# Self Serve Code Review > How to judge the implementation of an lfx-self-serve (LFX One) pull request: the general quality dimensions (correctness, error handling, tests, performance, readability, code truthfulness) and how to hold the diff to the repo's documented standards for the Angular SSR app and the Express BFF. Use on every PR that changes code, however small; this is the reviewer's line-level lens. Security has its own skill (self-serve-security-review). - Skill: `linuxfoundation/self-serve-code-review` (Agent Skill) - Install (CLI): `npx skillmds@latest add linuxfoundation/self-serve-code-review` - Raw SKILL.md: https://api.skillmd.com/api/skills/linuxfoundation/self-serve-code-review/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Security - Author: linuxfoundation (https://skillmd.com/u/linuxfoundation) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/linuxfoundation/self-serve-code-review --- # Self Serve Code Review Reviewer scope and the signal bar are owned by the `copilot-code-reviewer` skill (`.github/skills/copilot-code-reviewer/SKILL.md`); this skill assumes those and covers only the line-level judgment. Read enough surrounding code to judge each hunk in its real context — for a server change, the middleware → controller → service path it sits on; for an Angular change, the component, its template, and the signals and services it consumes. A diff alone is not enough. For each non-trivial hunk, read the **whole changed function**, not just the diff lines, and `Grep` for **callers and sibling implementations** of the same pattern to confirm the change matches how the repo already does it — convention drift is a finding even when the code "works". For a proxy change, read one layer past the diff: the upstream contract the call must mirror, not just the local shape. ## The house standards The repo defines its own standards; hold the diff to them, and name the documented source in any standards finding. Read the parts relevant to the diff before judging, every run, because the standards belong to the repo and move with it. They live in: - **`CLAUDE.md`** — the source-of-truth order, the domain language (PCC, ED, Admin Mode, personas, L2), commit/PR conventions, and the global "what NOT to do" list. - **`.claude/rules/`** — `component-organization.md` (Angular signal structure, `model()` vs `WritableSignal`, the DELETE→CREATE rule for full component replacements), `logging-patterns.md` (the Pino `LoggerService`, operation lifecycle, controller-vs-service logging responsibility), `styling.md` (Tailwind, `lfxColors`, `flex + flex-col + gap-*` not `space-y-*`), `ssr-safety.md`, and `development-rules.md` (the shared package, M2M-vs-user tokens, upstream-contract verification, code-quality rules). - **The four `docs/reviews/` checklists** — `frontend-checklist.md` (PrimeNG wrapper strategy: prefer the LFX wrapper over a raw `` in feature templates unless a documented exception applies, no function calls in render-time expressions — interpolation and property bindings should read signals or pipes, not call methods that re-run every change detection; event bindings like `(click)="save()"` are the normal exception — component organization), `backend-checklist.md` (the three-file service/controller/route pattern, controller-vs-service separation, custom error classes, user bearer tokens vs M2M, upstream API validation, protected files), `shared-and-sql-checklist.md`, and `docs-checklist.md`. Enforcement runs in both directions: code that violates a documented standard is a finding, and a documented standard the code has visibly outgrown is a finding against the docs. If a documented convention is wrong for this specific change, say so explicitly and explain the trade, rather than silently waiving or silently enforcing it. ## Quality dimensions Run these on the changed code, scaled to the size of the change: - **Correctness**: does it do what it claims? Watch unhandled Observable errors and leaked subscriptions, signals read where a `computed` was meant, effects with hidden write loops, `async`/`await` that drops a rejected promise, boundary conditions, and proxy calls whose request/response shape does not match the upstream contract. - **Error handling**: server errors follow the repo's error model — controllers pass errors to the handler (`next(error)`), services throw the custom error classes (`BaseApiError` and friends), and nothing is silently swallowed or leaked to the client. On the client, HTTP failures surface through the established error path, not a swallowed `catchError(() => of(null))` that hides a real failure as empty state. - **Tests**: new or changed behavior has tests that assert real behavior, not that a mock was called; new components get `data-testid` hooks and the dual E2E coverage the repo expects where appropriate. Missing tests on contract-bearing or security-sensitive code is worth raising when you can name the untested behavior and what breaking it would cost — not as a standing request for coverage. - **Performance**: for a caller-facing list, page the cursor through to the caller rather than draining every upstream page into one response (`/query/resources` carries a cursor — use it); a deliberate all-pages fetch for a complete-set operation (via the established all-pages helper) is a supported pattern, not a defect. No work in a template expression (it re-runs every change detection), no waterfall of sequential awaits that should be concurrent, and no oversized or unread `TransferState` payload. Transferring server-rendered state is the established hydration path here (`AuthContext`, runtime config) and it saves a duplicate client fetch, so the finding is state the client never reads or a result set big enough to bloat every SSR document — not the transfer itself. A server-only secret crossing that boundary is a security finding, not a performance one. - **Readability and structure**: the change reads like the surrounding code; names say what a thing is or does; duplicated logic that wants a shared helper is a finding when it traps the next editor. - **Code truthfulness**: comments, docs, and the PR description match what the code actually does; a stale comment, a dead branch, a `data-testid` that lies about the element, or a TODO dressed as done is a finding. ## Self Serve specifics worth a second look - **Shared package boundary.** New interfaces, reusable constants, and enums belong in `@lfx-one/shared`, not as module-level consts or local `interface` declarations inside `apps/lfx-one/`. A type duplicated instead of imported is a finding. - **PrimeNG independence.** Components are consumed through the LFX wrapper components, and types reference the PrimeNG component interface. A raw `` where an LFX wrapper exists, or a hand-rolled type where the wrapped interface exists, breaks the UI-library-independence the repo deliberately keeps — PrimeNG controls with a sanctioned direct use (documented exceptions) are fine. - **SSR safety.** Browser-only APIs (`window`, `document`, `localStorage`, `navigator`, the observers) must sit behind a browser-only boundary — an `isPlatformBrowser` guard, or an Angular render callback that does not execute during SSR; either is acceptable. Browser-only libraries must be lazy-imported inside that boundary — a static top-level import crashes the SSR bundle even when the call site is guarded. The failure only shows under `yarn build`, not `yarn start`. (Security consequences of SSR — secret leakage into the client — are the security skill's job.) - **Critical constants.** A changed constant is a behavior change even when the code "works": timeouts, retry/backoff values, page-size caps, cache TTLs, rate-limit tiers, feature-flag defaults, env-var keys, and upstream URLs or subjects. When the diff moves one, ask whether the change is stated and intentional and what its blast radius is. The finding is a blast radius the change does not account for, not the absence of a sentence explaining it — a correct new value needs no rationale to be correct. - **Protected files.** Changes to `server.ts`, the singleton services, build/format config, or `CLAUDE.md` carry repo-owner weight and warrant closer scrutiny — raise one when its risk or intent is unclear, not merely because a sensitive file was touched (a clean, well-understood edit to one is not itself a finding). ## Judgment calls - **Point at the working pattern.** When the diff violates a pattern, cite the working example in the surrounding code rather than describing an abstract ideal. - **Do not propose rewrites of a sound approach**, and do not suggest change for its own sake; working, readable code needs no improvement. - **Know your limits.** Distinguish "this is wrong" from "this might be a problem depending on context", and say which one you mean. When a judgment depends on something you cannot see (an upstream microservice's contract, a deployment value, a runtime feature flag), note the dependency rather than asserting a defect you cannot confirm.