Owner tools

For the owner of Rectangle Shopping + Kits (www.rectangle.so).

Ownership

This launch is unclaimed.

Claim this launch to get an owner link, re-scan after fixes, track your score improvements, or remove your site from StackScope entirely.

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Fixes that improve your score

Security

HIGHAdd the missing security response headers
Missing: Permissions-Policy
WhyEach header limits a class of browser-side attack: clickjacking, XSS, MIME sniffing, plaintext fallback. Missing headers leave default-permissive behaviour in place.
WhereMost are one line each in your server config, reverse proxy, CDN, or framework headers.
Learn more
Why this matters & sources
Per-header consequence:
- Permissions-Policy: Turns off browser features your site doesn't use (camera, microphone, geolocation, payment) so an injected script can't trigger them.

Page basics & SEO

MEDIUMAdd a canonical link
No <link rel="canonical"> was detected on your page.
WhyTells search engines which URL is the canonical version when the same content is reachable via multiple paths (with/without trailing slash, query strings, www vs apex).
WhereAdd <link rel="canonical" href="https://your-domain.com/this-page"> to each page's <head>.
Learn more

Optional improvements

These don't change your StackScope score but cover SEO, agent-readiness, security-researcher discoverability, and compliance items worth addressing.

Security

LOWAdd /.well-known/security.txt
WhyLets security researchers report vulnerabilities responsibly through a published contact channel.
WhereCreate /.well-known/security.txt with a Contact: email and Expires: date.
Learn more

Legal & compliance

HIGHAdd a cookie-consent banner
Analytics detected on this site without a consent manager.
WhyUK/EU GDPR requires opt-in before analytics scripts fire; about half of US state privacy laws now require honouring the Global Privacy Control browser signal as a universal opt-out.
WhereDrop in Cookiebot, Usercentrics, Osano, or Iubenda Consent, or hand-roll a banner plus Google's Consent Mode v2.
Learn more
Why this matters & sources
The legal landscape: UK/EU GDPR treats analytics as personal-data processing that requires opt-in consent before scripts fire. About half the US state privacy laws now in force (California, Colorado, Texas, Connecticut, Oregon, Montana, Delaware, New Hampshire, New Jersey, Nebraska) require honouring the Global Privacy Control (GPC) browser signal as a universal opt-out, and California's January 2026 regulations require visibly indicating when a GPC signal has been honoured.
Sources: IAPP US state privacy tracker (iapp.org/resources/article/us-state-privacy-legislation-tracker), California AG on GPC (oag.ca.gov/privacy/ccpa/gpc), EDPB consent guidelines (edpb.europa.eu).

Email security

HIGHAdd an SPF record
No SPF TXT record found at the apex domain.
WhyWithout SPF and DMARC, receiving servers have fewer signals to reject spoofed mail using your domain.
WherePublish a TXT record at the apex like v=spf1 include:_spf.google.com ~all (replace the include: with your real sender, then end with ~all for soft-fail or -all for strict).
Learn more
MEDIUMMove DMARC from p=none to quarantine or reject
DMARC policy is p=none (monitoring only).
Whyp=none lets receivers log failures but still deliver spoofed mail. Real protection only kicks in at quarantine or reject.
WhereAfter reviewing a few weeks of rua= reports and confirming your real senders pass, change to p=quarantine (sends spoofs to spam) and then p=reject (blocks them outright).
Learn more
LOWAdd MTA-STS
No MTA-STS DNS record published.
WhyPrevents mail to your domain being downgraded to plaintext mid-flight by a network attacker. Most launches don't have this, so deploying it puts you a tier above generic email-security checks.
WherePublish a TXT record at _mta-sts.{your-domain} plus a policy file at https://mta-sts.{your-domain}/.well-known/mta-sts.txt.
Learn more
LOWAdd a TLS-RPT record
No TLS-RPT record at _smtp._tls.{domain}.
WhyReceivers can tell you when STARTTLS handshakes to your mail server fail. Without it, silent TLS failures are invisible.
WherePublish one TXT record at _smtp._tls.{your-domain} like v=TLSRPTv1; rua=mailto:[email protected].
Learn more

Page basics & SEO

LOWTrim your meta description to under 160 characters
Currently 207 characters: "Shop anything — electronics, apparel, home goods, appliances, and more — across Amazon, Best Buy, Newegg, Walmart, Target, and hundreds of other retailers. Compare prices, add to one cart, and checkout once."
WhyGoogle truncates around 155-160 characters on desktop SERPs (less on mobile), so anything past that won't appear in the snippet.
WhereEdit your <meta name="description"> tag. Put the most click-worthy phrase first.
Learn more

Agent / AI

LOWDeclare a Content-Signal in robots.txt
WhyStates how you'd like AI systems to use your content (training, search, agent input). Without it, AI crawlers fall back to whatever default policy each vendor applies.
WhereAdd a Content-Signal: line to your robots.txt.
Learn more
LOWAdd Link response headers
WhyLets agents discover your sitemap, privacy policy, and docs without parsing HTML, which most lightweight agents skip.
WhereSet Link: response headers in your server config or framework middleware.
Learn more

If a tip looks wrong (for example it says "add a consent banner" and you already have one) the detection's the bug, not you. StackScope sees what's public from the outside: HTTP response, rendered HTML, cookies, and DNS. We can miss vendors that load behind consent, are self-hosted, or use an install shape we haven't fingerprinted yet. Email [email protected] and we'll look into it.

Copy into Cursor, Claude, or ChatGPT

This prompt includes the detected stack and only the fixes StackScope found. It asks the AI to make concrete file-level changes, not a vague website review.

Score-affecting basics only. Ask your AI to handle these first; come back for the optional hardening once they're done.

Everything: score-affecting fixes plus optional email security, agent metadata, and best-practice items. Longer prompt, more for an "all in one" agent run.

I own https://www.rectangle.so. StackScope (https://stackscope.dev) analysed it on 20 April 2026 and scored it 9.2/10 against their production-readiness checklist. Please help me apply the fixes below. These are the score-affecting basics. We'll circle back to the optional hardening (email security, advanced agent metadata) later.

Tech stack StackScope detected on the site (use this when suggesting where each fix lives in the codebase):
browserbase, contentsquare, google-analytics, google-maps, google-search, google-site-verification, google-tag-manager, google-workspace, hsts, nextjs, react, resend, shadcn-ui, stripe, tailwindcss, twitter, vercel, vercel-dns, vercel-live

Score-affecting fixes (these improve the StackScope score; [HIGH] = most impact):
- [HIGH] Add the missing security response headers. Missing: Permissions-Policy Why: Each header limits a class of browser-side attack: clickjacking, XSS, MIME sniffing, plaintext fallback. Missing headers leave default-permissive behaviour in place. Where: Most are one line each in your server config, reverse proxy, CDN, or framework headers. (https://owasp.org/www-project-secure-headers/)
- [MEDIUM] Add a canonical link. No `<link rel="canonical">` was detected on your page. Why: Tells search engines which URL is the canonical version when the same content is reachable via multiple paths (with/without trailing slash, query strings, www vs apex). Where: Add `<link rel="canonical" href="https://your-domain.com/this-page">` to each page's `<head>`. (https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls)

For each item, tell me exactly which file to create or which code to change, and where it lives in a project using the stack above. If my framework has a native API for the task (e.g. Next.js metadata exports, `app/sitemap.ts`, Astro layouts, Nuxt `useHead`), prefer that over raw HTML or server config.

Full analysis: https://stackscope.dev/launch/jbzfreww/rectangle-shopping-kits

I own https://www.rectangle.so. StackScope (https://stackscope.dev) analysed it on 20 April 2026 and scored it 9.2/10 against their production-readiness checklist. Please help me apply the fixes below. This is a checklist, not a blocker list; Score-affecting fixes are the ones that move the number, Optional items are nice-to-haves with zero score impact that I can skip for an MVP.

Tech stack StackScope detected on the site (use this when suggesting where each fix lives in the codebase):
browserbase, contentsquare, google-analytics, google-maps, google-search, google-site-verification, google-tag-manager, google-workspace, hsts, nextjs, react, resend, shadcn-ui, stripe, tailwindcss, twitter, vercel, vercel-dns, vercel-live

Score-affecting fixes (these improve the StackScope score; [HIGH] = most impact):
- [HIGH] Add the missing security response headers. Missing: Permissions-Policy Why: Each header limits a class of browser-side attack: clickjacking, XSS, MIME sniffing, plaintext fallback. Missing headers leave default-permissive behaviour in place. Where: Most are one line each in your server config, reverse proxy, CDN, or framework headers. (https://owasp.org/www-project-secure-headers/)
- [MEDIUM] Add a canonical link. No `<link rel="canonical">` was detected on your page. Why: Tells search engines which URL is the canonical version when the same content is reachable via multiple paths (with/without trailing slash, query strings, www vs apex). Where: Add `<link rel="canonical" href="https://your-domain.com/this-page">` to each page's `<head>`. (https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls)

Optional best-practice improvements (no score impact):
- [HIGH] Add a cookie-consent banner. Analytics detected on this site without a consent manager. Why: UK/EU GDPR requires opt-in before analytics scripts fire; about half of US state privacy laws now require honouring the Global Privacy Control browser signal as a universal opt-out. Where: Drop in Cookiebot, Usercentrics, Osano, or Iubenda Consent, or hand-roll a banner plus Google's `Consent Mode v2`. (https://iapp.org/resources/article/us-state-privacy-legislation-tracker)
- [HIGH] Add an SPF record. No SPF TXT record found at the apex domain. Why: Without SPF and DMARC, receiving servers have fewer signals to reject spoofed mail using your domain. Where: Publish a TXT record at the apex like `v=spf1 include:_spf.google.com ~all` (replace the `include:` with your real sender, then end with `~all` for soft-fail or `-all` for strict). (https://www.cloudflare.com/learning/dns/dns-records/dns-spf-record/)
- [MEDIUM] Move DMARC from p=none to quarantine or reject. DMARC policy is `p=none` (monitoring only). Why: p=none lets receivers log failures but still deliver spoofed mail. Real protection only kicks in at quarantine or reject. Where: After reviewing a few weeks of `rua=` reports and confirming your real senders pass, change to `p=quarantine` (sends spoofs to spam) and then `p=reject` (blocks them outright). (https://dmarc.org/overview/)
- [LOW] Trim your meta description to under 160 characters. Currently 207 characters: "Shop anything — electronics, apparel, home goods, appliances, and more — across Amazon, Best Buy, Newegg, Walmart, Target, and hundreds of other retailers. Compare prices, add to one cart, and checkout once." Why: Google truncates around 155-160 characters on desktop SERPs (less on mobile), so anything past that won't appear in the snippet. Where: Edit your `<meta name="description">` tag. Put the most click-worthy phrase first. (https://developers.google.com/search/docs/appearance/snippet)
- [LOW] Add /.well-known/security.txt. Why: Lets security researchers report vulnerabilities responsibly through a published contact channel. Where: Create `/.well-known/security.txt` with a `Contact:` email and `Expires:` date. (https://securitytxt.org/)
- [LOW] Declare a Content-Signal in robots.txt. Why: States how you'd like AI systems to use your content (training, search, agent input). Without it, AI crawlers fall back to whatever default policy each vendor applies. Where: Add a `Content-Signal:` line to your `robots.txt`. (https://contentsignals.org/)
- [LOW] Add Link response headers. Why: Lets agents discover your sitemap, privacy policy, and docs without parsing HTML, which most lightweight agents skip. Where: Set `Link:` response headers in your server config or framework middleware. (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Link)
- [LOW] Add MTA-STS. No MTA-STS DNS record published. Why: Prevents mail to your domain being downgraded to plaintext mid-flight by a network attacker. Most launches don't have this, so deploying it puts you a tier above generic email-security checks. Where: Publish a TXT record at `_mta-sts.{your-domain}` plus a policy file at `https://mta-sts.{your-domain}/.well-known/mta-sts.txt`. (https://datatracker.ietf.org/doc/html/rfc8461)
- [LOW] Add a TLS-RPT record. No TLS-RPT record at `_smtp._tls.{domain}`. Why: Receivers can tell you when STARTTLS handshakes to your mail server fail. Without it, silent TLS failures are invisible. Where: Publish one TXT record at `_smtp._tls.{your-domain}` like `v=TLSRPTv1; rua=mailto:tls-reports@yourdomain.com`. (https://datatracker.ietf.org/doc/html/rfc8460)

For each item, tell me exactly which file to create or which code to change, and where it lives in a project using the stack above. If my framework has a native API for the task (e.g. Next.js metadata exports, `app/sitemap.ts`, Astro layouts, Nuxt `useHead`), prefer that over raw HTML or server config.

Full analysis: https://stackscope.dev/launch/jbzfreww/rectangle-shopping-kits

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https://stackscope.dev/launch/jbzfreww/skill.md

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