Imported from bingcheng45/memory-chess (.claude/skills/verify-memory-chess/SKILL.md). Install upstream with npx skills add bingcheng45/memory-chess --skill verify-memory-chess. Copyright stays with the author.

Verify Memory Chess

Memory Chess is a Next.js 15 App Router web app. The user's surface is the browser. This skill launches a production build locally, drives it over raw Chrome DevTools Protocol, and captures evidence. There is no Playwright, Cypress, or Puppeteer in this repo and you must not add dependencies to package.json; the helpers here need only Node 22+ (built-in fetch and WebSocket), curl, and a local Google Chrome (default /Applications/Google Chrome.app/Contents/MacOS/Google Chrome, override with CHROME_BIN). On a clean machine that is the whole driver setup: nothing to install.

All commands below run from the repo root. PORT defaults to 4517 everywhere; never use 3000, which this project reserves for manual runs. The feature recipes live in features/README.md; read that index before driving anything.

Launch

npm run build
.claude/skills/verify-memory-chess/helpers/serve.sh start 4517

npm run build runs the message validator first and fails the build if it fails. serve.sh start refuses a port that is already in use, starts next start detached in the background, records the server's pid and start time in .verify/server-<port>.pid with its log in .verify/server-<port>.log, and returns once http://127.0.0.1:<port>/ answers. A start that never answers kills what it spawned and removes the pid file, so an existing pid file always names a server that answered on its port. Teardown is serve.sh stop 4517, which signals only the process group of the pid it recorded, and only after checking that pid is still the server it started.

Verification works without any env vars. .env.local is not committed; without it the Supabase-backed leaderboard and games-played counter degrade gracefully (see Evidence) and the contact form's Google Sheets write fails with a 500. Never copy secrets from a checkout's .env.local into any committed file.

Doctor

.claude/skills/verify-memory-chess/helpers/doctor.sh 4517

Read-only. Confirms something listens on the port, that the listener is the server this checkout's serve.sh recorded in .verify/server-<port>.pid (the recorded pid must be alive and still be the same process instance, checked by start time, so a reused pid never passes), and that / answers 200 with "Memory Chess" in the body. A server this checkout's serve.sh did not start fails the check even when it was launched from the same directory; another agent may own it, so refuse to drive it. Run doctor first whenever anything looks off, and before reusing a server from an earlier step.

Drive

Run the cheap layer first: npx jest covers the stores, utilities, and SEO structure in seconds (expect every suite green; from a worktree under .claude/, which jest.config.js ignores, run npx jest --testPathIgnorePatterns=/node_modules/). Drive the browser for what Jest cannot see, which is everything below.

node .claude/skills/verify-memory-chess/helpers/cdp.mjs <drive-script.mjs> \
  --evidence .verify-evidence/<run-name> [--base http://127.0.0.1:4517]

cdp.mjs launches its own headless, muted Chrome with a throwaway profile, connects over CDP, runs your drive script, prints PASS/FAIL plus the script's return value, and always kills the Chrome it launched. A drive script default-exports async (page, { baseUrl, evidenceDir }) => result with this page API: goto(url), eval(expr), waitFor(expr, timeoutMs), click(selector, text?) (with text, prefers an exact trimmed match over a substring match; clickText is the same call), screenshot(name), sleep(ms), send(method, params), on(listener).

send and on are the raw protocol. send issues any CDP command and resolves with its result; on(listener) registers (method, params) => void for every CDP event the page emits. Use them for facts the DOM cannot show, such as an outgoing request body: await page.send("Network.enable"), then page.on((method, params) => { if (method === "Network.requestWillBeSent") ... }) captures params.request.postData for a form the user submits. send also reaches domains the wrapped API does not cover, such as Emulation.setDeviceMetricsOverride for viewport emulation when checking a layout at phone widths. Prefer the DOM API above for everything the user can see.

A complete worked example, a full game round, ships as helpers/drive-game-round.mjs:

node .claude/skills/verify-memory-chess/helpers/cdp.mjs \
  .claude/skills/verify-memory-chess/helpers/drive-game-round.mjs \
  --evidence .verify-evidence/game-round --base http://127.0.0.1:4517

Stable handles in this app, in order of preference:

aria-label attributes: board squares ("e4", or "e4 with white king" when occupied), piece palette ("Select white pieces", "Select white king"), the language switcher.
data-coordinate="e4" on every board square; interactive squares also carry role="button".
Visible English button text ("Start Training", "Skip", "Submit", "Try Again"). English is the bare-URL locale, so drive English routes unless the feature under test is localization itself.
There are no data-testid hooks in the app; do not invent selectors from Tailwind classes, they churn.

Evidence

Evidence goes in .verify-evidence/<run-name>/ at the repo root. It is gitignored along with .verify/; never delete it during cleanup. A proof captures the action and the resulting state, not just a final screen: screenshot each phase you pass through, and pair what the screen shows with a second, independent read of the same fact. For a game round that second read is the persisted store in localStorage["memory-chess-storage"] (state.gameState), whose skill rating and configuration the submit updates. Exercise the real user path through clicks; never call store actions or internal setters from eval.

What a non-JS crawler sees

This app was rejected by Google AdSense because /game server-rendered 8 words and /leaderboard 17 while both looked fine in a browser. Any change touching pages, layouts, or client/server component boundaries must therefore also assert the server-rendered floor, not just the rendered browser state:

.claude/skills/verify-memory-chess/helpers/ssr-words.sh http://127.0.0.1:4517/game 150

ssr-words.sh curls the route exactly as a non-JS crawler would, strips <script>, <style>, and all tags, prints words=<count> plus the surviving text, and exits 1 if the count is under the floor. Save its output into the evidence directory (... | tee .verify-evidence/<run>/game.ssr.txt). Use it for a quick look at one route.

The AdSense gate

The site was rejected twice for "Low value content". Any change that adds, removes, or reshapes a page, a sitemap entry, a layout, or translated copy must pass the whole-site audit before it is done:

npm run audit:adsense -- --base http://127.0.0.1:4517 --out .verify-evidence/<run>/adsense

It reads /sitemap.xml, fetches every listed URL as a non-JS reviewer would, and applies one rule per Google policy item:

HTTP 200.
Listed pages are indexable and self-canonical.
At least 300 main-content words, with nav and footer excluded. WORD_FLOOR_EXCEPTIONS names each short page and why.
No hidden text at any viewport. Hidden means an inline opacity: 0, display: none or visibility: hidden, a hidden attribute, a bare hidden class with no breakpoint display class that shows it again (sm:block, md:flex, lg:inline-flex), a bare invisible class with no breakpoint visible class (md:visible), or a breakpoint hidden or invisible class such as md:hidden or sm:invisible. aria-hidden is not hidden, and an element with no words counts nothing.
No loading or placeholder text.
One h1, a title, and a description.
Links to privacy, about, terms, and contact.
At most one ad unit.
Titles and descriptions unique within a language.
No two pages of a language sharing more than half their 5-word shingles.
No sentence of 5 or more words on more than three pages of a language. Citations (cite), link text (a), and elements marked data-authorship-note, such as the guides' AI-assistance note, are excepted. The <address> byline is not excepted and counts as prose.
No section-heading template. A page with at least 4 h2 headings fails when half or more of them each head more than three pages of its language.
hreflang pointing only at listed URLs, from both the HTML <link rel="alternate"> tags and the Link response header. The two must name the same hreflang codes and the same URL for each; a side with no alternates, such as a missing Link header or one carrying only font preloads, counts as naming none, so a page with alternates on one side only fails and a page with neither passes. URLs compare by origin, path without a trailing slash, and query, with the production origin mapped to --base, so https://thememorychess.com and <base>/ are equal.
No broken internal links.
No unlisted indexable page. A page linked from a listed page that answers 200 without noindex must be in the sitemap.
ads.txt naming the publisher.
One 308 to a URL that answers 200. Each tested URL, requested without following redirects, must answer 308, its Location (production origin mapped to --base) must be the expected URL, and that URL must answer 200 with no further redirect. Two sets are tested. trailing-slash-redirect covers every listed URL other than / with a slash appended, expecting the listed URL. locale-prefix-redirect covers every English-only listed URL under each locale prefix, with and without a trailing slash, expecting the bare English URL, so /de/about and /de/about/ must each go straight to /about. English-only means the sitemap entry has no hreflang alternates, the served canonical is the URL itself, and the first locale's prefixed path is not served in translation. Served in translation means a 200 whose page is noindex or canonical to itself, as /de/leaderboard is, and skips the path; any other answer, such as a 200 canonical to the bare URL or a 404, keeps it so the redirect failure is reported. Locales come from the sitemap alternates, whatever order the <xhtml:link> attributes come in. The check also fails when the sitemap yields no locales, or when there are candidates but none is English-only, so it cannot pass having checked nothing. This goes through the real server, so next.config.ts redirects, rewrites and skipTrailingSlashRedirect are covered, which the middleware unit tests are not. A failure prints the redirect chain it saw, up to 5 hops.

It prints a table per rule and every failing page, writes audit.json under --out, and exits 1 on any failure. It exits 2 when /sitemap.xml does not answer 200 or lists no URLs, since there is nothing to audit.

When a rule fails, fix the page. Change a rule only when the rule is wrong about what Google asks for, in its own commit that says why. Editorial prose (Learn, the changelog, about, privacy, terms) is English-only with one URL each; the route list in src/lib/seo/englishOnly.ts drives the redirects, the sitemap, and the footer links, so a new editorial route goes there rather than into the message catalogues.

A local build proves the leaderboard only against fixture rows. After a deploy, confirm production serves real rankings to a non-JS reader:

curl -s https://thememorychess.com/leaderboard | grep -o '<tr' | wc -l

Expect well over 40 rows across the four boards. A count near zero means the page was built or revalidated while Supabase failed, and a crawler is reading the unavailable state.

Without Supabase credentials

/api/leaderboard returns { data: [], error } and /api/game-stats errors; the UI shows the "Leaderboard Temporarily Unavailable" state and hides the games-played counter. That is the expected passing state for an unconfigured run, and the graceful-degradation path is itself worth asserting. With credentials present in .env.local, expect real rows and assert content instead.

Cleanup

.claude/skills/verify-memory-chess/helpers/serve.sh stop 4517
rm -rf .verify

cdp.mjs already tears down its own Chrome and profile on both pass and fail. Kill only what you started: serve.sh stop signals only the recorded pid's process group, never by name, and when the recorded pid is dead or was reused by another process it reports the record as stale and clears it without signalling anything. .verify-evidence/ survives cleanup; after cleanup, confirm your evidence files still exist there. Run cleanup after failed attempts too, so broken runs do not strand a port.

Helpers

All in helpers/, invocations shown above. The four run directly; drive-game-round.mjs is a module cdp.mjs imports, so it carries no shebang and is not executable: serve.sh (launch and teardown), doctor.sh (health check), cdp.mjs (browser driver), drive-game-round.mjs (worked drive script), ssr-words.sh (non-JS crawler word floor).

Maintenance

Keep features/ honest as the app changes; /maintain-verification-skill is the loop for that.

verify-memory-chess

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