diff --git a/src/create.luau b/src/create.luau
index 48b89b5..c059fbf 100644
--- a/src/create.luau
+++ b/src/create.luau
@@ -97,26 +97,6 @@ export type Instances = {
     ViewportFrame: ViewportFrame,
     Camera: Camera,
     WorldModel: WorldModel,
-
-    -- interaction
-    ProximityPrompt: ProximityPrompt,
-
-    -- value objs
-    BoolValue: BoolValue,
-    IntValue: IntValue,
-    NumberValue: NumberValue,
-    StringValue: StringValue,
-    ObjectValue: ObjectValue,
-    ColorValue: Color3Value,
-    VectorValue: Vector3Value,
-    CFrameValue: CFrameValue,
-
-    -- styling
-    StyleSheet: StyleSheet,
-    StyleRule: StyleRule,
-    StyleDerive: StyleDerive,
-    StyleLink: StyleLink,
-    StyleQuery: StyleQuery,
 }
 
 export type function Properties(instance: type?)
diff --git a/src/graph.luau b/src/graph.luau
index fd22489..b85b66e 100644
--- a/src/graph.luau
+++ b/src/graph.luau
@@ -31,7 +31,14 @@ local function efn(err: string)
     end
 
     trace ..= "\nsource update stacktrace:"
-return trace
+    return trace
+end
+
+local function effect_traceback(err: unknown): string
+    local message = tostring(err)
+    -- Nested effect error already has full thread stack
+    if string.find(message, "^effect error:\n") then return message end
+    return `effect error:\n{debug.traceback(message, 2)}`
 end
 
 local function ycall<T, U>(fn: (T) -> U, arg: T): (boolean, string|U)
@@ -181,13 +188,13 @@ local function evaluate_node<T>(node: Node<T>)
         destroy_owned(node)
 
         push_scope(node)
-        local ok, new_value = pcall(node.effect :: (T) -> T, node.cache)
+        local ok, new_value = xpcall(node.effect :: (T) -> T, effect_traceback, node.cache)
         pop_scope()
 
         if not ok then
             table.clear(update_queue)
             update_queue.n = 0
-            error(`effect error:\n{new_value}\n`, 0)
+            error(new_value, 0)
         end
     
         node.cache = new_value