Imported from henry-md/codex-skills (check/SKILL.md). Install upstream with npx skills add henry-md/codex-skills --skill check. Copyright stays with the author.

Check

Use this skill to see a page from a signed-in perspective instead of from an anonymous browser session. Default to an anonymous per-thread local account. Only connect to Henry's real account when the user explicitly asks for Henry-specific verification. Here, "anonymous" means a signed-in local /check user that is isolated from Henry's real account and from other Codex threads.

Self-Healing Bias

This skill is intentionally more self-improving than the average skill. Creating and maintaining a visual/auth harness is complicated, so when a /check run has to figure out a reusable detail, missing setup step, auth workaround, browser harness quirk, repo pattern, or faster route to deterministic state, it is encouraged to update this skill or its repo-local helpers after the run. Prefer leaving the next /check run faster, clearer, and more seamless than the current one, while keeping product-code changes gated by the explicit sign-off rules below.

Workflow

1. Read repo-local check docs first when they exist. Prefer repo docs such as agent-docs/coding-conventions.md and any architecture notes that describe how the product should support visual verification. Keep runtime config, notes, screenshots, and saved auth state under this skill's per-repo folder at repos/<repo-key>/. If the repo is not configured yet, run the global setup script first so the per-repo folder is created automatically before continuing. Treat repo-local data-safety instructions as hard guardrails. Do not delete existing user data, saved tailoring jobs, or other persisted records just to reset a test environment unless the repo docs explicitly allow it for the exact artifacts you created during the current verification run.

2. Choose the account mode before opening the browser. Default to the repo's anonymous local /check account when the user asks for ordinary verification, CRUD-heavy repros, or anything that does not specifically require Henry's real data. Only target Henry's real account when the user explicitly asks for Henry's account, Henry-specific data, or the signed-in state for henrymdeutsch@gmail.com. When a repo supports anonymous per-thread accounts, prefer that mode so separate Codex tabs do not share cookies or app data.

3. Prefer an existing auth state for the chosen account before asking for a fresh login. The default state file should live in this skill's per-repo folder. For anonymous accounts, prefer a thread- or session-specific state file over one shared auth file. Verify the saved session before trusting it.

4. Refresh the chosen account's auth state without using Google login automation when possible. Prefer the global scripts/ensure-auth-state.sh flow plus repo config. When the app uses database-backed NextAuth with Prisma, prefer the global scripts/seed-nextauth-prisma-state.mjs helper. When the repo supports anonymous local users, prefer auto-creating or reseeding that local user over driving a third-party Google sign-in flow. Only fall back to interactive sign-in if the app truly requires it, such as when the real Henry account must be used and no local session-seeding path can produce it.

5. Resolve the target page from the user's request. If the user invokes /check /some-path, treat that path as the page route or URL to open, not as a filesystem path. If the user invokes /check without a path, infer the route and any in-app navigation from the current task context, prioritizing the feature or surface you were just changing. If several views are plausible, choose the one that best matches the current work and say which one you checked.

6. Prefer the existing headless harness when the repo already has one. Headless browser automation is the default, not the fallback. For extension repos or other browser-heavy products that already have a persistent Playwright or Chromium harness, use that headless path first instead of reaching for a headed browser by habit. For unpacked Chrome extension verification, prefer bundled Chromium over Google Chrome because Chromium reliably honors extension-loading flags while Google Chrome may ignore them. If a high-level Playwright flow cannot reach MV3 service workers, chrome-extension:// pages, or other extension internals cleanly, drop to Chromium plus the Chrome DevTools Protocol while staying headless. Treat a headed browser as an escalation path only for real browser-chrome issues such as docked side-panel shell behavior, focus quirks, or window integration that headless Chromium plus Playwright/CDP cannot faithfully inspect. If you choose headed instead of an available headless path, say what specifically blocked headless verification.

7. Capture the target page with the saved auth state. Reuse the global scripts/check-page.sh helper to take a screenshot of the requested route or URL. If you started a local dev server for the /check run, stop it before finishing unless the user explicitly asked to keep it running. Before doing slow browser-only setup such as repeated uploads, form typing, or modal-clicking, look for repo-local /check helpers that can safely pre-create deterministic test state for the anonymous account. Prefer doing reversible setup through repo-local helpers, direct storage writes, or first-party app APIs when that lets the browser focus on the actual proof points the user asked for. If the page requires extra navigation after load, extend the skill or add the smallest repo-side product change needed so the skill can perform that flow autonomously next time. Save screenshots under the per-repo folder inside this skill so the workflow stays centralized. When responding to the user, prefer rendering the screenshot inline with Markdown image syntax using the absolute file path so the Codex desktop app shows a preview instead of just a file card. For extension verification, prefer the extension's own page target such as chrome-extension://<extension-id>/index.html or options.html when the real browser shell is not directly targetable, and treat that surrogate as the default UI surface unless the bug is specifically about the shell itself. When extension pages are hard to reach through a high-level library, use CDP target discovery/attachment rather than abandoning headless verification too early. For extension conflict, duplicate, preflight, or confirmation UI, verify the persisted extension state and the mounted UI separately; a storage flag or background response is not enough if the final surrogate-page screenshot no longer shows the prompt. When the user asks for an "in-flight" screenshot, capture the first clearly visible running-state artifact that appears reliably, such as a toast, spinner, status pill, or progress step, instead of waiting for a richer client-only surface that may render later or inconsistently in headless mode.

8. Call out when the product surface is not directly addressable. If a feature lives behind client-only tabs, modal state, or other non-addressable UI state, say that a small refactor such as a deep-linkable query param or route would make /check much more useful. Ask the user explicitly whether you should make that refactor before touching the product code.

9. Open the saved screenshot in Codex and inspect it directly. Do not treat command success or HTML output as visual verification. Call out whether the requested data or UI is actually visible from the chosen account's perspective. For PDF, resume, document-preview, canvas, or embedded-viewer surfaces, treat a blank or mostly blank viewer screenshot as failed verification, even when DOM assertions pass. If headless Chromium cannot paint the embedded viewer, verify the artifact with native parsing such as page count and extracted text, then escalate to a real/headed browser or a page-render screenshot before claiming the visual result. Do not add product-code debug fixtures, mock records, routes, or buttons solely to satisfy this visual check; keep temporary fixtures and screenshots under this skill's repos/<repo-key>/ runtime area. DOM assertions, locator checks, and other direct page inspection can support the diagnosis, but a screenshot is still the completion artifact for /check.

10. Patch the skill and repo-local helpers when the workflow breaks or teaches you something reusable. Treat /check as a self-healing skill: if a missing step, flaky command, auth edge case, browser harness issue, or hard-won repo-specific discovery shows up during real use, update this skill first and keep repo-local additions minimal before trying again. If a /check run spends most of its time manually reaching the state to verify instead of proving the state itself, add or improve a repo-local prep helper so the next run can jump straight to the visual assertion. After each run, do a quick self-improvement pass and decide whether the global skill or repo-local support files should be updated so future runs are faster and more seamless.

Repo Pattern

When the current repo needs persistent support files for this skill:

• Create or reuse repos/<repo-key>/ inside this skill.
• Keep new runtime artifacts under repos/<repo-key>/ so the root ~/.codex/skills/.gitignore continues to exclude them from git by default.
• Keep repo-specific runtime config in repos/<repo-key>/config.env.
• Keep per-repo notes in repos/<repo-key>/workflow.md when needed.
• Keep generated screenshots and saved auth state there too.
• If this skill ever needs a new persistent runtime path outside repos/<repo-key>/, update the root ~/.codex/skills/.gitignore before writing those files.
• Do not create agent-docs/check or any other repo-local /check runtime folder unless the user explicitly asks for a repo-local exception.

Constraints

• Henry's canonical signed-in email is henrymdeutsch@gmail.com.
• Default to an anonymous local /check account when the user does not explicitly ask for Henry's account.
• Do not connect to Henry's real account unless the user explicitly asks for Henry-specific data, Henry's account, or the signed-in state for henrymdeutsch@gmail.com.
• When a repo supports thread-local anonymous accounts, treat that as the normal /check mode.
• Prefer http://127.0.0.1:3000 for local auth capture unless repo-local docs say otherwise.
• Treat saved storage state as a secret.
• Only delete artifacts that the current /check run created itself. If a clean-slate repro appears to require deleting older user-visible data, pause and ask the user what to do instead of wiping that data automatically.
• When using Henry's real account, never delete, clear, archive, overwrite, or otherwise mutate Henry-owned user-visible data unless Henry explicitly gives permission for that exact destructive action.
• When using Henry's real account, be conservative even with "cleanup" operations. Prefer preserving stale objects over deleting the wrong thing.
• When using an anonymous /check account, it is acceptable to create, update, and delete artifacts freely as needed for the repro unless repo-local docs say otherwise.
• Do not claim Henry-authenticated verification unless Henry's session verification passed and you visually inspected the screenshot.
• When /check is invoked without a path, do not stop just because the user omitted it; infer the most relevant page from context and proceed.
• Prefer local session seeding over third-party auth automation when the app uses database-backed sessions.
• When a repo already has a working headless browser harness, use it first and only escalate to headed with an explicit reason.
• Prefer bundled Chromium over Google Chrome for unpacked extension automation.
• Prefer staying headless even when you need to drop below Playwright and use CDP directly.
• Prefer moving reusable shell, Python, and Node automation into this global skill instead of duplicating it inside individual repos.
• Never refactor the product code to make tabs or views deep-linkable without the user's explicit sign-off.
• If the user needs a logged-in screenshot and the session is stale, keep iterating until the login capture flow works or you hit a real blocker that requires Henry to act.

Final Response

Report:

• which account mode you used: anonymous /check account or Henry's real account
• whether that session was reused or refreshed
• which route or URL you checked, and whether it was inferred from context
• the screenshot path
• an inline screenshot preview using Markdown image syntax with the absolute file path, unless the user asks for text-only output
• whether the requested account-specific data was visible
• any remaining auth or page-load uncertainty

Then output a line containing exactly:

After that delimiter, state whether you changed anything about this skill or its repo-local helpers so future /check runs are faster and more seamless. If nothing changed, say that no self-healing update was needed.