name: python-pep-authoring description: Draft, review, edit, or prepare Python Enhancement Proposals using the official python/peps repository rules. Use when working on PEP text, PEP metadata headers, PEP process/status decisions, reStructuredText PEP formatting, python/peps pull requests, or validation with check-peps.py, pre-commit, and local rendering.

Python PEP Authoring

Overview

Use this skill for Python Enhancement Proposal work that needs to follow the official python/peps repository, not generic Python code style. It covers PEP drafting, PEP review, metadata/header validation, reStructuredText formatting, repository checks, and contribution workflow.

The bundled references summarize the official python/peps repository at commit 63b05773e2b5e8355910df520e8cf319f70944be from 2026-06-28. When working inside a current checkout of github.com/python/peps, prefer the checkout's local files over these summaries.

Workflow

1. Classify the request:
2. New PEP draft or template creation.
3. Review of an existing PEP draft.
4. Change to an existing PEP.
5. Repository PR preparation, lint failure, or rendering issue.
6. Read the relevant reference before making detailed claims:
7. references/process-and-policy.md for PEP workflow, statuses, authorship, sponsors, review, and maintenance.
8. references/header-and-rst-rules.md for PEP 12 header order, metadata formats, PEP section template, and reST rules.
9. references/repo-validation.md for python/peps checkout commands, check-peps.py, pre-commit, spelling, and rendering.
10. If a live python/peps checkout is available, inspect local source files before editing:
11. peps/pep-0001.rst
12. peps/pep-0012.rst
13. peps/pep-0012/pep-NNNN.rst
14. CONTRIBUTING.rst
15. README.rst
16. check-peps.py
17. .pre-commit-config.yaml

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18. For a new PEP, make sure the draft has one focused proposal, a champion, the correct PEP type, Status: Draft, a sponsor if required, a valid discussion plan, and the PEP 12 template structure.
19. For edits to existing PEPs, check the status first. Draft PEPs are open to discussion and proposed modification; Accepted, Final, Rejected, Withdrawn, and Superseded PEPs are mainly historical documents and should not receive major content changes without a process reason.
20. For reviews, report concrete issues first with file/line references when available. Separate process blockers, metadata/header defects, reST/rendering defects, and editorial/content concerns.
21. For repository work, run the narrowest meaningful validation command available. Prefer python check-peps.py peps/pep-NNNN.rst for a single PEP, then make lint, make spellcheck, and make html or python build.py when appropriate.

New PEP Drafts

When asked to create or revise a new PEP:

• Use peps/pep-0012/pep-NNNN.rst as the source template if the official repo is present. Do not use rendered HTML as a template.
• Name the file peps/pep-NNNN.rst with zero padding. The PEP: header itself is not zero-padded.
• Use the next available PEP number not used by a published or in-PR PEP unless a PEP editor assigns a number.
• Include required headers in PEP 12 order and remove optional headers that do not apply.
• For Standards Track PEPs, include Python-Version when the feature targets a Python release; omit it for interoperability standards that initially live outside the stdlib.
• Add Discussions-To: Pending and Post-History: Pending only when the canonical thread does not exist yet; update them after the thread is created.
• Include the dual public domain / CC0-1.0-Universal copyright/license text.
• If the PEP has co-authors or sponsors with write access to python/peps, update .github/CODEOWNERS.

Review Output

Use this structure for PEP reviews:

Findings
- [P1] Missing sponsor for non-core authors - peps/pep-NNNN.rst:4
  Explain the official rule, why it blocks or weakens the PEP, and the smallest fix.

Open Questions
- Mention only questions that affect process, metadata, or content readiness.

Validation
- List commands run and whether rendering/linting passed.

Use priorities consistently:

• P0: would break rendering, validation, or repository acceptance outright.
• P1: process or metadata issue likely to block PEP editor approval.
• P2: clear PEP 1/PEP 12/repo-rule issue that should be fixed.
• P3: editorial polish, clarity, or optional improvement.

If there are no findings, say that directly and mention any validation not run.

Source Links

• Official repository: https://github.com/python/peps
• PEP index: https://peps.python.org/
• PEP 1: https://peps.python.org/pep-0001/
• PEP 12: https://peps.python.org/pep-0012/