PenguinHarness

Efficient Self-Improving Harness for Everyone — open-source, local-first infrastructure that builds AI agents for you.

Estimated origin: China

Added July 23, 2026 · Last analysed July 23, 2026 · via · 67% unique tagline

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StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 23 July 2026; the live site may have changed since.

PenguinHarness is early-stage. Worth fixing first: missing several security headers, incomplete legal pages, and no robots.txt or sitemap.

Launched on Product Hunt on July 23, 2026. The site is hosted on GitHub Pages and served through Fastly, with a domain registered 5 days before launch. We've detected 6 technologies on this site, covering CDN, CSS frameworks, developer tools, and DNS providers. The stack includes Tailwind CSS, Alibaba Cloud, and Fastly.

It's running the same core stack as 232 other launches.

If you own this site, refresh the snapshot and see the full fix list any time →

2.2

StackScope Score

Poor

78/100 Launch Readiness

Well prepared

0/6 Security Headers

Poor

0/3 Legal

Missing

0/2 Crawl files

Missing

86/100 Performance

Fast

Vibe Score 15 · Few AI signals

How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (6)

Infrastructure

CDN	Fastly
DNS	Alibaba Cloud
Hosting	GitHub Pages

Build & Framework

CSS framework	Tailwind CSS
Developer tools	Vite
JavaScript library	React Router

Infrastructure

Network

FASTLY - Fastly, Inc., US

AS54113 · US

DNS

Alibaba Cloud

Authoritative nameserver

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

Green hosting

Not green hosted

No green-energy record. Data from The Green Web Foundation.

SSL Certificate

Let's Encrypt

Valid 19 Jul 2026 to 17 Oct 2026

Certificate as captured in this snapshot, not a live check.

Domain Age

7 days

Registered Jul 2026 · Dominet (HK) Limited

Email Security

✗

SPF Not published. Your domain can be spoofed in phishing emails.

DKIM Not detected at common selectors. Your provider may use a custom one.

✗

DMARC Not published. Receivers fall back to permissive defaults.

MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.

TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Storage (0)

This site uses no client-side storage we could detect on page load.

Readiness Breakdown How?

✓ Custom title and meta description

⚠

Open Graph tags (title, image, description) (partial) missing og:image

✓ Twitter card meta tags

✓ Responsive viewport meta tag

✓ Favicon present

✓ Semantic HTML (nav, main, article)

⚠

Page title is 62 characters (advisory) Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible.

⚠

Meta description is 186 characters (advisory) Google only shows about 155–160 characters of the description in desktop search results (less on mobile); anything past that won't appear.

- Canonical URL declared

Performance How?

162 ms Server response

79% Faster than peers

3864 ms Largest contentful paint

0.00 Cumulative layout shift

589 KB Page weight

282 KB Image weight

0 Console errors

0 Failed requests

⚠ 13 images: 11 oversized, 11 without width/height, 11 missing alt text

Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.

Vibe Score Breakdown How?

Signal	Points
AI copy signals	+5
AI palette signals	+5
AI writing signals	+5

This score is based on structural patterns and is not definitive. Many legitimate sites may trigger signals, and AI-built sites may go undetected. It should be treated as an indicator, not a verdict.

AI Stance

No AI stance declared

✗ llms.txt published

✓ No AI bots blocked in robots.txt

Content-Signal

? No directive declared

Link headers

? None advertised

Well-Known Files

✗ robots.txt

✗ sitemap.xml

✗ security.txt

✗ llms.txt

✗ ads.txt

✗ humans.txt

Legal

? Privacy Policy not detected

? Terms of Service not detected

Detection works best on English language sites.

Security Headers (0/6)

✗

Referrer-Policy

✗

X-Frame-Options

✗

Permissions-Policy experimental (check browser support)

✗

X-Content-Type-Options

✗

Content-Security-Policy

✗

Strict-Transport-Security

–

X-XSS-Protection deprecated (use Content-Security-Policy)

Build

1 JS files

1 CSS files

0 Third-party domains

Brand Colours

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