diff --git a/ui/src/api/agents.ts b/ui/src/api/agents.ts
index 197a8995523..d3e79fc06ed 100644
--- a/ui/src/api/agents.ts
+++ b/ui/src/api/agents.ts
@@ -13,6 +13,10 @@ import type {
   Approval,
   AgentConfigRevision,
 } from "@paperclipai/shared";
+import type {
+  AdapterModelProfileDefinition,
+  AdapterModelProfileKey,
+} from "@paperclipai/adapter-utils";
 import { isUuidLike, normalizeAgentUrlKey } from "@paperclipai/shared";
 import { ApiError, api } from "./client";
 
@@ -28,15 +32,8 @@ export interface AdapterModel {
   label: string;
 }
 
-export type AdapterModelProfileKey = "cheap";
-
-export interface AdapterModelProfile {
-  key: AdapterModelProfileKey;
-  label: string;
-  description?: string;
-  adapterConfig: Record<string, unknown>;
-  source?: "adapter_default" | "discovered";
-}
+export type { AdapterModelProfileKey };
+export type AdapterModelProfile = AdapterModelProfileDefinition;
 
 export interface DetectedAdapterModel {
   model: string;
diff --git a/ui/src/components/IssueRunLedger.test.tsx b/ui/src/components/IssueRunLedger.test.tsx
index 94e89e1c797..e3baabc4420 100644
--- a/ui/src/components/IssueRunLedger.test.tsx
+++ b/ui/src/components/IssueRunLedger.test.tsx
@@ -451,7 +451,7 @@ describe("IssueRunLedger", () => {
           resultJson: {
             modelProfile: {
               requested: "cheap",
-              applied: "primary",
+              applied: null,
               configSource: null,
               fallbackReason: "agent_runtime_profile_disabled",
             },
@@ -461,7 +461,7 @@ describe("IssueRunLedger", () => {
     });
 
     expect(container.textContent).toContain("Profile: cheap");
-    expect(container.textContent).toContain("Profile: cheap → primary");
+    expect(container.textContent).toContain("Profile: cheap (unavailable)");
     expect(container.textContent).toContain("Cheap profile fell back to primary");
     expect(container.textContent).toContain("agent_runtime_profile_disabled");
   });
diff --git a/ui/src/lib/new-agent-runtime-config.test.ts b/ui/src/lib/new-agent-runtime-config.test.ts
index e44fc0248ce..f33cdc8538a 100644
--- a/ui/src/lib/new-agent-runtime-config.test.ts
+++ b/ui/src/lib/new-agent-runtime-config.test.ts
@@ -37,6 +37,7 @@ describe("buildNewAgentRuntimeConfig", () => {
       heartbeatEnabled: true,
       intervalSec: 600,
       cheapModel: "claude-sonnet-4-6",
+      cheapModelEnabled: true,
     });
 
     expect(config.modelProfiles).toEqual({
diff --git a/ui/src/lib/new-agent-runtime-config.ts b/ui/src/lib/new-agent-runtime-config.ts
index 4eb71f68a8a..0e106b984d8 100644
--- a/ui/src/lib/new-agent-runtime-config.ts
+++ b/ui/src/lib/new-agent-runtime-config.ts
@@ -18,7 +18,7 @@ export function buildNewAgentRuntimeConfig(input?: {
   };
 
   const cheapModel = input?.cheapModel?.trim() ?? "";
-  const cheapEnabled = input?.cheapModelEnabled !== false;
+  const cheapEnabled = input?.cheapModelEnabled ?? false;
   if (cheapModel && cheapEnabled) {
     config.modelProfiles = {
       cheap: {