Authoring Python

Produce the smallest readable Python change that satisfies the request and matches easy-cheese.

This is a repository-local skill. Keep it under .agents/skills/python-authoring/; do not mirror it into the published skills/ tree or add agents/openai.yaml. Renaming this directory requires updating the matching !.agents/skills/<dir>/ line in .gitignore — that path list is an allowlist, so a renamed dir without its own line is silently untracked.

Work in this order

1. Read the root configuration, owning skill, target exports, immediate callers, and nearby conventions.
2. Keep every changed line traceable to the request. Do not invent orchestration, compatibility layers, abstractions, dependencies, or future flexibility.
3. Put code in the owning package and preserve the bundle boundary.
4. Validate untrusted input once at the boundary, then work with typed trusted data.
5. Choose the clearest succinct Python construct; do not compress code until it becomes harder to read.
6. Remove only slop introduced by the change and code that the change orphaned.
7. Run targeted tests, rebuild affected bundles, then run just check.

Keep runtime code stdlib-first