review-pr

name	review-pr
description	Review a PR for correctness, pattern compliance, testing, accessibility, and safety. Produces a confidence score for merge readiness.
argument-hint	<PR-number-or-branch>
allowed-tools	Bash Read Grep Glob

Review a Pull Request

Review PR $ARGUMENTS and produce a confidence score for merge readiness.

Phase 1: Gather PR Context

# PR metadata
gh pr view $ARGUMENTS --json title,body,author,labels,files,additions,deletions,baseRefName,headRefName,state,isDraft,number

# Changed files list
gh pr diff $ARGUMENTS --name-only

# Full diff
gh pr diff $ARGUMENTS

# CI status
gh pr checks $ARGUMENTS

Phase 2: Classify PR Type

Determine the PR type from changed files and metadata:

Type	Detection	Check scope
docs-only	All files are *.md, docs/**, **/stories/**, **/.storybook/**	Change file only
test-only	All files are *.test.*, *.spec.*, **/testing/**	Change file + test quality
bug-fix	Branch starts with fix/ or title contains "fix"	All checks, extra weight on tests
feature	Branch starts with feat/ or adds new exports	All checks, extra weight on API + patterns
refactor	No new exports, restructures existing code	All checks, extra weight on no behavior change
config/infra	Changes to CI, configs, scripts only	Change file + no regressions

For v8 packages (packages/react/): skip V9 pattern checks — those are maintenance-only with different patterns. For web-components (packages/web-components/): skip React-specific checks.

Phase 3: Run Checks

Run each check category. For each finding, assign a severity:

• BLOCKER — must fix before merge
• WARNING — should address
• INFO — consider

A. Beachball Change File

Required if any published package source code changed (not just tests/stories/docs).

• Check change/ directory in the diff for new .json files
• Verify change type: patch for fixes, minor for features, never major without explicit approval
• Not required for changes that only affect tests, stories, docs, or snapshots

BLOCKER if missing for published source changes.

B. V9 Component Pattern Compliance

Only for files in packages/react-components/react-*/library/src/:

Check	Look for	Severity
No React.FC	React.FC, : FC<, React.FunctionComponent in added lines	BLOCKER
No hardcoded styles	Hex colors #[0-9a-fA-F]{3,8}, hardcoded px values for spacing/radius/font in .styles.ts files	WARNING
Griffel usage	Style files must use makeStyles from @griffel/react, not inline styles	WARNING
mergeClasses order	User className must be the LAST argument in mergeClasses()	WARNING
Slot system	New components must use slot.always/slot.optional and assertSlots	WARNING

Reference: docs/architecture/component-patterns.md

C. Dependency Layer Violations

For changes to package.json files or new imports in Tier 3 component packages:

• BLOCKER if a Tier 3 package (react-button, react-menu, etc.) adds a dependency on another Tier 3 package
• Allowed Tier 2 deps: react-utilities, react-theme, react-shared-contexts, react-tabster, react-positioning, react-portal
• Allowed Tier 1 deps: @griffel/react, @fluentui/tokens, @fluentui/react-jsx-runtime

Reference: docs/architecture/layers.md

D. SSR Safety

Grep added lines for unguarded browser API access:

Pattern	Severity
window. without canUseDOM or typeof window guard nearby	BLOCKER
document. without guard	BLOCKER
navigator. without guard	BLOCKER
localStorage / sessionStorage without guard	BLOCKER
instanceof HTMLElement	WARNING

Check 3 lines above each match for a guard (canUseDOM, typeof window !== 'undefined').

E. Testing

Check	Severity
Source files changed but no corresponding .test.tsx changes	WARNING
New component missing testing/isConformant.ts	WARNING
Snapshot files need updating (render/style changes without .snap updates)	INFO

F. API Surface

Check	Severity
Public API changed but etc/*.api.md not updated	WARNING
Existing exports removed (breaking change)	BLOCKER
New exports added (flag for human review)	INFO

G. Accessibility

Check	Severity
Existing aria-* attributes removed	BLOCKER
onClick without onKeyDown/onKeyUp handler	WARNING
Interactive elements missing role or aria-*	WARNING
Images/icons without aria-label or aria-hidden	WARNING

H. Security and Quality

Check	Severity
eval() or new Function()	BLOCKER
dangerouslySetInnerHTML	WARNING
console.log / debugger in production code	WARNING
// @ts-ignore without explanation	WARNING
any type in new code	INFO

I. Documentation coverage

A code change frequently lands something that someone downstream needs to learn about. The "someone" splits into two audiences with very different reading habits, so this check actually walks two passes:

• Pass 1 — user-facing docs. Component consumers (storybook stories, migration guides, docsite, MDX, change-file comments).
• Pass 2 — harness / agent-facing docs. Future agent sessions reading the skills, AGENTS.md, docs/workflows/*, and docs/architecture/*. When a PR changes a build target, a script, a CI step, a label taxonomy, a project-board field, or an assumption that a skill makes, the skill or harness doc has to be updated in the same PR — otherwise every fresh /triage-issues, /visual-test, /review-pr, etc. invocation pays the discovery cost over again.

Both passes ask the same two questions: should this PR have updated docs, and if so, did it? Bug fixes that restore documented behavior, internal refactors, and test-only PRs default to PASS in both passes — the interesting cases are below.

Pass 1 — user-facing docs

Source change	Expected doc surface
New prop on a public component (added in *.types.ts)	A Storybook story or MDX entry under packages/react-components/react-<name>/stories/ that exercises the prop
New public export added to a library/src/index.ts barrel	A story or MDX entry covering it (or a justified note in the PR body)
New component package (new directory under packages/react-components/react-*)	Stories package, library/docs/Spec.md, and an entry on the docsite (apps/public-docsite-v9)
Behavior change to a public API's defaults (e.g. a new conditional in use*_unstable that changes observable output)	Mention in library/docs/MIGRATION.md or a "BREAKING CHANGE / behavior change" section in the PR body
Removal or deprecation of a public export	library/docs/MIGRATION.md entry and/or a @deprecated JSDoc on the symbol
New design token, classname constant, or CSS custom property	A line in the relevant docs (often the component's stories MDX) explaining how to use/override it

Pass 2 — harness engineering / agent-facing docs

This pass exists because skills are part of the contract, not just convenience. When the skills are stale, the agents are wrong — quietly. Symptoms: a /visual-test invocation that points at a nonexistent project name, a /triage-issues flow that recommends a label the repo no longer has, a /triage-board skill that misses a new view filter the maintainers added.

Walk the diff for any of these and check whether the matching agent-facing doc was updated:

Source change	Expected harness update
New / renamed nx target (project.json, nx.json, generators)	Any skill that invokes that target — visual-test, lint-check, package-info, v9-component. The skill literally types the target name; it's not auto-discovered.
New / renamed top-level package.json script	Same. Plus docs/workflows/contributing.md if it's contributor-facing.
New label, label rename, or label taxonomy change in the repo (gh api repos/.../labels)	triage-issues/references/triage-labels.md — the skill uses an allow-list and gh issue edit rejects unknown labels.
New / changed project-board field, view filter, or option ID	triage-board/references/team-mapping.md (option IDs) and the view-filter mirror in triage-board/SKILL.md.
New convention contributors are expected to follow (file layout, naming, "always do X")	AGENTS.md / CLAUDE.md (they're symlinked) — the rules section is the agent's first read.
New layered dependency rule, package-tier reshuffle, or CODEOWNERS rewrite	docs/architecture/layers.md, docs/team-routing.md, plus triage-board/references/team-mapping.md if a CODEOWNERS handle gained or lost a confident mapping.
New first-time-setup requirement (e.g. a workspace package whose lib-commonjs/ must be pre-built)	docs/workflows/contributing.md "First-time setup" section AND the troubleshooting block of any skill that hits the failure mode (visual-test already does this for the unstable-deps case).
New skill, agent hook, or .claude/-level configuration	AGENTS.md skills table + the .claude/skills/<name>/SKILL.md bridge file.
Removal or move of a path that any skill greps for or hard-codes	The skill that referenced it. Search the skills (grep -rn "<old-path>" .agents/skills/) before merging.
Authentication / token-scope / permission changes that affect gh calls	The skill's preflight section. Concrete past examples: the EMU vs non-EMU active-account gotcha and the read:project vs project scope distinction now baked into triage-board's preflight.
New external-tool name or behavior change (e.g. assignee identity for an automated agent)	The relevant skill. Concrete past example: assigning to Copilot literally fails with "Bot does not have access" — only copilot-swe-agent works. That belongs in any skill that assigns to Copilot.

When docs are NOT expected (default to PASS)

• Pure bug fix that restores documented behavior
• Internal refactor with no exported-symbol or behavior change
• Build / CI changes that have no contributor-facing or skill-facing impact
• Test-only PRs
• Style-only PRs (typo, formatting) on internal code

Severity

Situation	Severity
Public export removed or behavior-changed without MIGRATION.md entry	BLOCKER
Skill references a renamed or removed path / target / label that this PR changes (skill will literally fail next run)	BLOCKER
New public component / new public hook with no story or MDX	WARNING
New public prop with no story exercising it	WARNING
New design token / className constant with no usage example	WARNING
Behavior change to public defaults with no PR-body callout	WARNING
New label / project field / nx target / convention without the matching skill or AGENTS.md / docs/workflows/ update	WARNING
New first-time-setup requirement without contributing.md mention	WARNING
PR description explicitly defers docs to a follow-up (link cited)	INFO
Docs / harness change exists but feels minimal — could be more thorough	INFO

How to actually run this check

The model should walk the diff, not guess.

1. Group changed files into surfaces. Code surfaces (library/src/**, index.ts barrels, *.types.ts); user-doc surfaces (stories/**, library/docs/**, apps/public-docsite-v9/**); harness surfaces (.agents/skills/**, .claude/**, AGENTS.md, CLAUDE.md, docs/workflows/**, docs/architecture/**, docs/team-routing.md, project.json, nx.json, root package.json scripts, .github/CODEOWNERS, .github/labeler.yml).
2. If the PR is purely a doc/harness surface, the check is PASS — it's documentation already.
3. For each row in the user-facing table that matches a code change in the diff, verify the corresponding doc surface was also touched. If not, raise the matching severity.
4. For each row in the harness-engineering table that matches, verify the corresponding skill or harness doc was also touched. Be specific: name the skill that needs updating, not just "a skill."
5. Cross-search: when a PR renames a path, target, or label, run grep -rn "<old-name>" .agents/skills/ docs/ AGENTS.md to find references that will break. Anything that turns up is a BLOCKER unless this PR also updates it.
6. Read the PR body before reporting. Authors often pre-empt with "docs follow-up tracked in #NNNN" or "harness skills updated in commit X" — those move findings from WARNING to INFO when the deferral is explicit and reasonable.

Phase 4: Calculate Confidence Score

Start at 100

For each BLOCKER:  -25 points
For each WARNING:  -5 points
For each INFO:     -1 point

Bonuses:
  +5 if tests added/updated alongside source changes
  +3 if change file present and well-described
  +2 if PR description is thorough

Floor at 0, cap at 100.

Score interpretation:

• 90–100: High confidence — safe to merge
• 70–89: Moderate confidence — minor concerns
• 50–69: Low confidence — needs attention
• 0–49: Not safe to merge — blockers present

Phase 5: Produce Output

Use this exact format (also used verbatim as the PR-comment body in Phase 6 — don't duplicate work).

Start directly with the score. Skip a header title, author, type, packages-affected, and CI-status preamble — when this is posted as a PR comment, all of that is already visible in the GitHub UI immediately above the comment, so repeating it just pushes the actually-useful content (score + findings) below the fold. The classification work from Phase 2 still happens; it just isn't echoed back at the reader.

### Confidence Score: <score>/100

<one-sentence summary>

### Findings

#### Blockers (must fix before merge)
- [ ] <finding with file:line reference>

#### Warnings (should address)
- [ ] <finding with file:line reference>

#### Info (consider)
- <finding>

### Category Breakdown

| Category | Status | Notes |
|----------|--------|-------|
| Change file | PASS/FAIL | ... |
| V9 patterns | PASS/WARN | ... |
| Dep layers | PASS/FAIL | ... |
| SSR safety | PASS/WARN | ... |
| Testing | PASS/WARN | ... |
| API surface | PASS/WARN | ... |
| Accessibility | PASS/WARN | ... |
| Security/Quality | PASS/WARN | ... |
| Docs coverage | PASS/WARN/FAIL | ... |

### Recommendation

APPROVE / REQUEST_CHANGES / COMMENT

<brief rationale>

Phase 6: Post the review back to the PR

After presenting the output in the chat, post the same text as a comment on the PR so the review is visible to maintainers and to Copilot (when the PR author is copilot-swe-agent, the comment becomes actionable feedback).

Save the output from Phase 5 to a temp file so the markdown isn't mangled by shell quoting, then:

gh pr comment $ARGUMENTS --repo microsoft/fluentui --body-file /tmp/pr-review-$ARGUMENTS.md

Append a single trailer line to the body so the post is identifiable:

---
*Posted via the `/review-pr` skill.*

The posted comment should be identical to what you rendered in chat — don't paraphrase or summarize. The chat output and the PR comment must match so the user can trust that what they saw is what the maintainers see.

Pre-checks before posting:

1. Confirm the active gh account has write access to the PR's repo (EMU accounts read fine but silently fail on writes):

   gh api graphql -f query='{ viewer { login } repository(owner:"microsoft", name:"fluentui") { viewerPermission } }'
   

   If viewerPermission is NONE, stop and ask the user to gh auth switch --user <non-emu-account>.
2. Don't post on PRs from your own branches unless explicitly asked — self-review comments are noise.
3. If REQUEST_CHANGES is the recommendation, still post the comment but note to the user that only a formal review (gh pr review --request-changes) actually blocks merge; a comment is advisory.

When to skip posting:

• The user explicitly asks for a review without posting ("review but don't post").
• The PR has an existing comment from this skill within the last day on the same head SHA — avoid duplicate noise. Look for the *Posted via the \/review-pr` skill.*` trailer.
• Draft PRs where the user is clearly still iterating (state=OPEN, isDraft=true, recent force-push) — offer to post but don't do it by default.

Notes

• For large PRs (50+ files), prioritize: published source files > test files > config. Note reduced confidence due to review scope.
• Draft PRs: still review but note WIP status.
• Merge conflicts: flag as BLOCKER if detected.
• The ### Confidence Score: NN/100 line must always appear on its own line for machine parsing.