Fix isinstance union usage in agents-api

[HamadaSalhab]

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Summary

• fix isinstance checks that used | operator
• adjust evaluator and task validation helpers

Testing

• ruff format agents-api/agents_api/queries/utils.py agents-api/agents_api/common/utils/evaluator.py agents-api/agents_api/activities/task_steps/base_evaluate.py agents-api/agents_api/web.py agents-api/agents_api/workflows/task_execution/__init__.py agents-api/agents_api/common/utils/expressions.py agents-api/agents_api/common/utils/task_validation.py
• ruff check agents-api/agents_api/queries/utils.py agents-api/agents_api/common/utils/evaluator.py agents-api/agents_api/activities/task_steps/base_evaluate.py agents-api/agents_api/web.py agents-api/agents_api/workflows/task_execution/__init__.py agents-api/agents_api/common/utils/expressions.py agents-api/agents_api/common/utils/task_validation.py
• pip install pytype (fails: no network access)

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PR Type

Bug fix

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Description

• Fix incorrect usage of isinstance with union types

  • Replace isinstance(x, A | B) with isinstance(x, (A, B))
  • Update all affected files for compatibility

• Improve type safety and error handling in evaluators and validators

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Changes walkthrough 📝

Relevant files

Bug fix

7 files base_evaluate.py Fix isinstance usage for numeric types in evaluator            +1/-1      evaluator.py Correct isinstance check for population types                        +1/-1      expressions.py Update isinstance for numeric and None checks                        +1/-1      task_validation.py Fix isinstance for comprehension node types                            +1/-1      utils.py Correct isinstance for list and tuple serialization            +1/-1      web.py Fix isinstance for validation error handling                          +1/-1      __init__.py Update isinstance for cancellation error types                      +1/-1

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[!IMPORTANT] Fix isinstance checks using | operator to use tuples for compatibility in agents-api module.

• Behavior:
  • Fix isinstance checks using | operator to use tuples for compatibility in base_evaluate.py, evaluator.py, and web.py.
• Validation:
  • Adjust validate_py_expression() in task_validation.py to use tuples in isinstance checks.
• Misc:
  • Run ruff for formatting and linting on affected files.
  • Attempted pytype installation failed due to no network access.

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