"""Base Pydantic models for common response patterns."""
from datetime import datetime, timezone
from typing import Optional, Union
from pydantic import BaseModel, Field, field_serializer
def _utc_now() -> datetime:
"""Generate UTC timestamp for responses."""
return datetime.now(timezone.utc)
class BaseResponse(BaseModel):
"""Base response model for all MCP tool responses."""
success: bool = Field(
default=True, description="Whether the operation was successful"
)
timestamp: datetime = Field(
default_factory=_utc_now, description="Response timestamp"
)
@field_serializer("timestamp")
def serialize_timestamp(self, timestamp: datetime) -> str:
"""Serialize timestamp to RFC3339 format for MCP compliance."""
if timestamp.tzinfo is None:
# If somehow we get a naive datetime, assume UTC
timestamp = timestamp.replace(tzinfo=timezone.utc)
# Use isoformat() which produces RFC3339 compliant format
# For UTC times, replace '+00:00' with 'Z' as preferred by many systems
iso_string = timestamp.isoformat()
if iso_string.endswith("+00:00"):
return iso_string[:-6] + "Z"
return iso_string
class IdResponse(BaseResponse):
"""Response model for operations that return a new ID."""
id: Union[int, str] = Field(description="ID of the created or affected resource")
class StatusResponse(BaseResponse):
"""Response model for operations that return just a status."""
status_code: Optional[int] = Field(None, description="HTTP status code")
message: Optional[str] = Field(None, description="Status message")