astro-pr-writer

name	astro-pr-writer
description	Write and update Astro pull requests with reviewer-friendly titles and high-signal bodies. Trigger whenever the user asks to create a PR, open a PR, draft a PR, update PR title/body, or write PR notes/summary/description.

Astro PR Writer

Write Astro pull request descriptions that help reviewers quickly understand intent, behavior changes, and validation.

Use this skill whenever the user asks for any PR-writing task, including:

• create/open a pull request
• create/open a draft pull request
• update a PR title
• update a PR body/description
• write PR notes/summary

Core Principle

Describe the change, how it works, and why it matters.

• Changes explains what the fix/feature does.
• Testing lists what test code was added or changed.
• Docs explains whether user-facing docs changes are needed.

Do not use PR sections as a task log.

PR Title Rules

Use a human, reviewer-friendly title.

• Describe the outcome in plain language.
• Keep it concise and specific.
• Prefer phrasing a person would naturally write in a review queue.

Do not use:

• conventional commit prefixes in PR titles (fix:, feat:, docs:, etc.)
• scoped commit-style titles (fix(cloudflare): ...)

Body Rules

Use this structure:

## Changes

- <Behavior change and why it matters>
- <Implementation detail and impact>

## Testing

- <New or changed test and what it covers>
- <Why an existing assertion changed>

## Docs

- <No docs update needed, because ...>

Changes

Focus on behavior, implementation approach, and impact.

Include:

• what now works that did not work before
• how the fix/feature works (reviewer-useful level)
• user-facing reliability/compatibility/perf behavior changes

Do not include:

• "added test" or "updated fixture" (belongs in Testing)
• "added changeset"
• internal process notes with no behavior impact

Testing

List what test code was added or changed, and why. Reviewers read this section to understand test coverage changes — not to hear that you ran a test suite.

Include:

• new test files or test cases added, with a short description of what they cover
• existing tests that were updated, and why the assertion changed

Do not include:

• that tests pass (CI shows this; it's noise)
• which commands you ran
• how many tests passed

Docs

Explain docs impact clearly.

• If docs are not needed, say why in one sentence.
• If docs are needed, link the docs PR.

Brevity Guidance

Default to short. 1-2 bullets per section is normal — add more only when the change is genuinely complex. A reviewer scanning a PR queue should be able to read the whole body in under 30 seconds for a typical patch.

Too verbose:

• Moves .optional().prefault({}) outside z.preprocess() for the server config property in both base.ts and relative.ts, matching the integrations fix from #16531. Zod 4.4.0 rejects missing properties wrapped in z.preprocess() before the preprocessor or inner defaults can execute — moving .optional().prefault({}) outside the preprocess call resolves this. Fixes the server property issue reported there by @rururux.
• Adds invalid_key, invalid_element, and discriminated union options handlers to both Astro and DB error maps for Zod 4.4.0 compatibility. Zod 4.4.0 surfaces record key refinement failures (e.g. env schema variable names) as structured invalid_key issues with nested errors instead of a flat message. The handlers extract the actual refinement message for clear user-facing errors.
• All changes are backward-compatible with Zod 4.3.x. New error map branches only activate on issue codes that 4.4.0 starts emitting.

Better:

• Moves .optional().prefault({}) outside z.preprocess() for the server config, matching the integrations fix from #16531. Fixes the issue reported there by @rururux.
• Adds invalid_key, invalid_element, and discriminated union options handlers to both error maps for Zod 4.4.0 compat.
• Backward-compatible with Zod 4.3.x.

Changesets

Every PR that modifies a package requires a changeset. Only examples/* changes are exempt.

Load the changeset skill to create the changeset file and write the message. It covers file creation, format, bump types, and message conventions.

When writing the PR body:

• Before posting, check whether a changeset exists. If the PR modifies a package and none exists, create it now using the changeset skill — do not post the PR without one.
• Do not mention "added changeset" in the Changes section — it is process noise, not a behavior change

Self-Check Before Posting

• Title is reviewer-friendly (not commit-style)
• Changes bullets describe behavior/implementation/impact
• Testing lists test code added/changed, not test run results
• Docs decision is explicit
• Changeset file exists in .changeset/ for any package-modifying PR — if missing, create it before posting