diff --git a/packages/app/src/agent-controls/draft-options-model.ts b/packages/app/src/agent-controls/draft-options-model.ts
index aed92ded91..791b001b55 100644
--- a/packages/app/src/agent-controls/draft-options-model.ts
+++ b/packages/app/src/agent-controls/draft-options-model.ts
@@ -118,6 +118,15 @@ export type DraftControlsRequest = Pick<
   "provider" | "cwd" | "modeId" | "model" | "thinkingOptionId" | "providerOptions"
 >;
 
+/** What the draft's form has chosen; the options come from the model. */
+export interface DraftControlsForm {
+  provider: string | null;
+  cwd: string;
+  modeId?: string | null;
+  modelId?: string | null;
+  thinkingOptionId?: string | null;
+}
+
 /**
  * The listing request for the draft's form, built from one snapshot of the model. The form
  * reaches a new provider before the model has observed it, and the model still holds the
@@ -126,13 +135,7 @@ export type DraftControlsRequest = Pick<
  */
 export function draftControlsRequest(
   state: DraftOptionsState,
-  form: {
-    provider: string | null;
-    cwd: string;
-    modeId?: string | null;
-    modelId?: string | null;
-    thinkingOptionId?: string | null;
-  },
+  form: DraftControlsForm,
 ): DraftControlsRequest | null {
   if (!form.provider || !form.cwd || form.provider !== state.provider) return null;
   const providerOptions = ownDraftOptions(state);
diff --git a/packages/client/src/compat/legacy-provider-options.ts b/packages/client/src/compat/legacy-provider-options.ts
index 9dcda7b1a2..7085d26bf7 100644
--- a/packages/client/src/compat/legacy-provider-options.ts
+++ b/packages/client/src/compat/legacy-provider-options.ts
@@ -203,11 +203,15 @@ export class LegacyProviderOptions {
   };
 }
 
-/** A legacy daemon stores a profile's options under `featureValues`. */
+/**
+ * A legacy daemon stores a profile's options under `featureValues`, and keeps an `options` field
+ * a newer daemon left on it. Both are read, and an explicit `options` key wins, as it does on the
+ * daemon (`foldFeatureValues`).
+ */
 function profileWithOptions(profile: AgentProfile): AgentProfile {
-  if (profile.options || !profile.featureValues) return profile;
+  if (!profile.featureValues) return profile;
   const { featureValues, ...rest } = profile;
-  return { ...rest, options: featureValues };
+  return { ...rest, options: { ...featureValues, ...profile.options } };
 }
 
 function profileWithFeatureValues(profile: AgentProfile): AgentProfile {
diff --git a/packages/client/src/daemon-client.test.ts b/packages/client/src/daemon-client.test.ts
index e82c0dd7f9..d2659171d2 100644
--- a/packages/client/src/daemon-client.test.ts
+++ b/packages/client/src/daemon-client.test.ts
@@ -9165,6 +9165,47 @@ describe("provider options across daemon versions", () => {
     expect(written).not.toMatchObject({ config: { agentProfiles: [{ options: {} }] } });
   });
 
+  test("a legacy daemon's profile with both featureValues and options keeps both when saved", async () => {
+    // `options` survives on a legacy daemon's passthrough profile after a downgrade, while its
+    // own app keeps editing `featureValues`.
+    const { client, sentMessages, mock } = await connect({});
+    const reading = client.getDaemonConfig();
+    const [read] = sentMessages();
+    mock.triggerMessage(
+      wrapSessionMessage({
+        type: "get_daemon_config_response",
+        payload: {
+          requestId: read.requestId,
+          config: {
+            mcp: { injectIntoAgents: true },
+            agentProfiles: [
+              {
+                id: "p1",
+                name: "Mixed",
+                provider: "codex",
+                featureValues: { service_tier: "fast", sandbox_mode: "workspace-write" },
+                options: { sandbox_mode: "read-only" },
+              },
+            ],
+          },
+        },
+      }),
+    );
+    const { config } = await reading;
+    expect(config.agentProfiles?.[0]).toMatchObject({
+      options: { service_tier: "fast", sandbox_mode: "read-only" },
+    });
+    expect(config.agentProfiles?.[0]).not.toHaveProperty("featureValues");
+
+    void client.patchDaemonConfig({ agentProfiles: config.agentProfiles }).catch(() => {});
+    const written = sentMessages().find((message) => message.type === "set_daemon_config_request");
+    expect(written).toMatchObject({
+      config: {
+        agentProfiles: [{ featureValues: { service_tier: "fast", sandbox_mode: "read-only" } }],
+      },
+    });
+  });
+
   test("a legacy daemon applies a profile's options as feature values", async () => {
     const { client, sentMessages } = await connect({});
     void client.applyAgentConfig("agent-1", { options: { service_tier: "fast" } }).catch(() => {});