fix: trust vip98k published image contracts

lib/ai/vip98k-models.ts

@@ -381,6 +381,13 @@ function hasMediaReferenceInput(
           modelId,
         );
 
+  // The V2 invocation contract is the executable source of truth. Authorized
+  // catalog metadata can advertise broad multimodal capability even when the
+  // published request body only accepts a text prompt.
+  if (type === "image" && getInvocationCandidates(model).length > 0) {
+    return hasMediaRequestField;
+  }
+
   return (
     hasMediaCapability ||
     inputModes.some((mode) => mediaInputModes.has(mode)) ||
@@ -389,6 +396,17 @@ function hasMediaReferenceInput(
   );
 }
 
+function hasMultiImageReferenceInput(model: Vip98kCatalogModel) {
+  const multiImageKeys = new Set([
+    "file-urls",
+    "images",
+    "image-urls",
+    "reference-images",
+    "video-clips",
+  ]);
+  return getInvocationRequestKeys(model).some((key) => multiImageKeys.has(key));
+}
+
 export function isVip98kCatalogModelAvailable(model: Vip98kCatalogModel) {
   const status = String(model.status || "").trim().toLowerCase();
   if (UNAVAILABLE_STATUS_TOKENS.some((token) => status.includes(token))) {
@@ -598,6 +616,7 @@ function createImagePreset(
   const supportedImageSizes = getSupportedImageSizes(model);
   const invocationKeys = new Set(getInvocationRequestKeys(model));
   const supportsReferenceImages = hasMediaReferenceInput(model, "image");
+  const supportsMultiImageReference = hasMultiImageReferenceInput(model);
   const supportsNativeSize = [
     "size",
     "image-size",
@@ -615,7 +634,11 @@ function createImagePreset(
       : []),
     ...(supportsReferenceImages ? ["image-to-image", "reference-images"] : []),
   ];
-  const maxReferenceImages = supportsReferenceImages ? 8 : 0;
+  const maxReferenceImages = supportsMultiImageReference
+    ? 8
+    : supportsReferenceImages
+      ? 1
+      : 0;
   const defaultImageSize =
     supportedImageSizes.find((size) => size === "2K") ||
     supportedImageSizes[0] ||
@@ -642,7 +665,7 @@ function createImagePreset(
       supportedAspectRatios: supportsNativeAspectRatio
         ? [...DEFAULT_ASPECT_RATIOS]
         : ["auto"],
-      supportsMultiImageReference: supportsReferenceImages,
+      supportsMultiImageReference,
       maxReferenceImages,
       vip98k: getVip98kMetadata(model, "image"),
     },

tests/routes/vip98k-reference-routing.test.ts

@@ -258,4 +258,28 @@ test.describe("VIP98K reference-image routing", () => {
 
     expect(preset).toBeUndefined();
   });
+
+  test("does not inherit multi-image support from broad authorized metadata", () => {
+    const presets = buildVip98kModelPresets([
+      {
+        id: "nano-banana-2-lite",
+        type: "image",
+        capabilities: ["text_to_image", "image_to_image"],
+        inputModes: ["text", "image"],
+        invocation: {
+          kind: "tool",
+          method: "POST",
+          path: "/v1/images/generations",
+          content_type: "application/json",
+          request_example: {
+            model: "nano-banana-2-lite",
+            n: 1,
+            prompt: "Generate",
+          },
+        },
+      },
+    ]);
+
+    expect(presets).toEqual([]);
+  });
 });