Conduct goal-aligned code reviews of individual pull requests, analyzing correctness, solution fit, performance, code alignment, testing coverage, and code quality while helping authors converge quickly on a mergeable change. Provides prioritized, actionable feedback with stable closure criteria. Use when asked to "review PR #[number]", "code review pull request", "check PR for issues", or "analyze PR changes". Works on GitHub or Azure DevOps, with PR numbers, branch names, or GitHub/Azure DevOps PR URLs. NOT for developer performance reviews over time.
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name
pr-review
description
Conduct goal-aligned code reviews of individual pull requests, analyzing correctness, solution fit, performance, code alignment, testing coverage, and code quality while helping authors converge quickly on a mergeable change. Provides prioritized, actionable feedback with stable closure criteria. Use when asked to "review PR #[number]", "code review pull request", "check PR for issues", or "analyze PR changes". Works on GitHub or Azure DevOps, with PR numbers, branch names, or GitHub/Azure DevOps PR URLs. NOT for developer performance reviews over time.
Review individual PRs for code quality, security (OWASP Top 10), performance, and testing adequacy.
Progressive loading: this file is the workflow spine. Each step names the
reference file to load WHEN you reach it. Load references at their step, not
up front — the load instructions are mandatory, not optional.
<reviewer_philosophy>
Rigorous Reviews That Converge
The reviewer protects the codebase and helps the developer land the right
change without avoidable review rounds. Rigor and flow are not competing goals:
the review succeeds when material risk is exposed early, the author knows the
shortest path to resolve it, and the acceptance bar remains stable.
Apply this decision order throughout the review:
Does the code solve the stated problem? Check the linked work item, PR
description, acceptance criteria, and explicit non-goals.
Is the solution substantially in the right ballpark? The implementation
may not be the reviewer's preferred design, but it must be sound, fit the
codebase, and avoid a fundamental architectural dead end.
What must change before merge? Be ruthless about demonstrated correctness,
security, data-loss, compatibility, and material operability risks. Do not
block on perfection, personal preference, or unrelated cleanup.
How can the author close each blocker efficiently? State the required
outcome, offer a minimal viable path when useful, and define objective
evidence that will close the thread.
Core beliefs:
The PR goal is the invariant anchor. Never let accumulated review comments
replace the original problem as the purpose of the PR.
Improve, do not perfect. Favor approval once a PR solves its stated problem,
uses a substantially sound approach, and improves or preserves overall code
health, even when optional improvements remain.
Severity and blocking are separate decisions. Severity describes impact;
[BLOCKER] means the issue must be resolved in this PR. A Medium observation
is not automatically a reason for another iteration.
Evidence outranks reviewer taste. Accept any implementation that satisfies
the required outcome safely; do not require the author to use the reviewer's
exact suggestion.
Do not move the goalposts. Re-reviews verify the original closure criteria
against the delta. New blocking findings require new evidence or new code, not
a fresh preference about unchanged code.
What this means in practice:
Do NOT soften findings to be "nice" — be direct, specific, and honest. A
clear [BLOCKER] tag is kinder than a production outage.
Do NOT approve with known merge risks just because the PR has been open too
long — time pressure is not a reason to lower the bar. Equally, do not hold
a goal-complete PR for polish.
DO acknowledge genuinely good work — but only when it's genuinely good, not
as a social lubricant before delivering criticism.
DO state the defect precisely. When suggesting a remedy, propose the
smallest correction that fixes it and label it as a floor, not a spec.
A suggestion that adds API surface (new types, actions, endpoints, tables)
must first state why no smaller correction exists — oversized suggestions
get adopted verbatim, the artifact grows, and the next review round finds
contradictions inside the growth.
DO assign every finding a lane — merge-blocking or follow-up (see
Severity Model below). A reviewer that cannot separate "ships broken" from
"should be fixed eventually" forces every observation into a blocker and
generates micro-work instead of quality.
DO give every Critical, High, or blocking Medium finding a closure contract:
why it matters, an implementation-neutral required outcome, a minimal
suggested path, and objective done-when evidence the next round can
verify without reinterpretation.
</reviewer_philosophy>
<severity_model>
Severity Model — Two Axes, Two Lanes
Every finding is graded on two independent axes:
Axis
Values
Question
Impact
CRITICAL / HIGH / MEDIUM / LOW
How bad is it if this ships?
Remediation
TRIVIAL / SMALL / SUBSTANTIAL / REDESIGN
How big is the smallest real fix?
A one-cell HIGH and a redesign HIGH need completely different author
responses. Fifteen findings all marked HIGH with no remediation axis is zero
signal.
The two axes assign each finding to one of two lanes. The lane IS the
blocker flag: merge-blocking = blocker: true, follow-up = blocker: false.
Merge-blocking lane (gates the verdict):
CRITICAL or HIGH impact — any remediation size (verify, don't infer: the
blocker must answer why this cannot safely merge now)
Violations of documented or enforced convention contracts — semver, release
metadata, repository policy, wire formats, public API shape. The fix is
trivial, but approving one tells the team the contract is optional.
Schema / migration / wire-compatibility issues — near-irreversible once
shipped; undefined behavior for existing state is a future minefield
MEDIUM-impact defects with TRIVIAL or SMALL remediation — real defect, cheap
to fix now
Follow-up lane (never gates the verdict — becomes issues/work items):
MEDIUM impact requiring SUBSTANTIAL or REDESIGN remediation — file an issue
against the implementation; do not hold the PR hostage to a redesign
Informal-preference deviations without a demonstrated merge risk (a valid
alternative design is not a finding)
Pre-existing problems the PR touches but did not make worse
LOW-impact findings
Every review MUST end with two lists: "These block merge" (the shortest
path to approval, with each blocker's required outcome and done-when) and
"These become follow-up issues". A finding not explicitly placed in the
blocking lane is follow-up by default.
</severity_model>
Skill Scope
Reviews individual pull requests (GitHub or Azure DevOps) or the current local
branch, including re-reviews after updates. NOT for developer performance
reviews over time.
Step 0a: Resolve the Provider & Repo
This skill reviews PRs on GitHub or Azure DevOps. Resolve the provider once
from the git remote, then use the matching tools throughout — full mapping in
Provider Resolution & Tool Mapping.
State the detected provider in one line and proceed. If no usable remote
exists, ask the user for the coordinates — do NOT guess from prior reviews
or hardcoded defaults.
GitHub uses GitHub MCP tools when connected, else the gh CLI (via Bash).
Azure DevOps uses mcp__azure-devops__*. On a tooling failure, use
gh:setup-gh-mcp or ado:setup-ado-mcp and retry. When only one provider's
tool is named below, use the mapped counterpart for the other.
Step 0: Determine Review Mode
Load reference/review-modes.md now. It covers
repo-convention loading, the three modes, and their setup:
Mode
When
Setup
Lightweight (default)
Low-complexity, self-contained changes — diffs tell the full story
Review directly from diffs, no worktree
Deep
Cross-cutting changes, new abstractions, high fan-out, unclear context
Worktree checkout via Start-PRReview.ps1
Local Branch
No PR yet — review current branch against a base
Merge-base scoped diffs
State the chosen mode and why; switch if the user disagrees.
Triage scope (files added/modified/deleted) to gauge how many parallel
agents to dispatch.
Deep mode: run the worktree setup from reference/review-modes.md.
Check previous comments — GitHub gh pr view <n> --json comments,reviews,
ADO getPullRequestComments. If previous review comments exist from this
reviewer (or Claude), load
reference/re-review-workflow.md and
switch to the re-review workflow instead of continuing.
Check linked work items (ADO getWorkItemById) or issues (GitHub
closingIssuesReferences).
Classify changed files: categorize each changed file by domain — use the
classification table in
reference/agent-dispatch.md.
Understand the changes: <Launch agent>
Analyze what was modified, the intent, and how it fits the project.
Cross-check the linked work item, if any.
Verify branch/target conventions from the repo's actual policy (repo
conventions) — never from a skill-level default. Emit a [QUESTION] only
if the branch name looks generated but the policy is unclear.
If PR title/description scope does not match the diff, emit a [QUESTION]
on the first pass only.
<review_intent_gate>
Create the Review Intent before judging individual findings. This record
is the stable anchor for domain agents, grading, verdict selection, and every
re-review:
PR fetch fails → verify PR number, check provider connectivity (GitHub gh auth status / ADO MCP), inform user
Worktree script fails → fall back to lightweight review mode
Agent dispatch fails → skip that agent, note in findings, continue with others
Comment posting fails → retry once, then present findings to user in conversation
</error_handling>
Critical Principles
1. Be Specific and Actionable
❌ "This code has issues"
✅ "Line 45: Missing null check for user parameter can cause NullReferenceException when called from endpoint X"
2. Include Code Examples — show the problematic code, why it's a problem,
and the recommended (minimal) fix.
3. Reference Exact Locations — path/to/file.cs:123 or UserService.cs:45-67.
4. Lead with Substance
Acknowledge genuinely good patterns when they exist — but never manufacture
praise to soften criticism. Empty compliments dilute the signal.
Lead with the most important findings. End with clear action items
prioritized by severity.
5. Hold a Stable, Evidence-Based Bar
Do not lower the bar because a PR is small, the author is senior, or the
deadline is tight.
Do not raise or reinterpret the bar after the author addresses the stated
required outcome. Accept equivalent safe fixes.
Flag patterns that would be copied by future developers — a bad pattern in
the codebase is an implicit recommendation to repeat it — but verify the
code is genuinely a template before treating precedent as impact.
When the same issue appears in multiple files, capture every instance — but
as ONE clustered finding (the mechanism) with the instances listed as
evidence beneath it, one closure condition covering all of them, not as N
separate findings. Partial fixes create inconsistency; N copies of the same
finding create micro-work and bury the actual pattern.
6. Verify Before Claiming — Avoid False Positives
Do NOT claim something "doesn't exist", "won't compile", "has no callers", "is
unused", or that code "only/all/always/never" behaves a certain way unless you
have high-confidence evidence. A false positive damages reviewer credibility
more than a missed finding. Quote your search in the finding: an absence
claim ("X is undefined") must show the search performed and the nearest section
that would define X, demonstrating it doesn't. Qualify scope-limited evidence
in the wording. Full rules:
Codebase Search Discipline.
Quick Reference Checklist
Code Alignment (do first): Follows project patterns, no duplication, framework best practices
Goal Alignment: Solves the stated problem and satisfies acceptance criteria
Solution Direction: Substantially sound and in the right ballpark
Use empty arrays when acceptance criteria, non-goals, or evidence are not
supplied. Keep these exact lower-camel field names at every handoff and
persist the complete object in the review summary for future re-reviews.
Use sources in this order: explicit acceptance criteria and non-goals, linked
work item, PR description, implementation plan, then commit/user context. Do
not silently substitute a reviewer's preferred scope for the stated scope.
NOT_SOLVED or PARTIALLY_SOLVED: identify the smallest concrete gaps
between delivered behavior and the stated outcome. These gaps can block.
FUNDAMENTALLY_MISALIGNED: explain the unsafe or unsustainable direction
and guide the author toward the nearest sound correction, not a wholesale
redesign unless one is genuinely required.
SOLVED + RIGHT_BALLPARK: enter convergence mode. Continue reviewing
rigorously, but create blockers only for evidence-backed merge risks. Keep
preferences, polish, and unrelated cleanup non-blocking.
UNCLEAR: ask one consolidated, high-value context question. Uncertainty
alone is not a blocker; inability to verify a core acceptance condition can
become a blocker only when the missing evidence itself creates merge risk.
Pass this exact Review Intent unchanged to every dispatched reviewer and to
review-grader. Revisions require newly discovered authoritative context and
must be called out explicitly; review comments themselves never redefine it.
</review_intent_gate>
Before dispatching ANY agent in steps 4-8, load
reference/agent-guidance.md and include its
four discipline blocks in every agent prompt: Context Question Emission,
Claim-Strength Discipline, Defect-Statement Discipline (smallest-fix
floors, quoted searches for absence claims, mandatory Underlying problem:
line), and Convergence Guidance (include the Review Intent; findings must
tie to the stated goal or a concrete merge risk).
Design principles: <parallel agent> — duplication analysis, modularity
/ SRP, simplification opportunities, consistency with the codebase's design
patterns.
Domain-specific review: <parallel agents> — Load
reference/agent-dispatch.md now. Dispatch
the domain agents whose triggers match the file classification from step 2,
plus the server-side checks it lists. temp-code-review is mandatory for
every PR. Run all applicable agents in parallel; collect findings before
step 8.
External agents: <parallel agents> — from the same
reference/agent-dispatch.md: dispatch
matching external agents per its matrix and size heuristics, concurrently
with step 7 where possible.
Cross-reference test coverage: use test_project_map from repo
conventions when defined; otherwise infer <Project>.Tests-style mappings
and note uncertainty. Flag new public methods without tests, and modified
tests that don't cover the new behavior. Only enforce repo-specific CI test
markers when conventions define them.
Consolidate context questions: collect [QUESTION] items from all
agent outputs; de-duplicate, filter ones already answered by PR/work-item
context, rank by review impact, cap at 10. Full workflow and philosophy in
reference/agent-guidance.md. Questions are
always non-blocking and never affect the verdict.
Severity grading — quality gate: <Dispatch review-grader agent> —
mandatory for every review. The grader protects both code quality and
convergence: it corrects over- and under-weighted findings, separates
severity from blocking status, and makes substantive feedback ready to
resolve in one focused pass.
Start the grader input with the unchanged Review Intent from Step 3.
Consolidate all findings from steps 4-9 into a structured list
De-duplicate: when multiple agents flag the same issue, keep the more
detailed version
Cluster by mechanism: if 3+ findings share the same underlying
mechanism (same root cause, same mistaken pattern), merge them into ONE
finding with the instances listed as evidence beneath it. A repeated
mechanism is the primary finding — never file it as N separate findings
and never demote it to a "secondary theme" paragraph.
Assign each finding a stable ID (F-001, F-002, ...). Reuse the same
ID on re-review; IDs never change when severity or wording changes.
Format each finding as:
## Finding [N]
- Id: [F-NNN]
- Original Severity: [CRITICAL/HIGH/MEDIUM/LOW]
- Remediation: [TRIVIAL/SMALL/SUBSTANTIAL/REDESIGN — size of the smallest real fix]
- Blocker: [Yes/No — the lane, per the Severity Model]
- Category: [e.g., Conventions, Architecture, Security, etc.]
- File: [path]
- Line: [1-based line or null]
- Instances: [file:line list — only for clustered findings]
- Issue: [description]
- Underlying Problem: [the mechanism behind the symptom, one sentence]
- Why It Matters: [concrete consequence for this PR, or "not supplied"]
- Required Outcome: [condition that must be true, or "not supplied"]
- Suggested Path: [smallest fix, labeled as a floor, or "not supplied"]
- Done When: [objective closure evidence, or "not supplied"]
- Evidence: [for absence claims — the search run and the nearest place that would define the thing]
Dispatch review-grader with the Review Intent and formatted list.
Require the grader to return each surviving finding using the exact
posting schema from post-pr-review: id, severity, remediation,
blocker, category, file, line, instances, issue,
underlyingProblem, whyItMatters, requiredOutcome, suggestedPath,
and doneWhen. Merge by stable id; never reconstruct location or
issue text from grader prose.
Use both the graded severity and graded blocker status (not the
originals) for verdict determination in Step 12. Do not infer blocking
from severity alone.
Assemble durable thread state before Step 12 — build reviewThreads[]
from existing bot-owned finding threads plus new final findings, per the
thread-state contract in
reference/publish-and-track.md.
Provide feedback: Load
reference/publish-and-track.md now for
the post-pr-review input contract, then delegate all posting to
skill: "code-reviewer:post-pr-review".
Determine verdict first — use the Review Intent and graded blocker
status. The verdict is driven by the merge-blocking lane only (see
Severity Model). Follow-up-lane findings never gate the verdict:
APPROVE — The stated problem is solved, the solution is in the
right ballpark, the merge-blocking lane is empty, and no substantive
follow-up remains. Reserve for clean PRs.
APPROVE_WITH_COMMENTS — The stated problem is solved, the solution
is in the right ballpark, the merge-blocking lane is empty, but useful
follow-up findings exist. They are posted as comments and offered as
work items — they must not create another required review cycle.
REQUEST_CHANGES — The stated problem is not solved, the solution is
fundamentally misaligned, or any merge-blocking finding remains. Multiple
Medium findings justify this only when their combined, concrete impact
makes the PR unsafe or incomplete to merge — a clustered mechanism whose
instances are individually Medium can qualify; an abstract pattern of
polish concerns cannot.
If Review Intent is UNCLEAR and no merge risk is demonstrated, use
APPROVE_WITH_COMMENTS and ask one non-blocking question. If the missing
evidence prevents verification of a core outcome or safety property, create
one evidence blocker with objective Done When and use REQUEST_CHANGES.
Do not invent a fourth COMMENT verdict.
Never request changes solely for personal style, a valid alternative
design, unrelated cleanup, speculative precedent, or perfection beyond the
PR goal.
After the verdict, ALWAYS close with the two lists:
Blocks merge / shortest path to approval — each merge-blocking
finding in priority order, one line each, using its stable
Required Outcome and Done When
Follow-up issues — each follow-up finding, one line each. Offer to
file these as work items (ADO convertFindingsToWorkItems /
createWorkItem; GitHub gh issue create) so they leave the merge
gate but stay tracked.
Use the summary template from
reference/output-format.md. Posting is
automatic — but approving or merging the PR always requires user
confirmation first.
Update review tracking: use skill: "code-reviewer:update-pr-tracking"
with the field mapping in
reference/publish-and-track.md. Skip for
Local Branch Reviews. Tracking is best-effort — a tracking failure never
fails the review.
