Treat Modify bounds as transparent and drop the redundant fold-context validation

node-graph/node-macro/src/parsing.rs

@@ -940,11 +940,15 @@ fn parse_context_feature_idents(ty: &Type) -> Vec<ContextFeatureDecl> {
 						| "InjectVarArgs" => {
 							features.push(ContextFeatureDecl::new(segment.ident.clone()));
 						}
+						// Modify* is conditionally transparent: the node rewrites the
+						// field only on its content's behalf, so it names no
+						// requirement of its own and the field nullifies early when
+						// nothing upstream reads it.
+						"ModifyFootprint" | "ModifyRealTime" | "ModifyAnimationTime" | "ModifyPointerPosition" | "ModifyPosition" | "ModifyIndex" | "ModifyVarArgs" => {}
 						// InjectIndex stays undeclared: a record node's injection
 						// re-addresses lanes derived from the incoming index, so it
 						// must not cancel the cone's index requirement in the
 						// nullification pass.
-						// Skip Modify* traits as they don't affect usage tracking
 						// Also ignore other traits like Ctx, ExtractAll, etc.
 						_ => {}
 					}

node-graph/node-macro/src/validation.rs

@@ -15,7 +15,6 @@ pub fn validate_node_fn(parsed: &ParsedNodeFn) -> syn::Result<()> {
 		validate_lend_fields,
 		validate_record_io,
 		validate_lazy_reads,
-		validate_materialized_ctx,
 	];
 
 	for validator in validators {
@@ -262,30 +261,6 @@ fn validate_async_source(parsed: &ParsedNodeFn) {
 	}
 }
 
-fn validate_materialized_ctx(parsed: &ParsedNodeFn) {
-	let materialized = parsed
-		.fields
-		.iter()
-		.any(|field| matches!(&field.ty, ParsedFieldType::Regular(RegularParsedField { list_levels, .. }) if *list_levels > 0));
-	if !materialized {
-		return;
-	}
-	let Some(ctx) = crate::codegen::classify::context_param(parsed) else { return };
-	let has = |name: &str| {
-		ctx.bounds
-			.iter()
-			.any(|bound| matches!(bound, syn::TypeParamBound::Trait(bound) if bound.path.segments.last().is_some_and(|segment| segment.ident == name)))
-	};
-	let missing: Vec<&str> = ["InjectIndex", "Copy"].into_iter().filter(|name| !has(name)).collect();
-	if !missing.is_empty() {
-		emit_error!(
-			parsed.input.pat_ident.span(),
-			"a node folding a ranked `List` input drives `eval_batch` over it, so its context must add `{}`; spell `impl Ctx + InjectIndex + Copy`",
-			missing.join(" + ")
-		);
-	}
-}
-
 fn validate_lend_fields(parsed: &ParsedNodeFn) {
 	let future_kernel = crate::codegen::is_source_kernel(&parsed.output_type);
 	for field in &parsed.fields {