diff --git a/ui/src/adapters/metadata.ts b/ui/src/adapters/metadata.ts
index 3a35030a..297a7237 100644
--- a/ui/src/adapters/metadata.ts
+++ b/ui/src/adapters/metadata.ts
@@ -26,9 +26,11 @@ export function listKnownAdapterTypes(): string[] {
  * Unknown types (external adapters) are always considered enabled.
  */
 export function isEnabledAdapterType(type: string): boolean {
-  // Known external adapter — always valid
-  if (listUIAdapters().some((a) => a.type === type)) return true;
-  return !getAdapterDisplay(type).comingSoon;
+  // Check display registry first — built-in adapters like process/http are
+  // intentionally withheld even though they're registered as UI adapters.
+  if (getAdapterDisplay(type).comingSoon) return false;
+  // All other types (registered or external) are enabled.
+  return true;
 }
 
 /**
@@ -37,8 +39,8 @@ export function isEnabledAdapterType(type: string): boolean {
  * any non-"coming soon" adapter from the display registry.
  */
 export function isValidAdapterType(type: string): boolean {
-  if (listUIAdapters().some((a) => a.type === type)) return true;
-  return !getAdapterDisplay(type).comingSoon;
+  if (getAdapterDisplay(type).comingSoon) return false;
+  return true;
 }
 
 /**
diff --git a/ui/src/adapters/registry.test.ts b/ui/src/adapters/registry.test.ts
index b80dcc28..6d30f6b0 100644
--- a/ui/src/adapters/registry.test.ts
+++ b/ui/src/adapters/registry.test.ts
@@ -8,6 +8,7 @@ import {
   unregisterUIAdapter,
 } from "./registry";
 import { processUIAdapter } from "./process";
+import { SchemaConfigFields } from "./schema-config-fields";
 
 const externalUIAdapter: UIAdapterModule = {
   type: "external_test",
@@ -44,7 +45,7 @@ describe("ui adapter registry", () => {
     // Unknown types return a lazy-loading wrapper (for external adapters),
     // not the process adapter directly. The type is preserved.
     expect(fallback.type).toBe("external_test");
-    // But it uses the process parser under the hood.
-    expect(fallback.ConfigFields).toBe(processUIAdapter.ConfigFields);
+    // But it uses the schema-based config fields for external adapter forms.
+    expect(fallback.ConfigFields).toBe(SchemaConfigFields);
   });
 });