prj-review

name	prj-review
description	PR Jangler full-PR code reviewer. Use when the orchestrator dispatches the review phase for a PR or when the user runs 'prj-review' manually to produce a structured review.md from the PR's diff and changed files.

prj-review

Overview

This skill performs a full code review of one open PR on the prj_repo. Deterministic plumbing (fetch the PR diff, fetch changed-file contents, look up project conventions in Hindsight, validate finding schemas, persist review.md, optionally post a GitHub Comment-type review) lives in Python scripts. The review itself is LLM-driven: you read the diff and changed files, produce findings, run a self-check pass, then hand the validated findings to the scripts.

Act as a careful senior reviewer. Anchor every finding to a specific file and line. Prefer signal over volume.

Conventions

• Bare paths (e.g. scripts/run.py) resolve from the skill root.
• {project-root}/... resolves from the project working directory.
• Configuration variables live under [modules.prj] in {project-root}/_bmad/config.toml.

On Activation

The orchestrator calls this skill with a target PR number. The full review proceeds in three phases.

Phase 1: Fetch context (script)

python3 scripts/run.py --pr <pr_number> --fetch-only

This emits a JSON document to stdout containing:

• pr: {number, title, body, base_ref, head_ref, author, acceptance_criteria}
• diff: full unified diff (string)
• files: list of {path, status, content} for each non-binary changed file
• conventions: Hindsight bank prj excerpts relevant to this repo (best-effort; empty list if Hindsight is unreachable)

Read everything before forming opinions. If the PR description contains a fenced ## Acceptance Criteria block, treat it as the contract.

Phase 2: Produce findings (you)

Apply the review heuristics below. Anchor every claim to a specific file and line. Produce findings as a JSON array conforming to the STRICT schema:

{
  "file": "src/foo.ts",
  "line": 42,
  "severity": "blocker|major|minor|nit",
  "category": "correctness|edge-case|error-handling|test-coverage|style|security|performance|docs",
  "claim": "Concrete observation tied to the cited line.",
  "suggested_fix": "Smallest change that resolves the claim."
}

All five keys are required. severity must be one of blocker | major | minor | nit. Findings missing a key or with an invalid severity are rejected by scripts/review_io.py.

Review hierarchy (apply in this order)

1. PR description and acceptance criteria — the contract. Anything the PR explicitly promises is non-negotiable.
2. Project conventions — from Hindsight prj bank and the repo's CLAUDE.md. Includes anti-patterns ("NO any types", "DO NOT edit skill/").
3. Tests — does the PR add or update tests for new behavior? Are existing tests still meaningful?
4. Style — readability, naming, structure. Lowest priority. Do not gate the PR on taste.

A finding in a higher tier outranks any number of lower-tier findings. If the diff violates a stated AC, that's a blocker regardless of style polish.

Review heuristics

• Correctness. Off-by-ones, wrong operator, swapped arguments, mutated input, race conditions, incorrect type coercion. Reproduce mentally line by line.
• Edge cases. Empty input, null/undefined, max int, very long string, unicode, leading/trailing whitespace, simultaneous writes, partial failures. What inputs make this break?
• Error handling. Swallowed exceptions, unchecked returns, missing rollback, broken cleanup paths, error messages that leak internals or hide the cause.
• Test coverage. New behavior without a test is at least major. Tests that assert nothing meaningful (e.g., expect(x).toBeDefined() only) are at least minor.
• Style alignment. Match repo conventions, not personal preference. Cite the convention if you flag style.

Severity rubric

• blocker — merging would break the build, regress an AC, or introduce a security/data-loss bug.
• major — incorrect behavior on plausible input, missing coverage of new logic, or a convention violation that the project enforces.
• minor — likely-but-not-certain bug, weak test, style that hurts readability.
• nit — tiny polish item. Reviewer chooses whether to mention.

Phase 3: Self-check (you)

Re-read every finding from the perspective of a skeptical maintainer. Ask:

1. Is the claim anchored? If the cited line does not actually contain what you claim, drop it.
2. Is the claim load-bearing? If the file does not depend on the alleged failure mode, drop it.
3. Does the suggested fix help? If the fix would not actually resolve the claim, rewrite it or drop the finding.
4. Is the severity defensible? If you cannot justify the severity in one sentence, downgrade.

Findings that survive the self-check go into the final array. Aim for fewer, sharper findings rather than a long list.

Phase 4: Persist + optional post (script)

Pipe the validated finding array (and a free-form summary string) into:

python3 scripts/run.py --pr <pr_number> --persist --summary-file <path>

scripts/run.py will:

1. Validate every finding against the strict schema (rejects on first violation, logs which finding).
2. Render {project-root}/_bmad-output/pr-workflow/prs/{pr_number}/review.md.
3. Transition the PR's state from ReviewPending to Reviewed.
4. If prj_post_review_comment = true, post a Comment-type review on GitHub via gh pr review --comment --body-file. Default is false at v1, so most invocations only write the cache.
5. Append a structured run-log entry.

scripts/run.py will NEVER pass --approve or --request-changes to gh pr review. The skill posts an advisory comment or it stays silent; the human owns the gate.

Architecture

Concern	Lives in
Orchestration (fetch / validate / persist / optional post)	scripts/run.py
gh pr view + gh pr diff fetching, AC extraction	scripts/github_fetch.py
Findings schema validation + review.md writer + state transition	scripts/review_io.py
Optional GitHub PR comment post (gated by prj_post_review_comment)	scripts/github_post.py
Hindsight bank prj best-effort lookup	scripts/hindsight_lookup.py

All state I/O routes through state_io (owned by prj-orchestrator). Sibling-imported via sys.path patch.

State Locations

• Per-PR review: {project-root}/_bmad-output/pr-workflow/prs/{pr_number}/review.md
• State queue (read/write): {project-root}/_bmad-output/pr-workflow/state.json
• Run-log (append-only): {project-root}/_bmad-output/pr-workflow/logs/{YYYY-MM-DD}.jsonl

Configuration

Variable	Default	Effect on this skill
prj_repo	(required)	Repo passed to every gh call
prj_post_review_comment	false	When true, post the review as a GitHub PR Comment-type review

Non-Negotiables

• Every finding cites file + line. No structural rants without anchors.
• Strict schema or reject. scripts/review_io.py will fail the run if a finding is malformed; this is the contract.
• Never approve or request-changes. The optional post is Comment-type only. Approval and change-requests are human decisions.
• Cache-first. Default behavior is cache-only. Flipping prj_post_review_comment to true is an explicit project choice.
• Hindsight best-effort. A Hindsight outage must not block a review. Log and continue.

Verification

Smoke test (no PR posting, no state writes):

python3 scripts/run.py --pr 1 --fetch-only --project-root <path-to-project>

Unit tests:

python3 -m unittest discover scripts/tests