allow creating and listing custom language model (#134)

.cursor/rules/ipc.mdc

@@ -7,7 +7,8 @@ You're building an Electron app following good security practices
 
 # IPC
 Structure:
-- [ipc_client.ts](mdc:src/ipc/ipc_client.ts) - lives in the renderer process and is used to send IPCs to the main process
+- [ipc_client.ts](mdc:src/ipc/ipc_client.ts) - lives in the renderer process and is used to send IPCs to the main process.
+    - to use it just do `IpcClient.getInstance()`
 - [preload.ts](mdc:src/preload.ts) - allowlist
 - [ipc_host.ts](mdc:src/ipc/ipc_host.ts) - contains the various IPC handlers attached which are: [app_handlers.ts](mdc:src/ipc/handlers/app_handlers.ts), [chat_stream_handlers.ts](mdc:src/ipc/handlers/chat_stream_handlers.ts), [settings_handlers.ts](mdc:src/ipc/handlers/settings_handlers.ts) etc.
 

src/components/CreateCustomModelDialog.tsx

@@ -0,0 +1,199 @@
+import React, { useState } from "react";
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogDescription,
+  DialogFooter,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { IpcClient } from "@/ipc/ipc_client";
+import { useMutation } from "@tanstack/react-query";
+import { showError, showSuccess } from "@/lib/toast";
+
+interface CreateCustomModelDialogProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onSuccess: () => void;
+  providerId: string;
+}
+
+export function CreateCustomModelDialog({
+  isOpen,
+  onClose,
+  onSuccess,
+  providerId,
+}: CreateCustomModelDialogProps) {
+  const [id, setId] = useState("");
+  const [name, setName] = useState("");
+  const [description, setDescription] = useState("");
+  const [maxOutputTokens, setMaxOutputTokens] = useState<string>("");
+  const [contextWindow, setContextWindow] = useState<string>("");
+
+  const ipcClient = IpcClient.getInstance();
+
+  const mutation = useMutation({
+    mutationFn: async () => {
+      const params = {
+        id,
+        name,
+        providerId,
+        description: description || undefined,
+        maxOutputTokens: maxOutputTokens
+          ? parseInt(maxOutputTokens, 10)
+          : undefined,
+        contextWindow: contextWindow ? parseInt(contextWindow, 10) : undefined,
+      };
+
+      if (!params.id) throw new Error("Model ID is required");
+      if (!params.name) throw new Error("Model Name is required");
+      if (maxOutputTokens && isNaN(params.maxOutputTokens ?? NaN))
+        throw new Error("Max Output Tokens must be a valid number");
+      if (contextWindow && isNaN(params.contextWindow ?? NaN))
+        throw new Error("Context Window must be a valid number");
+
+      await ipcClient.createCustomLanguageModel(params);
+    },
+    onSuccess: () => {
+      showSuccess("Custom model created successfully!");
+      resetForm();
+      onSuccess(); // Refetch or update UI
+      onClose();
+    },
+    onError: (error) => {
+      showError(error);
+    },
+  });
+
+  const resetForm = () => {
+    setId("");
+    setName("");
+    setDescription("");
+    setMaxOutputTokens("");
+    setContextWindow("");
+  };
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    mutation.mutate();
+  };
+
+  const handleClose = () => {
+    if (!mutation.isPending) {
+      resetForm();
+      onClose();
+    }
+  };
+
+  return (
+    <Dialog open={isOpen} onOpenChange={handleClose}>
+      <DialogContent className="sm:max-w-[525px]">
+        <DialogHeader>
+          <DialogTitle>Add Custom Model</DialogTitle>
+          <DialogDescription>
+            Configure a new language model for the selected provider.
+          </DialogDescription>
+        </DialogHeader>
+        <form onSubmit={handleSubmit}>
+          <div className="grid gap-4 py-4">
+            <div className="grid grid-cols-4 items-center gap-4">
+              <Label htmlFor="model-id" className="text-right">
+                Model ID*
+              </Label>
+              <Input
+                id="model-id"
+                value={id}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
+                  setId(e.target.value)
+                }
+                className="col-span-3"
+                placeholder="This must match the model expected by the API"
+                required
+                disabled={mutation.isPending}
+              />
+            </div>
+            <div className="grid grid-cols-4 items-center gap-4">
+              <Label htmlFor="model-name" className="text-right">
+                Name*
+              </Label>
+              <Input
+                id="model-name"
+                value={name}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
+                  setName(e.target.value)
+                }
+                className="col-span-3"
+                placeholder="Human-friendly name for the model"
+                required
+                disabled={mutation.isPending}
+              />
+            </div>
+            <div className="grid grid-cols-4 items-center gap-4">
+              <Label htmlFor="description" className="text-right">
+                Description
+              </Label>
+              <Input
+                id="description"
+                value={description}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
+                  setDescription(e.target.value)
+                }
+                className="col-span-3"
+                placeholder="Optional: Describe the model's capabilities"
+                disabled={mutation.isPending}
+              />
+            </div>
+            <div className="grid grid-cols-4 items-center gap-4">
+              <Label htmlFor="max-output-tokens" className="text-right">
+                Max Output Tokens
+              </Label>
+              <Input
+                id="max-output-tokens"
+                type="number"
+                value={maxOutputTokens}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
+                  setMaxOutputTokens(e.target.value)
+                }
+                className="col-span-3"
+                placeholder="Optional: e.g., 4096"
+                disabled={mutation.isPending}
+              />
+            </div>
+            <div className="grid grid-cols-4 items-center gap-4">
+              <Label htmlFor="context-window" className="text-right">
+                Context Window
+              </Label>
+              <Input
+                id="context-window"
+                type="number"
+                value={contextWindow}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
+                  setContextWindow(e.target.value)
+                }
+                className="col-span-3"
+                placeholder="Optional: e.g., 8192"
+                disabled={mutation.isPending}
+              />
+            </div>
+          </div>
+          <DialogFooter>
+            <Button
+              type="button"
+              variant="outline"
+              onClick={handleClose}
+              disabled={mutation.isPending}
+            >
+              Cancel
+            </Button>
+            <Button type="submit" disabled={mutation.isPending}>
+              {mutation.isPending ? "Adding..." : "Add Model"}
+            </Button>
+          </DialogFooter>
+        </form>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/components/settings/ApiKeyConfiguration.tsx

@@ -0,0 +1,194 @@
+import { Info, KeyRound, Trash2 } from "lucide-react";
+import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
+import {
+  Accordion,
+  AccordionContent,
+  AccordionItem,
+  AccordionTrigger,
+} from "@/components/ui/accordion";
+import { Input } from "@/components/ui/input";
+import { Button } from "@/components/ui/button";
+import { UserSettings } from "@/lib/schemas";
+
+// Helper function to mask ENV API keys (move or duplicate if needed elsewhere)
+const maskEnvApiKey = (key: string | undefined): string => {
+  if (!key) return "Not Set";
+  if (key.length < 8) return "****";
+  return `${key.substring(0, 4)}...${key.substring(key.length - 4)}`;
+};
+
+interface ApiKeyConfigurationProps {
+  provider: string;
+  providerDisplayName: string;
+  settings: UserSettings | null | undefined;
+  envVars: Record<string, string | undefined>;
+  envVarName?: string;
+  isSaving: boolean;
+  saveError: string | null;
+  apiKeyInput: string;
+  onApiKeyInputChange: (value: string) => void;
+  onSaveKey: () => Promise<void>;
+  onDeleteKey: () => Promise<void>;
+  isDyad: boolean;
+}
+
+export function ApiKeyConfiguration({
+  provider,
+  providerDisplayName,
+  settings,
+  envVars,
+  envVarName,
+  isSaving,
+  saveError,
+  apiKeyInput,
+  onApiKeyInputChange,
+  onSaveKey,
+  onDeleteKey,
+  isDyad,
+}: ApiKeyConfigurationProps) {
+  const envApiKey = envVarName ? envVars[envVarName] : undefined;
+  const userApiKey = settings?.providerSettings?.[provider]?.apiKey?.value;
+
+  const isValidUserKey =
+    !!userApiKey &&
+    !userApiKey.startsWith("Invalid Key") &&
+    userApiKey !== "Not Set";
+  const hasEnvKey = !!envApiKey;
+
+  const activeKeySource = isValidUserKey
+    ? "settings"
+    : hasEnvKey
+      ? "env"
+      : "none";
+
+  const defaultAccordionValue = [];
+  if (isValidUserKey || !hasEnvKey) {
+    defaultAccordionValue.push("settings-key");
+  }
+  if (!isDyad && hasEnvKey) {
+    defaultAccordionValue.push("env-key");
+  }
+
+  return (
+    <Accordion
+      type="multiple"
+      className="w-full space-y-4"
+      defaultValue={defaultAccordionValue}
+    >
+      <AccordionItem
+        value="settings-key"
+        className="border rounded-lg px-4 bg-(--background-lightest)"
+      >
+        <AccordionTrigger className="text-lg font-medium hover:no-underline cursor-pointer">
+          API Key from Settings
+        </AccordionTrigger>
+        <AccordionContent className="pt-4 ">
+          {isValidUserKey && (
+            <Alert variant="default" className="mb-4">
+              <KeyRound className="h-4 w-4" />
+              <AlertTitle className="flex justify-between items-center">
+                <span>Current Key (Settings)</span>
+                <Button
+                  variant="destructive"
+                  size="sm"
+                  onClick={onDeleteKey}
+                  disabled={isSaving}
+                  className="flex items-center gap-1 h-7 px-2"
+                >
+                  <Trash2 className="h-4 w-4" />
+                  {isSaving ? "Deleting..." : "Delete"}
+                </Button>
+              </AlertTitle>
+              <AlertDescription>
+                <p className="font-mono text-sm">{userApiKey}</p>
+                {activeKeySource === "settings" && (
+                  <p className="text-xs text-green-600 dark:text-green-400 mt-1">
+                    This key is currently active.
+                  </p>
+                )}
+              </AlertDescription>
+            </Alert>
+          )}
+
+          <div className="space-y-2">
+            <label
+              htmlFor="apiKeyInput"
+              className="block text-sm font-medium text-gray-700 dark:text-gray-300"
+            >
+              {isValidUserKey ? "Update" : "Set"} {providerDisplayName} API Key
+            </label>
+            <div className="flex items-start space-x-2">
+              <Input
+                id="apiKeyInput"
+                value={apiKeyInput}
+                onChange={(e) => onApiKeyInputChange(e.target.value)}
+                placeholder={`Enter new ${providerDisplayName} API Key here`}
+                className={`flex-grow ${saveError ? "border-red-500" : ""}`}
+              />
+              <Button onClick={onSaveKey} disabled={isSaving || !apiKeyInput}>
+                {isSaving ? "Saving..." : "Save Key"}
+              </Button>
+            </div>
+            {saveError && <p className="text-xs text-red-600">{saveError}</p>}
+            <p className="text-xs text-gray-500 dark:text-gray-400">
+              Setting a key here will override the environment variable (if
+              set).
+            </p>
+          </div>
+        </AccordionContent>
+      </AccordionItem>
+
+      {!isDyad && envVarName && (
+        <AccordionItem
+          value="env-key"
+          className="border rounded-lg px-4 bg-(--background-lightest)"
+        >
+          <AccordionTrigger className="text-lg font-medium hover:no-underline cursor-pointer">
+            API Key from Environment Variable
+          </AccordionTrigger>
+          <AccordionContent className="pt-4">
+            {hasEnvKey ? (
+              <Alert variant="default">
+                <KeyRound className="h-4 w-4" />
+                <AlertTitle>Environment Variable Key ({envVarName})</AlertTitle>
+                <AlertDescription>
+                  <p className="font-mono text-sm">
+                    {maskEnvApiKey(envApiKey)}
+                  </p>
+                  {activeKeySource === "env" && (
+                    <p className="text-xs text-green-600 dark:text-green-400 mt-1">
+                      This key is currently active (no settings key set).
+                    </p>
+                  )}
+                  {activeKeySource === "settings" && (
+                    <p className="text-xs text-yellow-600 dark:text-yellow-400 mt-1">
+                      This key is currently being overridden by the key set in
+                      Settings.
+                    </p>
+                  )}
+                </AlertDescription>
+              </Alert>
+            ) : (
+              <Alert variant="default">
+                <Info className="h-4 w-4" />
+                <AlertTitle>Environment Variable Not Set</AlertTitle>
+                <AlertDescription>
+                  The{" "}
+                  <code className="font-mono bg-gray-100 dark:bg-gray-800 px-1 rounded text-xs">
+                    {envVarName}
+                  </code>{" "}
+                  environment variable is not set.
+                </AlertDescription>
+              </Alert>
+            )}
+            <p className="text-xs text-gray-500 dark:text-gray-400 mt-3">
+              This key is set outside the application. If present, it will be
+              used only if no key is configured in the Settings section above.
+              Requires app restart to detect changes.
+            </p>
+          </AccordionContent>
+        </AccordionItem>
+      )}
+    </Accordion>
+  );
+}

src/components/settings/ModelsSection.tsx

@@ -0,0 +1,114 @@
+import { useState } from "react";
+import { AlertTriangle, PlusIcon } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Skeleton } from "@/components/ui/skeleton";
+import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
+import { CreateCustomModelDialog } from "@/components/CreateCustomModelDialog";
+import { useLanguageModelsForProvider } from "@/hooks/useLanguageModelsForProvider"; // Use the hook directly here
+
+interface ModelsSectionProps {
+  providerId: string;
+}
+
+export function ModelsSection({ providerId }: ModelsSectionProps) {
+  const [isCustomModelDialogOpen, setIsCustomModelDialogOpen] = useState(false);
+
+  // Fetch custom models within this component now
+  const {
+    data: models,
+    isLoading: modelsLoading,
+    error: modelsError,
+    refetch: refetchModels,
+  } = useLanguageModelsForProvider(providerId);
+
+  return (
+    <div className="mt-8 border-t pt-6">
+      <h2 className="text-2xl font-semibold mb-4">Models</h2>
+      <p className="text-muted-foreground mb-4">
+        Manage specific models available through this provider.
+      </p>
+
+      {/* Custom Models List Area */}
+      {modelsLoading && (
+        <div className="space-y-3 mt-4">
+          <Skeleton className="h-24 w-full rounded-lg" />
+          <Skeleton className="h-24 w-full rounded-lg" />
+        </div>
+      )}
+      {modelsError && (
+        <Alert variant="destructive" className="mt-4">
+          <AlertTriangle className="h-4 w-4" />
+          <AlertTitle>Error Loading Models</AlertTitle>
+          <AlertDescription>{modelsError.message}</AlertDescription>
+        </Alert>
+      )}
+      {!modelsLoading && !modelsError && models && models.length > 0 && (
+        <div className="mt-4 space-y-3">
+          {models.map((model) => (
+            <div
+              key={model.name}
+              className="p-4 bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-700 rounded-lg shadow-sm"
+            >
+              <div className="flex justify-between items-center">
+                <h4 className="text-lg font-semibold text-gray-800 dark:text-gray-100">
+                  {model.displayName}
+                </h4>
+                {/* Optional: Add an edit/delete button here later */}
+              </div>
+              <p className="text-sm text-gray-500 dark:text-gray-400 italic">
+                {model.name}
+              </p>
+              {model.description && (
+                <p className="text-sm text-gray-600 dark:text-gray-300 mt-1">
+                  {model.description}
+                </p>
+              )}
+              <div className="flex flex-wrap gap-x-4 gap-y-1 mt-2 text-xs text-gray-500 dark:text-gray-400">
+                {model.contextWindow && (
+                  <span>
+                    Context: {model.contextWindow.toLocaleString()} tokens
+                  </span>
+                )}
+                {model.maxOutputTokens && (
+                  <span>
+                    Max Output: {model.maxOutputTokens.toLocaleString()} tokens
+                  </span>
+                )}
+              </div>
+              {model.tag && (
+                <span className="mt-2 inline-block bg-blue-100 text-blue-800 text-xs font-medium px-2.5 py-0.5 rounded-full dark:bg-blue-900 dark:text-blue-300">
+                  {model.tag}
+                </span>
+              )}
+            </div>
+          ))}
+        </div>
+      )}
+      {!modelsLoading && !modelsError && (!models || models.length === 0) && (
+        <p className="text-muted-foreground mt-4">
+          No custom models have been added for this provider yet.
+        </p>
+      )}
+      {/* End Custom Models List Area */}
+
+      <Button
+        onClick={() => setIsCustomModelDialogOpen(true)}
+        variant="outline"
+        className="mt-6"
+      >
+        <PlusIcon className="mr-2 h-4 w-4" /> Add Custom Model
+      </Button>
+
+      {/* Render the dialog */}
+      <CreateCustomModelDialog
+        isOpen={isCustomModelDialogOpen}
+        onClose={() => setIsCustomModelDialogOpen(false)}
+        onSuccess={() => {
+          setIsCustomModelDialogOpen(false);
+          refetchModels(); // Refetch models on success
+        }}
+        providerId={providerId}
+      />
+    </div>
+  );
+}

src/components/settings/ProviderSettingsHeader.tsx

@@ -0,0 +1,115 @@
+import {
+  ArrowLeft,
+  Circle,
+  ExternalLink,
+  GiftIcon,
+  KeyRound,
+  Settings as SettingsIcon,
+} from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Skeleton } from "@/components/ui/skeleton";
+import { IpcClient } from "@/ipc/ipc_client";
+
+interface ProviderSettingsHeaderProps {
+  providerDisplayName: string;
+  isConfigured: boolean;
+  isLoading: boolean;
+  hasFreeTier?: boolean;
+  providerWebsiteUrl?: string;
+  isDyad: boolean;
+  onBackClick: () => void;
+}
+
+function getKeyButtonText({
+  isConfigured,
+  isDyad,
+}: {
+  isConfigured: boolean;
+  isDyad: boolean;
+}) {
+  if (isDyad) {
+    return isConfigured
+      ? "Manage Dyad Pro Subscription"
+      : "Setup Dyad Pro Subscription";
+  }
+  return isConfigured ? "Manage API Keys" : "Setup API Key";
+}
+
+export function ProviderSettingsHeader({
+  providerDisplayName,
+  isConfigured,
+  isLoading,
+  hasFreeTier,
+  providerWebsiteUrl,
+  isDyad,
+  onBackClick,
+}: ProviderSettingsHeaderProps) {
+  const handleGetApiKeyClick = (e: React.MouseEvent<HTMLButtonElement>) => {
+    e.preventDefault();
+    if (providerWebsiteUrl) {
+      IpcClient.getInstance().openExternalUrl(providerWebsiteUrl);
+    }
+  };
+
+  return (
+    <>
+      <Button
+        onClick={onBackClick}
+        variant="outline"
+        size="sm"
+        className="flex items-center gap-2 mb-4 bg-(--background-lightest) py-5"
+      >
+        <ArrowLeft className="h-4 w-4" />
+        Go Back
+      </Button>
+
+      <div className="mb-6">
+        <div className="flex items-center mb-1">
+          <h1 className="text-3xl font-bold text-gray-900 dark:text-white mr-3">
+            Configure {providerDisplayName}
+          </h1>
+          {isLoading ? (
+            <Skeleton className="h-6 w-6 rounded-full" />
+          ) : (
+            <Circle
+              className={`h-5 w-5 ${
+                isConfigured
+                  ? "fill-green-500 text-green-600"
+                  : "fill-yellow-400 text-yellow-500"
+              }`}
+            />
+          )}
+          <span className="ml-2 text-sm text-gray-600 dark:text-gray-400">
+            {isLoading
+              ? "Loading..."
+              : isConfigured
+                ? "Setup Complete"
+                : "Not Setup"}
+          </span>
+        </div>
+        {!isLoading && hasFreeTier && (
+          <span className="text-blue-600 mt-2 dark:text-blue-400 text-sm font-medium bg-blue-100 dark:bg-blue-900/30 px-2 py-1 rounded-full inline-flex items-center">
+            <GiftIcon className="w-4 h-4 mr-1" />
+            Free tier available
+          </span>
+        )}
+      </div>
+
+      {providerWebsiteUrl && !isLoading && (
+        <Button
+          onClick={handleGetApiKeyClick}
+          className="mb-4 bg-(--background-lightest) cursor-pointer py-5"
+          variant="outline"
+        >
+          {isConfigured ? (
+            <SettingsIcon className="mr-2 h-4 w-4" />
+          ) : (
+            <KeyRound className="mr-2 h-4 w-4" />
+          )}
+          {getKeyButtonText({ isConfigured, isDyad })}
+          <ExternalLink className="ml-2 h-4 w-4" />
+        </Button>
+      )}
+    </>
+  );
+}

src/components/settings/ProviderSettingsPage.tsx

@@ -1,44 +1,26 @@
 import { useState, useEffect } from "react";
 import { useRouter } from "@tanstack/react-router";
-import {
-  ArrowLeft,
-  ExternalLink,
-  KeyRound,
-  Info,
-  Circle,
-  Settings as SettingsIcon,
-  GiftIcon,
-  Trash2,
-  AlertTriangle,
-} from "lucide-react";
+import { ArrowLeft, AlertTriangle } from "lucide-react";
 import { useSettings } from "@/hooks/useSettings";
 import { useLanguageModelProviders } from "@/hooks/useLanguageModelProviders";
+
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { Skeleton } from "@/components/ui/skeleton";
-import {
-  Accordion,
-  AccordionContent,
-  AccordionItem,
-  AccordionTrigger,
-} from "@/components/ui/accordion";
-import { Input } from "@/components/ui/input";
+import {} from "@/components/ui/accordion";
+
 import { Button } from "@/components/ui/button";
-import { IpcClient } from "@/ipc/ipc_client";
 import { Switch } from "@/components/ui/switch";
 import { showError } from "@/lib/toast";
 import { UserSettings } from "@/lib/schemas";
 
+import { ProviderSettingsHeader } from "./ProviderSettingsHeader";
+import { ApiKeyConfiguration } from "./ApiKeyConfiguration";
+import { ModelsSection } from "./ModelsSection";
+
 interface ProviderSettingsPageProps {
   provider: string;
 }
 
-// Helper function to mask ENV API keys (still needed for env vars)
-const maskEnvApiKey = (key: string | undefined): string => {
-  if (!key) return "Not Set";
-  if (key.length < 8) return "****";
-  return `${key.substring(0, 4)}...${key.substring(key.length - 4)}`;
-};
-
 export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
   const {
     settings,
@@ -55,6 +37,11 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
     error: providersError,
   } = useLanguageModelProviders();
 
+  // Find the specific provider data from the fetched list
+  const providerData = allProviders?.find((p) => p.id === provider);
+  const supportsCustomModels =
+    providerData?.type === "custom" || providerData?.type === "cloud";
+
   const isDyad = provider === "auto";
 
   const [apiKeyInput, setApiKeyInput] = useState("");
@@ -62,9 +49,6 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
   const [saveError, setSaveError] = useState<string | null>(null);
   const router = useRouter();
 
-  // Find the specific provider data from the fetched list
-  const providerData = allProviders?.find((p) => p.id === provider);
-
   // Use fetched data (or defaults for Dyad)
   const providerDisplayName = isDyad
     ? "Dyad"
@@ -74,7 +58,6 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
     : providerData?.websiteUrl;
   const hasFreeTier = isDyad ? false : providerData?.hasFreeTier;
   const envVarName = isDyad ? undefined : providerData?.envVarName;
-  const envApiKey = envVarName ? envVars[envVarName] : undefined;
 
   // Use provider ID (which is the 'provider' prop)
   const userApiKey = settings?.providerSettings?.[provider]?.apiKey?.value;
@@ -84,25 +67,9 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
     !!userApiKey &&
     !userApiKey.startsWith("Invalid Key") &&
     userApiKey !== "Not Set";
-  const hasEnvKey = !!envApiKey;
+  const hasEnvKey = !!(envVarName && envVars[envVarName]);
 
   const isConfigured = isValidUserKey || hasEnvKey; // Configured if either is set
-  // Settings key takes precedence if it's valid
-  const activeKeySource = isValidUserKey
-    ? "settings"
-    : hasEnvKey
-      ? "env"
-      : "none";
-
-  // --- Accordion Logic ---
-  const defaultAccordionValue = [];
-  if (isValidUserKey || !hasEnvKey) {
-    // If user key is set OR env key is NOT set, open the settings accordion item
-    defaultAccordionValue.push("settings-key");
-  }
-  if (hasEnvKey) {
-    defaultAccordionValue.push("env-key");
-  }
 
   // --- Save Handler ---
   const handleSaveKey = async () => {
@@ -182,24 +149,23 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
     }
   }, [apiKeyInput]);
 
-  // --- Loading State for Providers --- (Added)
+  // --- Loading State for Providers ---
   if (providersLoading) {
     return (
       <div className="min-h-screen px-8 py-4">
         <div className="max-w-4xl mx-auto">
-          <Skeleton className="h-8 w-24 mb-4" /> {/* Back button */}
-          <Skeleton className="h-10 w-1/2 mb-6" /> {/* Title */}
-          <Skeleton className="h-10 w-48 mb-4" /> {/* Get Key button */}
-          <div className="space-y-4">
-            <Skeleton className="h-20 w-full" />
-            <Skeleton className="h-20 w-full" />
+          <Skeleton className="h-8 w-24 mb-4" />
+          <Skeleton className="h-10 w-1/2 mb-6" />
+          <Skeleton className="h-10 w-48 mb-4" />
+          <div className="space-y-4 mt-6">
+            <Skeleton className="h-40 w-full" />
           </div>
         </div>
       </div>
     );
   }
 
-  // --- Error State for Providers --- (Added)
+  // --- Error State for Providers ---
   if (providersError) {
     return (
       <div className="min-h-screen px-8 py-4">
@@ -260,71 +226,19 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
   return (
     <div className="min-h-screen px-8 py-4">
       <div className="max-w-4xl mx-auto">
-        <Button
-          onClick={() => router.history.back()}
-          variant="outline"
-          size="sm"
-          className="flex items-center gap-2 mb-4 bg-(--background-lightest) py-5"
-        >
-          <ArrowLeft className="h-4 w-4" />
-          Go Back
-        </Button>
-
-        <div className="mb-6">
-          <div className="flex items-center mb-1">
-            <h1 className="text-3xl font-bold text-gray-900 dark:text-white mr-3">
-              Configure {providerDisplayName}
-            </h1>
-            {settingsLoading ? (
-              <Skeleton className="h-6 w-6 rounded-full" />
-            ) : (
-              <Circle
-                className={`h-5 w-5 ${
-                  isConfigured
-                    ? "fill-green-500 text-green-600"
-                    : "fill-yellow-400 text-yellow-500"
-                }`}
+        <ProviderSettingsHeader
+          providerDisplayName={providerDisplayName}
+          isConfigured={isConfigured}
+          isLoading={settingsLoading}
+          hasFreeTier={hasFreeTier}
+          providerWebsiteUrl={providerWebsiteUrl}
+          isDyad={isDyad}
+          onBackClick={() => router.history.back()}
         />
-            )}
-            <span className="ml-2 text-sm text-gray-600 dark:text-gray-400">
-              {settingsLoading
-                ? "Loading..."
-                : isConfigured
-                  ? "Setup Complete"
-                  : "Not Setup"}
-            </span>
-          </div>
-          {!settingsLoading && hasFreeTier && (
-            <span className="text-blue-600 mt-2 dark:text-blue-400 text-sm font-medium bg-blue-100 dark:bg-blue-900/30 px-2 py-1 rounded-full inline-flex items-center">
-              <GiftIcon className="w-4 h-4 mr-1" />
-              Free tier available
-            </span>
-          )}
-        </div>
-
-        {providerWebsiteUrl && !settingsLoading && (
-          <Button
-            onClick={(e) => {
-              e.preventDefault();
-              IpcClient.getInstance().openExternalUrl(providerWebsiteUrl);
-            }}
-            className="mb-4 bg-(--background-lightest) cursor-pointer py-5"
-            variant="outline"
-          >
-            {isConfigured ? (
-              <SettingsIcon className="mr-2 h-4 w-4" />
-            ) : (
-              <KeyRound className="mr-2 h-4 w-4" />
-            )}
-            {getKeyButtonText({ isConfigured, isDyad })}
-            <ExternalLink className="ml-2 h-4 w-4" />
-          </Button>
-        )}
 
         {settingsLoading ? (
           <div className="space-y-4">
-            <Skeleton className="h-20 w-full" />
-            <Skeleton className="h-20 w-full" />
+            <Skeleton className="h-40 w-full" />
           </div>
         ) : settingsError ? (
           <Alert variant="destructive">
@@ -334,136 +248,20 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
             </AlertDescription>
           </Alert>
         ) : (
-          <Accordion
-            type="multiple"
-            className="w-full space-y-4"
-            defaultValue={defaultAccordionValue}
-          >
-            <AccordionItem
-              value="settings-key"
-              className="border rounded-lg px-4 bg-(--background-lightest)"
-            >
-              <AccordionTrigger className="text-lg font-medium hover:no-underline cursor-pointer">
-                API Key from Settings
-              </AccordionTrigger>
-              <AccordionContent className="pt-4 ">
-                {isValidUserKey && (
-                  <Alert variant="default" className="mb-4">
-                    <KeyRound className="h-4 w-4" />
-                    <AlertTitle className="flex justify-between items-center">
-                      <span>Current Key (Settings)</span>
-                      <Button
-                        variant="destructive"
-                        size="sm"
-                        onClick={handleDeleteKey}
-                        disabled={isSaving}
-                        className="flex items-center gap-1 h-7 px-2"
-                      >
-                        <Trash2 className="h-4 w-4" />
-                        {isSaving ? "Deleting..." : "Delete"}
-                      </Button>
-                    </AlertTitle>
-                    <AlertDescription>
-                      <p className="font-mono text-sm">{userApiKey}</p>
-                      {activeKeySource === "settings" && (
-                        <p className="text-xs text-green-600 dark:text-green-400 mt-1">
-                          This key is currently active.
-                        </p>
-                      )}
-                    </AlertDescription>
-                  </Alert>
-                )}
-
-                <div className="space-y-2">
-                  <label
-                    htmlFor="apiKeyInput"
-                    className="block text-sm font-medium text-gray-700 dark:text-gray-300"
-                  >
-                    {isValidUserKey ? "Update" : "Set"} {providerDisplayName}{" "}
-                    API Key
-                  </label>
-                  <div className="flex items-start space-x-2">
-                    <Input
-                      id="apiKeyInput"
-                      value={apiKeyInput}
-                      onChange={(e) => setApiKeyInput(e.target.value)}
-                      placeholder={`Enter new ${providerDisplayName} API Key here`}
-                      className={`flex-grow ${
-                        saveError ? "border-red-500" : ""
-                      }`}
+          <ApiKeyConfiguration
+            provider={provider}
+            providerDisplayName={providerDisplayName}
+            settings={settings}
+            envVars={envVars}
+            envVarName={envVarName}
+            isSaving={isSaving}
+            saveError={saveError}
+            apiKeyInput={apiKeyInput}
+            onApiKeyInputChange={setApiKeyInput}
+            onSaveKey={handleSaveKey}
+            onDeleteKey={handleDeleteKey}
+            isDyad={isDyad}
           />
-                    <Button
-                      onClick={handleSaveKey}
-                      disabled={isSaving || !apiKeyInput}
-                    >
-                      {isSaving ? "Saving..." : "Save Key"}
-                    </Button>
-                  </div>
-                  {saveError && (
-                    <p className="text-xs text-red-600">{saveError}</p>
-                  )}
-                  <p className="text-xs text-gray-500 dark:text-gray-400">
-                    Setting a key here will override the environment variable
-                    (if set).
-                  </p>
-                </div>
-              </AccordionContent>
-            </AccordionItem>
-
-            {!isDyad && envVarName && (
-              <AccordionItem
-                value="env-key"
-                className="border rounded-lg px-4 bg-(--background-lightest)"
-              >
-                <AccordionTrigger className="text-lg font-medium hover:no-underline cursor-pointer">
-                  API Key from Environment Variable
-                </AccordionTrigger>
-                <AccordionContent className="pt-4">
-                  {hasEnvKey ? (
-                    <Alert variant="default">
-                      <KeyRound className="h-4 w-4" />
-                      <AlertTitle>
-                        Environment Variable Key ({envVarName})
-                      </AlertTitle>
-                      <AlertDescription>
-                        <p className="font-mono text-sm">
-                          {maskEnvApiKey(envApiKey)}
-                        </p>
-                        {activeKeySource === "env" && (
-                          <p className="text-xs text-green-600 dark:text-green-400 mt-1">
-                            This key is currently active (no settings key set).
-                          </p>
-                        )}
-                        {activeKeySource === "settings" && (
-                          <p className="text-xs text-yellow-600 dark:text-yellow-400 mt-1">
-                            This key is currently being overridden by the key
-                            set in Settings.
-                          </p>
-                        )}
-                      </AlertDescription>
-                    </Alert>
-                  ) : (
-                    <Alert variant="default">
-                      <Info className="h-4 w-4" />
-                      <AlertTitle>Environment Variable Not Set</AlertTitle>
-                      <AlertDescription>
-                        The{" "}
-                        <code className="font-mono bg-gray-100 dark:bg-gray-800 px-1 rounded text-xs">
-                          {envVarName}
-                        </code>{" "}
-                        environment variable is not set.
-                      </AlertDescription>
-                    </Alert>
-                  )}
-                  <p className="text-xs text-gray-500 dark:text-gray-400 mt-3">
-                    This key is set outside the application. If present, it will
-                    be used only if no key is configured in the Settings section
-                    above. Requires app restart to detect changes.
-                  </p>
-                </AccordionContent>
-              </AccordionItem>
-            )}
-          </Accordion>
         )}
 
         {isDyad && !settingsLoading && (
@@ -481,22 +279,13 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
             />
           </div>
         )}
+
+        {/* Conditionally render CustomModelsSection */}
+        {supportsCustomModels && providerData && (
+          <ModelsSection providerId={providerData.id} />
+        )}
+        <div className="h-24"></div>
       </div>
     </div>
   );
 }
-
-function getKeyButtonText({
-  isConfigured,
-  isDyad,
-}: {
-  isConfigured: boolean;
-  isDyad: boolean;
-}) {
-  if (isDyad) {
-    return isConfigured
-      ? "Manage Dyad Pro Subscription"
-      : "Setup Dyad Pro Subscription";
-  }
-  return isConfigured ? "Manage API Keys" : "Setup API Key";
-}

src/hooks/useCustomLanguageModelProvider.ts

@@ -1,15 +1,11 @@
 import { useMutation, useQueryClient } from "@tanstack/react-query";
 import { IpcClient } from "@/ipc/ipc_client";
-import type { LanguageModelProvider } from "@/ipc/ipc_types";
+import type {
+  CreateCustomLanguageModelProviderParams,
+  LanguageModelProvider,
+} from "@/ipc/ipc_types";
 import { showError } from "@/lib/toast";
 
-export interface CreateCustomLanguageModelProviderParams {
-  id: string;
-  name: string;
-  apiBaseUrl: string;
-  envVarName?: string;
-}
-
 export function useCustomLanguageModelProvider() {
   const queryClient = useQueryClient();
   const ipcClient = IpcClient.getInstance();

src/hooks/useLanguageModelsForProvider.ts

@@ -0,0 +1,29 @@
+import { useQuery } from "@tanstack/react-query";
+import { IpcClient } from "@/ipc/ipc_client";
+import type { LanguageModel } from "@/ipc/ipc_types";
+
+/**
+ * Fetches the list of available language models for a specific provider.
+ *
+ * @param providerId The ID of the language model provider.
+ * @returns TanStack Query result object for the language models.
+ */
+export function useLanguageModelsForProvider(providerId: string | undefined) {
+  const ipcClient = IpcClient.getInstance();
+
+  return useQuery<
+    LanguageModel[],
+    Error // Specify Error type for better error handling
+  >({
+    queryKey: ["language-models", providerId],
+    queryFn: async () => {
+      if (!providerId) {
+        // Avoid calling IPC if providerId is not set
+        // Return an empty array as it's a query, not an error state
+        return [];
+      }
+      return ipcClient.getLanguageModels({ providerId });
+    },
+    enabled: !!providerId,
+  });
+}

src/ipc/handlers/language_model_handlers.ts

@@ -1,22 +1,26 @@
-import type { LanguageModelProvider } from "@/ipc/ipc_types";
+import type {
+  LanguageModelProvider,
+  LanguageModel,
+  CreateCustomLanguageModelProviderParams,
+  CreateCustomLanguageModelParams,
+} from "@/ipc/ipc_types";
 import { createLoggedHandler } from "./safe_handle";
 import log from "electron-log";
-import { getLanguageModelProviders } from "../shared/language_model_helpers";
+import {
+  getLanguageModelProviders,
+  getLanguageModels,
+} from "../shared/language_model_helpers";
 import { db } from "@/db";
-import { language_model_providers as languageModelProvidersSchema } from "@/db/schema";
+import {
+  language_model_providers as languageModelProvidersSchema,
+  language_models as languageModelsSchema,
+} from "@/db/schema";
 import { eq } from "drizzle-orm";
 import { IpcMainInvokeEvent } from "electron";
 
 const logger = log.scope("language_model_handlers");
 const handle = createLoggedHandler(logger);
 
-export interface CreateCustomLanguageModelProviderParams {
-  id: string;
-  name: string;
-  apiBaseUrl: string;
-  envVarName?: string;
-}
-
 export function registerLanguageModelHandlers() {
   handle(
     "get-language-model-providers",
@@ -47,7 +51,7 @@ export function registerLanguageModelHandlers() {
       }
 
       // Check if a provider with this ID already exists
-      const existingProvider = await db
+      const existingProvider = db
         .select()
         .from(languageModelProvidersSchema)
         .where(eq(languageModelProvidersSchema.id, id))
@@ -75,4 +79,77 @@ export function registerLanguageModelHandlers() {
       };
     },
   );
+
+  handle(
+    "create-custom-language-model",
+    async (
+      event: IpcMainInvokeEvent,
+      params: CreateCustomLanguageModelParams,
+    ): Promise<void> => {
+      const {
+        id,
+        name,
+        providerId,
+        description,
+        maxOutputTokens,
+        contextWindow,
+      } = params;
+
+      // Validation
+      if (!id) {
+        throw new Error("Model ID is required");
+      }
+      if (!name) {
+        throw new Error("Model name is required");
+      }
+      if (!providerId) {
+        throw new Error("Provider ID is required");
+      }
+
+      // Check if provider exists
+      const provider = db
+        .select()
+        .from(languageModelProvidersSchema)
+        .where(eq(languageModelProvidersSchema.id, providerId))
+        .get();
+
+      if (!provider) {
+        throw new Error(`Provider with ID "${providerId}" not found`);
+      }
+
+      // Check if model ID already exists
+      const existingModel = db
+        .select()
+        .from(languageModelsSchema)
+        .where(eq(languageModelsSchema.id, id))
+        .get();
+
+      if (existingModel) {
+        throw new Error(`A model with ID "${id}" already exists`);
+      }
+
+      // Insert the new model
+      await db.insert(languageModelsSchema).values({
+        id,
+        name,
+        provider_id: providerId,
+        description: description || null,
+        max_output_tokens: maxOutputTokens || null,
+        context_window: contextWindow || null,
+      });
+    },
+  );
+
+  handle(
+    "get-language-models",
+    async (
+      event: IpcMainInvokeEvent,
+      params: { providerId: string },
+    ): Promise<LanguageModel[]> => {
+      if (!params || typeof params.providerId !== "string") {
+        throw new Error("Invalid parameters: providerId (string) is required.");
+      }
+      return getLanguageModels({ providerId: params.providerId });
+    },
+  );
 }

src/ipc/ipc_client.ts

@@ -22,6 +22,9 @@ import type {
   ChatLogsData,
   BranchResult,
   LanguageModelProvider,
+  LanguageModel,
+  CreateCustomLanguageModelProviderParams,
+  CreateCustomLanguageModelParams,
 } from "./ipc_types";
 import type { ProposalResult } from "@/lib/schemas";
 import { showError } from "@/lib/toast";
@@ -732,17 +735,18 @@ export class IpcClient {
     return this.ipcRenderer.invoke("get-language-model-providers");
   }
 
+  public async getLanguageModels(params: {
+    providerId: string;
+  }): Promise<LanguageModel[]> {
+    return this.ipcRenderer.invoke("get-language-models", params);
+  }
+
   public async createCustomLanguageModelProvider({
     id,
     name,
     apiBaseUrl,
     envVarName,
-  }: {
-    id: string;
-    name: string;
-    apiBaseUrl: string;
-    envVarName?: string;
-  }): Promise<LanguageModelProvider> {
+  }: CreateCustomLanguageModelProviderParams): Promise<LanguageModelProvider> {
     return this.ipcRenderer.invoke("create-custom-language-model-provider", {
       id,
       name,
@@ -751,5 +755,11 @@ export class IpcClient {
     });
   }
 
+  public async createCustomLanguageModel(
+    params: CreateCustomLanguageModelParams,
+  ): Promise<void> {
+    await this.ipcRenderer.invoke("create-custom-language-model", params);
+  }
+
   // --- End window control methods ---
 }

src/ipc/ipc_types.ts

@@ -143,3 +143,30 @@ export interface LanguageModelProvider {
   apiBaseUrl?: string;
   type: "custom" | "local" | "cloud";
 }
+
+export interface LanguageModel {
+  id: string;
+  name: string;
+  displayName: string;
+  description: string;
+  tag?: string;
+  maxOutputTokens?: number;
+  contextWindow?: number;
+  type: "local" | "cloud" | "custom";
+}
+
+export interface CreateCustomLanguageModelProviderParams {
+  id: string;
+  name: string;
+  apiBaseUrl: string;
+  envVarName?: string;
+}
+
+export interface CreateCustomLanguageModelParams {
+  id: string;
+  name: string;
+  providerId: string;
+  description?: string;
+  maxOutputTokens?: number;
+  contextWindow?: number;
+}

src/ipc/shared/language_model_helpers.ts

@@ -1,7 +1,11 @@
 import { db } from "@/db";
-import { language_model_providers as languageModelProvidersSchema } from "@/db/schema";
-import { RegularModelProvider } from "@/constants/models";
-import type { LanguageModelProvider } from "@/ipc/ipc_types";
+import {
+  language_model_providers as languageModelProvidersSchema,
+  language_models as languageModelsSchema,
+} from "@/db/schema";
+import { MODEL_OPTIONS, RegularModelProvider } from "@/constants/models";
+import type { LanguageModelProvider, LanguageModel } from "@/ipc/ipc_types";
+import { eq } from "drizzle-orm";
 
 export const PROVIDER_TO_ENV_VAR: Record<string, string> = {
   openai: "OPENAI_API_KEY",
@@ -129,3 +133,80 @@ export async function getLanguageModelProviders(): Promise<
 
   return Array.from(mergedProvidersMap.values());
 }
+
+/**
+ * Fetches language models for a specific provider.
+ * @param obj An object containing the providerId.
+ * @returns A promise that resolves to an array of LanguageModel objects.
+ */
+export async function getLanguageModels(obj: {
+  providerId: string;
+}): Promise<LanguageModel[]> {
+  const { providerId } = obj;
+  const allProviders = await getLanguageModelProviders();
+  const provider = allProviders.find((p) => p.id === providerId);
+
+  if (!provider) {
+    console.warn(`Provider with ID "${providerId}" not found.`);
+    return [];
+  }
+
+  if (provider.type === "cloud") {
+    // Check if providerId is a valid key for MODEL_OPTIONS
+    if (providerId in MODEL_OPTIONS) {
+      const models = MODEL_OPTIONS[providerId as RegularModelProvider] || [];
+      return models.map((model) => ({
+        ...model,
+        id: model.name,
+        type: "cloud",
+      }));
+    } else {
+      console.warn(
+        `Provider "${providerId}" is cloud type but not found in MODEL_OPTIONS.`,
+      );
+      return [];
+    }
+  } else if (provider.type === "custom") {
+    // Fetch models from the database for this custom provider
+    // Assuming a language_models table with necessary columns and provider_id foreign key
+    try {
+      const customModelsDb = await db
+        .select({
+          id: languageModelsSchema.id,
+          // Map DB columns to LanguageModel fields
+          name: languageModelsSchema.name,
+          // No display_name in DB, use name instead
+          description: languageModelsSchema.description,
+          // No tag in DB
+          maxOutputTokens: languageModelsSchema.max_output_tokens,
+          contextWindow: languageModelsSchema.context_window,
+        })
+        .from(languageModelsSchema)
+        .where(eq(languageModelsSchema.provider_id, providerId)); // Assuming eq is imported or available
+
+      return customModelsDb.map((model) => ({
+        ...model,
+        displayName: model.name, // Use name as displayName for custom models
+        // Ensure possibly null fields are handled, provide defaults or undefined if needed
+        description: model.description ?? "",
+        tag: undefined, // No tag for custom models from DB
+        maxOutputTokens: model.maxOutputTokens ?? undefined,
+        contextWindow: model.contextWindow ?? undefined,
+        type: "custom",
+      }));
+    } catch (error) {
+      console.error(
+        `Error fetching custom models for provider "${providerId}" from DB:`,
+        error,
+      );
+      // Depending on desired behavior, could throw, return empty, or return a specific error state
+      return [];
+    }
+  } else {
+    // Handle other types like "local" if necessary, currently ignored
+    console.warn(
+      `Provider type "${provider.type}" not handled for model fetching.`,
+    );
+    return [];
+  }
+}

src/preload.ts

@@ -5,6 +5,8 @@ import { contextBridge, ipcRenderer } from "electron";
 
 // Whitelist of valid channels
 const validInvokeChannels = [
+  "get-language-models",
+  "create-custom-language-model",
   "get-language-model-providers",
   "create-custom-language-model-provider",
   "chat:add-dep",