fix(ai): preserve default reasoning efforts

src/components/settings/AiTab.test.tsx

@@ -105,6 +105,29 @@ describe("AI provider settings", () => {
     });
   });
 
+  it("preserves default reasoning efforts when customizing an unconfigured model", () => {
+    const initial = settingsWithProviders();
+    delete initial.models[0].supported_reasoning_efforts;
+    render(<Harness initial={initial} />);
+
+    fireEvent.click(screen.getByRole("button", { name: "ai.editModelConfig" }));
+    expect(screen.getByRole("button", { name: "none" }).getAttribute("aria-pressed")).toBe("true");
+    expect(screen.getByRole("button", { name: "minimal" }).getAttribute("aria-pressed")).toBe(
+      "false",
+    );
+    expect(screen.getByRole("button", { name: "low" }).getAttribute("aria-pressed")).toBe("true");
+
+    fireEvent.click(screen.getByRole("button", { name: "minimal" }));
+    expect(currentSettings.models[0].supported_reasoning_efforts).toEqual([
+      "none",
+      "minimal",
+      "low",
+      "medium",
+      "high",
+      "xhigh",
+    ]);
+  });
+
   it.each([
     ["Ollama", "ollama"],
     ["OpenAI-compatible", "openai_compatible"],

src/components/settings/AiTab.tsx

@@ -46,6 +46,7 @@ import {
   aiModelIdForCredential,
   aiModelIdForProvider,
   BUILTIN_PROVIDERS,
+  DEFAULT_MODEL_REASONING_EFFORTS,
   getCustomProviderBaseUrlPlaceholder,
   getProviderLabel,
   isBuiltinProvider,
@@ -1409,7 +1410,9 @@ export function AiModelsTab() {
   };
 
   const toggleModelReasoningEffort = (model: AIModelConfigItem, effort: AIModelReasoningEffort) => {
-    const selected = new Set(model.supported_reasoning_efforts ?? []);
+    const selected = new Set(
+      model.supported_reasoning_efforts ?? DEFAULT_MODEL_REASONING_EFFORTS,
+    );
     if (selected.has(effort)) selected.delete(effort);
     else selected.add(effort);
     updateModel(model.id, {
@@ -2066,7 +2069,9 @@ export function AiModelsTab() {
                         className="mt-2 flex flex-wrap gap-2"
                       >
                         {MODEL_REASONING_EFFORTS.map((effort) => {
-                          const selected = model.supported_reasoning_efforts?.includes(effort);
+                          const selected = (
+                            model.supported_reasoning_efforts ?? DEFAULT_MODEL_REASONING_EFFORTS
+                          ).includes(effort);
                           return (
                             <Button
                               key={effort}

src/lib/aiSettings.ts

@@ -21,9 +21,16 @@ export const MODEL_REASONING_EFFORTS: AIModelReasoningEffort[] = [
   "ultra",
 ];
 
+export const DEFAULT_MODEL_REASONING_EFFORTS: AIModelReasoningEffort[] = [
+  "none",
+  "low",
+  "medium",
+  "high",
+  "xhigh",
+];
+
 export function getModelReasoningOptions(model: AIModelConfigItem | null): AIReasoningEffort[] {
-  const supported = model?.supported_reasoning_efforts;
-  if (!supported) return ["auto", "none", "low", "medium", "high", "xhigh"];
+  const supported = model?.supported_reasoning_efforts ?? DEFAULT_MODEL_REASONING_EFFORTS;
   return ["auto", ...MODEL_REASONING_EFFORTS.filter((effort) => supported.includes(effort))];
 }