Ensure gen_ai.chat spans contain sensible data for gen_ai.response.tool_calls

Author: nicohrubec

dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

@@ -179,7 +179,7 @@ describe('LangChain integration', () => {
           'gen_ai.response.id': expect.any(String),
           'gen_ai.response.model': expect.any(String),
           'gen_ai.response.stop_reason': 'tool_use',
-          'gen_ai.response.tool_calls': expect.any(String),
+          'gen_ai.response.tool_calls': expect.stringContaining('get_weather'),
         }),
         description: 'chat claude-3-5-sonnet-20241022',
         op: 'gen_ai.chat',