b 100644
--- a/Conditionals.lua
+++ b/Conditionals.lua
@@ -7352,6 +7352,26 @@ CleveRoids.Keywords = {
         return not CleveRoids.ClassicAPI.IsSwimming()
     end,
 
+    -- [indoors] - Player is under a WMO roof (building, cave, instance interior)
+    indoors = function(conditionals)
+        return CleveRoids.ClassicAPI.IsIndoors()
+    end,
+
+    -- [noindoors] - Player is NOT indoors
+    noindoors = function(conditionals)
+        return not CleveRoids.ClassicAPI.IsIndoors()
+    end,
+
+    -- [outdoors] - Player is outdoors (open sky / not inside a WMO interior)
+    outdoors = function(conditionals)
+        return CleveRoids.ClassicAPI.IsOutdoors()
+    end,
+
+    -- [nooutdoors] - Player is NOT outdoors
+    nooutdoors = function(conditionals)
+        return not CleveRoids.ClassicAPI.IsOutdoors()
+    end,
+
     -- [rooted] - Player is currently rooted (Nampower v2.36+)
     rooted = function(conditionals)
         if not CleveRoids.NampowerAPI.features.hasPlayerIsRooted then
@@ -9371,6 +9391,7 @@ CleveRoids.STATIC_CONDITIONALS = {
     mod = true, nomod = true,
     keydown = true, nokeydown = true,
     swimming = true, noswimming = true, swim = true, noswim = true,
+    indoors = true, noindoors = true, outdoors = true, nooutdoors = true,
     rooted = true, norooted = true,
     resting = true, noresting = true,
 }
diff --git a/Core.lua b/Core.lua
index 1b829ff..ded6587 100644
--- a/Core.lua
+++ b/Core.lua
@@ -153,6 +153,10 @@ local BOOLEAN_CONDITIONALS = {
     noohenchant = true,
     locked = true,
     nolocked = true,
+    indoors = true,
+    noindoors = true,
+    outdoors = true,
+    nooutdoors = true,
     group = true,
     nogroup = true,
     moving = true,