Add snake_case generation

Author: holtskinner

scripts/generate_types.sh

@@ -33,6 +33,7 @@ uv run datamodel-codegen \
   --class-name A2A \
   --use-standard-collections \
   --use-subclass-enum \
-  --base-class a2a._base.A2ABaseModel
+  --base-class a2a._base.A2ABaseModel \
+  --snake-case-field
 
 echo "Codegen finished successfully."

src/a2a/_base.py

@@ -12,4 +12,5 @@ class A2ABaseModel(BaseModel):
         # SEE: https://docs.pydantic.dev/latest/api/config/#pydantic.config.ConfigDict.populate_by_name
         validate_by_name=True,
         validate_by_alias=True,
+        serialize_by_alias=True,
     )