Quality: SingleResult dataclass fields default to None but typed as non-Optional — will crash on attribute access

[kumburovicbranko682-boop]

✨ Code Quality

Problem

The SingleResult dataclass declares example: Example and result: RunResult but defaults both to None. The # type: ignore[assignment] silences the type checker but does not fix the runtime problem: any code that constructs SingleResult() without explicitly setting both fields and then accesses sr.example.name or sr.result.exit_code will crash with AttributeError: 'NoneType' object has no attribute 'name'. The sibling class RunResult demonstrates the correct pattern — every field has a concrete default. Example requires three non-defaulted args (name, path, cwd), so the author punted with None. Callers have no type-level signal that these fields can be absent.

Severity: high
File: sdk/python/validation/models.py

Solution

from typing import Optional

@DataClass
class SingleResult:
"""Result of running one example with one model (single-run mode)."""

example: Optional[Example] = None
result: Optional[RunResult] = None

Then guard all consumers:

if single_result.example is not None:

...

Changes

• sdk/python/validation/models.py (modified)

Testing

• Existing tests pass
• Manual review completed
• No new warnings/errors introduced

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Closes #287