chore: update template files to use modern type annotations

[hobostay]

Summary

Update crew template files to use built-in types (list) instead of importing from typing module (List), following modern Python 3.10+ best practices (PEP 585).

Changes

lib/crewai/src/crewai/cli/templates/crew/crew.py

• Removed from typing import List
• Changed List[BaseAgent] → list[BaseAgent]
• Changed List[Task] → list[Task]

lib/crewai/src/crewai/cli/templates/flow/crews/poem_crew/poem_crew.py

• Removed from typing import List
• Changed List[BaseAgent] → list[BaseAgent]
• Changed List[Task] → list[Task]

Rationale

Since the project requires Python 3.10+ (requires-python = ">=3.10,<3.14" in pyproject.toml), using built-in generic types (list[T]) instead of imported types from typing (List[T]) is:

✅ More modern - Follows PEP 585 (Python 3.9+)
✅ Cleaner code - Removes unnecessary imports
✅ Future-proof - Aligns with current Python best practices
✅ Consistent - Many Python projects have already adopted this style

Impact

• Scope: Only affects template files used for generating new crews
• Risk: Low - Existing code is unaffected; only newly generated crews will use the modern syntax
• Compatibility: All syntax is valid in Python 3.10+

Example

Before:

from typing import List

agents: List[BaseAgent]
tasks: List[Task]

After:

agents: list[BaseAgent]
tasks: list[Task]

🤖 Generated with Claude Code

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Note

Low Risk
Only adjusts type annotations in scaffolding templates (no functional logic changes); risk is limited to Python-version compatibility, which is already 3.10+.

Overview
Updates the CLI crew templates to use PEP 585 built-in generics by removing typing.List imports and changing agents/tasks annotations from List[...] to list[...] in crew.py and poem_crew.py.

This is a template-only modernization for newly generated projects and does not change runtime behavior.

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[greysonlalonde]

@hobostay thanks! this is highly appreciated