Python typing without TYPE_CHECKING

This skill defines hard rules and preferred patterns for writing typed Python code without ever using from typing import TYPE_CHECKING or if TYPE_CHECKING: blocks. It applies to all Python code the agent creates or edits unless the user explicitly overrides this style for a specific file.

For detailed examples and design rationale, consult the bundled reference references/python-module-design-without-type-checking.md.

Non‑negotiable rules

Follow these rules strictly unless the user explicitly instructs otherwise.

1. Never import TYPE_CHECKING.
   • Do not write from typing import TYPE_CHECKING.
   • Do not rely on typing.TYPE_CHECKING or any alias of it.
   • Do not introduce TYPE_CHECKING = False or similar "shadow" variables as an alternative.