fix: use actual tool description instead of type (#146)

Author: bebiksior

src/chat/index.test.ts

@@ -438,6 +438,7 @@ describe('doGenerate', () => {
         {
           type: 'function',
           name: 'test-tool',
+          description: 'Test tool',
           inputSchema: {
             type: 'object',
             properties: { value: { type: 'string' } },
@@ -461,7 +462,7 @@ describe('doGenerate', () => {
           type: 'function',
           function: {
             name: 'test-tool',
-            description: 'function',
+            description: 'Test tool',
             parameters: {
               type: 'object',
               properties: { value: { type: 'string' } },

src/chat/index.ts

@@ -167,7 +167,7 @@ export class OpenRouterChatLanguageModel implements LanguageModelV2 {
           type: 'function' as const,
           function: {
             name: tool.name,
-            description: tool.type,
+            description: tool.description,
             parameters: tool.inputSchema,
           },
         }));