Add main tool handler files

src/tool-handlers/validate-model.ts

@@ -0,0 +1,50 @@
+import { ModelCache } from '../model-cache.js';
+
+export interface ValidateModelToolRequest {
+  model: string;
+}
+
+export async function handleValidateModel(
+  request: { params: { arguments: ValidateModelToolRequest } },
+  modelCache: ModelCache
+) {
+  const args = request.params.arguments;
+  
+  try {
+    if (!modelCache.isCacheValid()) {
+      return {
+        content: [
+          {
+            type: 'text',
+            text: 'Model cache is empty or expired. Please call search_models first to populate the cache.',
+          },
+        ],
+        isError: true,
+      };
+    }
+    
+    const isValid = modelCache.hasModel(args.model);
+    
+    return {
+      content: [
+        {
+          type: 'text',
+          text: JSON.stringify({ valid: isValid }),
+        },
+      ],
+    };
+  } catch (error) {
+    if (error instanceof Error) {
+      return {
+        content: [
+          {
+            type: 'text',
+            text: `Error validating model: ${error.message}`,
+          },
+        ],
+        isError: true,
+      };
+    }
+    throw error;
+  }
+}