name	unop-review-pr
description	Adversarially review a PR's diff against main with inline comments and a verdict, appending to the shared file if one exists
argument-hint	<PR> [<anchor>]

Review Unop PR

Adversarially review the change in a PR. Read the shared file if present, review the approach and the diff against main, and rate each finding by severity. Append a ## Review N section to the shared file, post inline comments and a verdict review on the PR, and apply a verdict label to the anchor.

This skill runs autonomously, without asking for approval. Any human gates belong to the calling workflow, not here. It reports a summary at the end.

Concepts

GitHub repo: ProZeratul/CrusaderKings3UnofficialPatch. Use the gh CLI for all GitHub operations.
Anchor: the issue or PR number carrying the labels and shared file — the issue a PR closes, or the PR itself if it closes none.
Shared file: tmp/issue-<anchor>.md — the handover document. Other skills may create it with the ## Analysis section and append ## Fix N sections. This skill reads both and appends ## Review N. May be absent.

Context

Commands should be executed in the current working tree (the Unop repo root, or the worktree the session was launched in).

Arguments

PR number (position $0, required): the GitHub PR to review (e.g. 517).
Anchor number (position $1): the issue or PR carrying the shared file and labels; defaults to the PR.
Identity (position $2): the role this skill posts as, defaults to reviewer.

Guidelines

Read the project's CLAUDE.md first.
Identify yourself. Post as <identity>: begin each comment's first line with **<identity>:**. A comment containing @<identity> is addressed to you.
Read the shared file in full if present — the ## Analysis section and every prior ## Fix N and ## Review N.
- If there is none, derive the change's intent from the PR description, diff, and any linked issue.
Read the relevant parts of the Unop and vanilla files before reviewing — don't limit yourself to the diff.
Be adversarial. Your job is to find problems with the fix, not to validate it. Default to skepticism.
Don't invent problems. Only report findings grounded in the actual code and game mechanics.
Consult examples.md for relevant past investigations when a situation it covers comes up.

Workflow

1. Load Context

Read the shared file for the investigation, the fix approach, and prior fix/review cycles.

Count the existing ## Fix N sections — this review is ## Review N for the same N. Review only the latest fix; earlier ## Fix N / ## Review N sections are history for context. If the shared file is absent, this is ## Review 1: start it from the PR's intent in place of ## Analysis.

Re-review due to PR feedback. If the PR carries comments after your last **<identity>:** comment (especially any addressing @<identity>), read its conversation and review comments — gh pr view <PR> --comments, plus inline comments via gh api repos/ProZeratul/CrusaderKings3UnofficialPatch/pulls/<PR>/comments. Take any feedback from the maintainers into account but vet each against the code; fold valid points into your ## Review N findings, and note any you disagree with rather than silently deferring.

2. Check Out the PR and Get the Diff

Check out the PR branch so you can read PR-side files in full, then get its diff with gh pr diff. Read the relevant parts of the affected Unop and vanilla files for context beyond the diff:

gh pr checkout <PR>
gh pr diff <PR>

3. Review

A PR may bundle several distinct changes; apply the checks below to each on its own merits. The output stays a single findings list and one verdict — don't split it into per-change sections.

Review the Approach

Before the line-level review, judge the approach itself — as stated in the latest ## Fix N and as realized in the diff:

Root cause vs. symptom. Does the approach target the root cause identified in ## Analysis, or does it patch over a symptom while the underlying bug remains?
Simplicity. Is this the simplest viable fix? Flag new state, new files, or new triggers added where an existing trigger, variable, flag, or guard would have expressed the fix. See examples.md (#420).
Altitude. Could one higher-level change replace the N changes? If the fix patches each member of a group, is the group itself the right level? If an analogous system handles the same condition, does the fix mirror that verified mechanism or invent a parallel one? See examples.md (#498).
Pattern class / sibling systems. Did the fix enumerate the whole category? Check analogous systems — other files sharing the mechanic — for the same bug; a reproducing sibling left untouched is a finding. See examples.md (#498).
Load-bearing assumption. Is the single behavioral assumption the fix depends on corroborated (a precedent, a doc/log line) or merely asserted? An unverified core assumption is a finding even if prior cycles repeated it. See examples.md (#498).
Guard intent. If the approach loosens or adds a guard, is the stated intent sound and aligned with the design intent in the whole feature — comments, localization, and effects? Watch for a widened proxy that re-admits the cases it was guarding. See examples.md (#440, #501).
Reporter's fix. If the approach follows the reporter's suggestion, was that suggestion evaluated critically rather than taken as default? See examples.md (#213).
Re-fix. If a prior ## Review N exists, does this approach genuinely resolve its High/Medium findings, or merely work around them?

Review the Implementation

For each changed file, check:

Missed call sites. Grep the guarded symbol across the codebase. Vanilla often runs the same logic in 2-3 places; one missed duplicate means the bug survives. See examples.md (#213).
Guard interactions. Are there other guards in the same is_shown / is_valid / can_create block that would still block the reporter's case even after this fix? See examples.md (#440).
Side effects. Does the fix destroy state that other events, effects, or on_actions still depend on? See examples.md (#213).
#Unop comments. Are they present on the first changed line? Are they accurate and concise?
Tiger is clean. Re-run make tiger yourself — don't trust the fix's claim that it passes. Any error or warning the fix introduced or left unaddressed is a finding. Don't invoke the tiger skill or fix anything; that's for the next fix cycle.
Tiger suppressions. If the fix added entries to ck3-tiger.conf (# False positives / # Ignored), challenge each one: warnings should be fixed, not suppressed, unless tiger is proven wrong. A warning suppressed that should have been fixed is a finding.
Vanilla file commits. If a new vanilla file was added, was it added in a separate commit without modifications?

4. Rate Findings

Assign each finding a severity:

High — the fix is wrong or incomplete: the original bug survives, a regression is introduced, another system is broken, or the approach is fundamentally misdirected.
Medium — a significant concern with a plausible failure mode: likely-missed call site, suspicious guard interaction, untested edge case, or a needlessly complex approach.
Low — style, clarity, or minor correctness issue that doesn't affect whether the fix works.

Severity tracks the shipped fix (the diff and its in-game behavior), not the handover prose. A change you've judged correct and on-purpose is not a Medium because the ## Fix N narrative omitted it, understated its scope, or gave a wrong rationale. An under-described change is at most a Low finding pointing testers at it; it never drives the verdict.

The verdict is Needs work if there is any High or Medium finding, otherwise Looks good.

5. Append to the Shared File

Append a ## Review N section to the shared file:

## Review N

**Verdict:** Looks good | Needs work

**Findings:**

| Severity | Description |
|---|---|
| High | ... |
| Medium | ... |
| Low | ... |

Omit the findings table if there are no findings.

6. Post the Review and Apply the Verdict Label

Get the PR head commit:

SHA=$(gh pr view <PR> --json headRefOid -q .headRefOid)

Prefer inline comments. For each changed line that raises a concern, write a line-level comment — adding a ```suggestion block proposing the exact change where you can. Submit them together with the verdict as one review with event COMMENT, so you neither approve nor block. Build the payload as a JSON file, then post it:

# tmp/review.json:
# {
#   "commit_id": "<SHA>",
#   "event": "COMMENT",
#   "body": "**<identity>:** <Looks good | Needs work> — <gist>\n\n- <one line per High/Medium finding>",
#   "comments": [
#     { "path": "<file>", "line": <new-file line in the diff>, "side": "RIGHT", "body": "<note; optionally a ```suggestion block>" }
#   ]
# }
gh api -X POST repos/ProZeratul/CrusaderKings3UnofficialPatch/pulls/<PR>/reviews --input tmp/review.json

Comment only on lines present in the diff, using new-file numbers with side: RIGHT. Omit comments if you have no line-level notes.

Apply your verdict label to the anchor via the label API — set review:looks-good or review:needs-work, removing the other:

gh api --silent -X POST repos/ProZeratul/CrusaderKings3UnofficialPatch/issues/<anchor>/labels -f "labels[]=review:needs-work"
gh api --silent -X DELETE repos/ProZeratul/CrusaderKings3UnofficialPatch/issues/<anchor>/labels/review:looks-good

7. Report Summary

When done, report to the user:

Verdict (Looks good or Needs work).
Summary of High and Medium findings; Low findings briefly.
Recommended next step: if Needs work, the fix needs another pass; if Looks good, the PR is ready for human review.

Reference

Examples

examples.md contains past investigations, one section per issue. Read the relevant section when its situation comes up.

Usage Examples

/unop-review-pr 517