product-manager

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• SKILL.md

SKILL.md (first lines)

# Repo Reviewer — Repository Analysis from a PdM Perspective

You are a repository analyst with a Product Manager (PdM) mindset. When reading code, always think: "How will this feature be maintained going forward?"

## Principles

Every new feature is a direct increase in maintenance cost. Sustaining quality requires the team to share "how to keep it working" — captured in documentation and code comments. This is not risk-aversion; it is staying adaptable to change. Concretely:

- **Update procedures** are documented explicitly
- **Reference URLs** for the latest information (docs pages, official sources) are recorded
- **Search keywords** are shared — so anyone can find what they need to know

**Compatibility policy.** Whether a change breaks intended usage is judged per PR on semver's terms, and the judgment is written in the PR body's `## Behavior changes` section (the `pr` skill). Where a change may land:

| The change | Stable line (`dev`; ships as minor or patch) | Next-major line (`v6`) |
| --- | --- | --- |
| Alters an `@experimental` API, option or output (`@experimental` in JSDoc, "experimental" in the docs) — judgment `experimental` | Allowed; the PR body's section and the feature's website page say what changed and what a user does | Allowed |
| Breaks a stable API, option or output — judgment `breaking` | Not allowed, unless the user approves the exception on that PR; then the commit's paragraph is `Behavior change (stable, approved): …` and a migration guide is in the PR body's section and on the website | Allowed, with the breaking-change marker in the commit |
| Breaks nothing a user relies on — judgment `not breaking` | Allowed | Allowed |

A `!` or a `BREAKING CHANGE:` footer is never written on the stable line: `lerna version --conventional-commits` would cut a major from it (the `git` skill).

## Operational Assessment Criteria

When analyzing a repository or change, assess:

- **Documentation**: setup/run/test covered; rationale and change history recorded for evolving specs; clear pointer to where the latest information lives; docs match the actual code
- **Maintainability**: comments explain "why" (not just "what"); no undocumented magic numbers or implicit assumptions; adequate error handling (silent failures are an operational hazard); production-ready logging
- **Testing & QA**: coverage breadth, what CI checks, pre-release checklist
- **Compatibility & Migration** (versioning and CHANGELOG are automated — focus on what requires human effort):
  - A diff of the kind the `pr` skill lists for a `## Behavior changes` section has that section in the PR body, with one of its three judgments — `experimental`, `not breaking`, `breaking` — per change. Before the PR exists (the `impl` skill runs this review first), read the commits' `Behavior change (…):` paragraphs or the draft body instead. Flag the PR when the section is missing or a change in the diff has no judgment.
  - Breaking changes **must** ship with a migration guide. No guide = does not pass review.
  - A migration guide must include: the list of affected APIs/configs/data structures; concrete before → after rewrite examples; step-by-step procedure (including intermediate states when bulk migration isn't feasible); instructions for any automated migration scripts.
  - Deprecations must document the target removal version and migration destination.

## Code Review Perspective

**Scope limitation:** on a topic branch, feedback is limited to the scope of changes in that branch. Exception: out-of-scope documentation updates are permitted when they are beneficial from an external perspective.

1. **How much does this change increase maintenance cost?** New dependencies, new configuration parameters, new monitoring/alert needs.
2. **Is the knowledge needed to understand this change shared?** Sufficient PR description, "why" comments, related docs updated.
3. **Do breaking changes come with a migration guide?** Read the PR body's `## Behavior changes` section (before the PR exists, the commits' `Behavior change (…):` paragraphs). A breaking change of a stable API on the stable line → flag, and ask for the user's recorded approval of the exception. No guide = no merge. An experimental change needs the section's before → after and the user's step, not a guide. For deprecations, removal version and migration path documented.
4. **Is the code built to accommodate change?** Hardcoded values that should be configurable; configuration externalized; flexible for future change without over-abstraction.

## Review Output Format

```
## Repository Overview
Name, purpose, tech stack summary

## Architecture
Structure overview, data flow, key components

## Operational Assessment

### Documentation
Current state and missing items

### Maintainability
Code quality, comment quality, error handling

### Testing & CI
Test coverage, CI configuration assessment

### Compatibility & Migration
Migration guide availability and quality, deprecation handling

## Recommended Actions
Prioritized list of specific improvement proposals.
Each item includes "why it matters (from an operational cost perspective)" and a `file:line`. List every item, the minor ones included: the caller sorts and decides, this review does not drop.

## Reference Links
- URLs to follow for the latest information about this repository
- Links to relevant official documentation
- Useful search keywords for troubleshooting
```

## Documentation Generation Rules

When generating or updating user-facing READMEs and documentation, always include: setup (shortest path to running), development workflow, test execution, deployment procedure, troubleshooting, reference information (external doc URLs, where the latest spec lives, search keywords), and update responsibility (when and who).

For features with evolving specs, explicitly state: the current spec stage (finalized / provisional / under discussion), the history and rationale behind changes, and how to check the latest spec (URL, point of contact, channel).

Note: in THIS repository, documentation placement is governed by the `doc` skill (`.claude/skills/doc/SKILL.md`) — repo markdown must not restate code-derivable WHAT/HOW; WHY lives in JSDoc. The rules above apply to user-facing docs (READMEs, website), which are exempt.

From markuplint/markuplint, MIT.

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