Another Python test fix

Author: SteveSandersonMS

python/e2e/test_multi_client.py

@@ -336,7 +336,8 @@ async def test_two_clients_register_different_tools_and_agent_uses_both(self, mc
         """Two clients register different tools and agent uses both."""
 
         class CountryCodeParams(BaseModel):
-            country_code: str = Field(description="A two-letter country code")
+            model_config = {"populate_by_name": True}
+            country_code: str = Field(alias="countryCode", description="A two-letter country code")
 
         @define_tool("city_lookup", description="Returns a city name for a given country code")
         def city_lookup(params: CountryCodeParams, invocation: ToolInvocation) -> str:
@@ -359,7 +360,7 @@ def currency_lookup(params: CountryCodeParams, invocation: ToolInvocation) -> st
 
         # Send prompts sequentially to avoid nondeterministic tool_call ordering
         await session1.send(
-            {"prompt": "Use the city_lookup tool with country_code 'US' and tell me the result."}
+            {"prompt": "Use the city_lookup tool with countryCode 'US' and tell me the result."}
         )
         response1 = await get_final_assistant_message(session1)
         assert "CITY_FOR_US" in (response1.data.content or "")
@@ -368,7 +369,7 @@ def currency_lookup(params: CountryCodeParams, invocation: ToolInvocation) -> st
             {
                 "prompt": (
                     "Now use the currency_lookup tool with"
-                    " country_code 'US' and tell me the result."
+                    " countryCode 'US' and tell me the result."
                 )
             }
         )