fix(ai): route vip98k image tools correctly

lib/ai/providers/vip98k.ts

@@ -650,6 +650,15 @@ function buildTaskBody(params: Vip98kTaskParams, invocation: Vip98kInvocation |
     if ("negativePrompt" in body || !invocation) body.negativePrompt = negativePrompt;
     if ("negative_prompt" in body || !invocation) body.negative_prompt = negativePrompt;
   }
+  const imageToolParamAliases = [
+    ["scaleFactor", "scale_factor"],
+    ["xScale", "x_scale"],
+    ["yScale", "y_scale"],
+  ] as const;
+  for (const [sourceKey, targetKey] of imageToolParamAliases) {
+    const value = imageParams[sourceKey];
+    if (value !== undefined && targetKey in body) body[targetKey] = value;
+  }
   if (typeof videoParams.generateAudio === "boolean") {
     if ("generateAudio" in body || !invocation) body.generateAudio = videoParams.generateAudio;
     if ("generate_audio" in body || !invocation) body.generate_audio = videoParams.generateAudio;

lib/ai/vip98k-task-invocation.ts

@@ -16,6 +16,14 @@ const KNOWN_IMAGE_TOOL_INPUTS: Record<string, KnownImageInput> = {
   "openai/gpt-image-2/edit": "images",
 };
 
+const KNOWN_IMAGE_PROCESSING_TOOL_REQUESTS: Record<
+  string,
+  Record<string, unknown>
+> = {
+  "remove-background": { image_url: "" },
+  enhance: { image_url: "", scale_factor: 4 },
+};
+
 function getInvocationToolId(invocation: Vip98kTaskInvocation | null) {
   if (!invocation || invocation.kind !== "tool") return null;
   const query = invocation.path.split("?", 2)[1] || "";
@@ -46,6 +54,22 @@ function createKnownImageToolInvocation(
   };
 }
 
+function createKnownProcessingToolInvocation(
+  modelId: string,
+  requestExample: Record<string, unknown>
+): Vip98kTaskInvocation {
+  const encodedModelId = encodeURIComponent(modelId);
+  return {
+    kind: "tool",
+    method: "POST",
+    path: `/api/external/tools/generate?tool_id=${encodedModelId}`,
+    contentType: "application/json",
+    requestExample: { ...requestExample },
+    resultMethod: "GET",
+    resultPath: `/api/external/tools/result?tool_id=${encodedModelId}&taskId={task_id}`,
+  };
+}
+
 /**
  * A frontend alias may resolve to a different VIP98K tool at runtime. In that
  * case the selected model's invocation cannot be reused because its endpoint
@@ -56,6 +80,14 @@ export function resolveVip98kTaskInvocation(
   configuredInvocation: Vip98kTaskInvocation | null
 ) {
   const normalizedModelId = modelId.trim().toLowerCase();
+  const processingRequest = KNOWN_IMAGE_PROCESSING_TOOL_REQUESTS[normalizedModelId];
+  if (processingRequest) {
+    if (getInvocationToolId(configuredInvocation)?.toLowerCase() === normalizedModelId) {
+      return configuredInvocation;
+    }
+    return createKnownProcessingToolInvocation(modelId, processingRequest);
+  }
+
   const knownImageInput = KNOWN_IMAGE_TOOL_INPUTS[normalizedModelId];
   if (!knownImageInput) return configuredInvocation;
 

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

@@ -59,4 +59,28 @@ test.describe("VIP98K reference-image routing", () => {
       resolveVip98kTaskInvocation("other/image-model", textToImageInvocation)
     ).toBe(textToImageInvocation);
   });
+
+  test("routes remove-background through the dedicated external tool", () => {
+    const invocation = resolveVip98kTaskInvocation("remove-background", null);
+
+    expect(invocation?.path).toBe(
+      "/api/external/tools/generate?tool_id=remove-background"
+    );
+    expect(invocation?.resultPath).toBe(
+      "/api/external/tools/result?tool_id=remove-background&taskId={task_id}"
+    );
+    expect(invocation?.requestExample).toEqual({ image_url: "" });
+  });
+
+  test("routes enhance through the dedicated external tool", () => {
+    const invocation = resolveVip98kTaskInvocation("enhance", null);
+
+    expect(invocation?.path).toBe(
+      "/api/external/tools/generate?tool_id=enhance"
+    );
+    expect(invocation?.requestExample).toEqual({
+      image_url: "",
+      scale_factor: 4,
+    });
+  });
 });