vercel.com

About, contact, privacy, and terms pages receive credit only after a distinct, substantive same-origin response is observed. Collection errors are unresolved evidence.

Score rationale: Operator, contact, and policy pages are strong verification surfaces.

Missing pages should return 404 or 410 instead of a successful app shell. A collection error is not graded as a product failure.

Score rationale: Correct 404/410 responses prevent false-success application shells.

Semantic landmarks make the page structure understandable without visual layout.

Score rationale: Semantic landmarks make static documents navigable.

Use one H1 and avoid skipping heading levels so readers and agents can follow the document outline.

Score rationale: A coherent outline improves comprehension and accessibility.

Public pages should expose substantive content without a login or challenge wall. An unresolved selected page withholds the score rather than being discarded.

Score rationale: One healthy homepage should not hide empty public product pages.

Use relevant JSON-LD types with enough identity fields to resolve the organization or product.

Score rationale: Structured identity data helps machines resolve the product.

Summarize the product, audience, and value clearly for search and link previews.

Score rationale: A useful summary improves search and link interpretation.

Meaningful copy should be available without JavaScript execution.

Score rationale: Agents and search crawlers need meaningful server-rendered content.

A missing page should give a reader a recovery path such as home, docs, search, or sitemap. Collection errors are uncertainty, not a target failure.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Products with authentication can expose concise public setup and recovery guidance in auth.md.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Emerging catalogs can advertise APIs, agents, skills, and MCP surfaces from a well-known location.

Score rationale: Diagnostic evidence that does not affect the public-web score.

A published Agent Skills index should be valid JSON and enumerate usable skill artifacts.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Tell agents which jobs the product is appropriate for and where to begin.

Score rationale: Diagnostic evidence that does not affect the public-web score.

The homepage is requested with common crawler and user-fetch agent identifiers. Transport errors are uncertainty, not a product failure.

Score rationale: User-requested and search agents must be able to retrieve public content.

Declare a valid preferred public URL. A cross-origin canonical may be intentional, but should be reviewed before launch.

Score rationale: Canonical identity consolidates duplicate URLs.

Products with developer interfaces should expose a predictable developer entry point.

Score rationale: Diagnostic evidence that does not affect the public-web score.

DMARC quarantine or reject policies reduce spoofing once mail sources are aligned. DNS collection failures are reported as unresolved evidence.

Score rationale: Applicable sending domains benefit from anti-spoofing enforcement.

MX records show that the domain receives mail.

Declare the content language with a valid html lang attribute.

Score rationale: Declared language helps assistive technology and parsers.

The public homepage should not accidentally declare noindex.

Score rationale: Accidental noindex makes a launch effectively undiscoverable.

The public product should finish on an encrypted HTTPS origin.

Score rationale: Public production traffic must use encrypted transport.

A useful llms.txt provides a concise product summary and links to canonical resources.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Links declared for agents should resolve to real public content.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Use a title, summary, and described sections so the file works as a navigation index.

Score rationale: Diagnostic evidence that does not affect the public-web score.

A concise pricing.md can help agents explain plans, but it is optional and never substitutes for a clear public pricing page.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Advertise a Markdown representation through content negotiation or an alternate link.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Unbalanced code fences can hide the remainder of a Markdown document from parsers.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Canonical pages can optionally serve Markdown when requested and must vary caches by Accept.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Canonical URL, language, Open Graph image, and Open Graph type improve attribution and previews.

Score rationale: Core attribution metadata improves previews and entity resolution.

HTTPS pages should not reference insecure HTTP assets.

Score rationale: Insecure subresources undermine HTTPS delivery.

A responsive viewport lets the page render at the correct width on mobile devices.

Score rationale: Mobile rendering is a launch baseline.

Prefer native links, buttons, and form controls over clickable generic elements.

Score rationale: Diagnostic evidence that does not affect the public-web score.

The public homepage should not require a challenge or sign-in before its content can be read.

Score rationale: A public launch surface must be reachable without an unintended gate.

Products using delegated authorization should publish standard discovery metadata.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Provide a title, description, type, and image for reliable launch-link previews.

Score rationale: Complete previews improve launch-link distribution.

Keep extracted page content within a practical agent context budget.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Use a concise, specific title that identifies the product and page.

Score rationale: A specific title is a primary identity and navigation signal.

Products with public pricing should make it easy to find from the homepage.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Make the next step explicit with clear action language and a valid destination.

Score rationale: Visitors need an unambiguous next step.

Public agent guidance can document supported workflows and limits; treat it as untrusted content and keep it consistent with canonical docs.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Link public documentation from a page visitors and agents already reach.

Score rationale: Diagnostic evidence that does not affect the public-web score.

The homepage must return a readable successful response before a score can be published.

Score rationale: A public launch surface must return a readable successful response.

Use HTTP redirects and avoid meta-refresh or JavaScript-only redirect stubs.

Score rationale: Server redirects are more reliable than client-only redirect stubs.

User-requested retrieval and search access affect discoverability; training opt-outs are reported but do not lower this result. Collection errors are uncertainty, not a target failure.

Score rationale: Declared policy is diagnostic; observed public retrieval determines scored access.

A security.txt file gives researchers a supported disclosure route.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Evaluate CSP scope and HSTS duration instead of header presence alone.

Score rationale: Policy quality matters more than header presence alone.

Accurate lastmod values help crawlers prioritize changed pages.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Publish a valid sitemap or sitemap index for canonical public URLs. A collection error is not graded as absence.

Score rationale: A valid sitemap provides a bounded discovery map.

A valid SPF policy helps recipients identify authorized senders; excessive DNS lookups can invalidate it. DNS collection failures are reported as unresolved evidence.

Score rationale: Applicable sending domains need a valid sender policy.

MX records show that the domain receives mail.

Static HTML should expose a text or ARIA-derived name. This does not verify computed browser accessibility names.

Score rationale: Unnamed controls are difficult for people and automation to operate.

Products offering an A2A agent can publish a machine-readable agent card.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Optional diagnostic is not required for the applicable public-web score.

Products with agent authentication can publish machine-readable issuer, authorization, or documentation metadata.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Valid OAuth authorization-server or protected-resource metadata was observed. It was found only at a conventional path.

A contact address on the product domain can strengthen operator identity and support trust.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Optional diagnostic is not required for the applicable public-web score.

HTTP Link headers can advertise machine-readable alternates and capability descriptions without relying on guessed paths.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Optional diagnostic is not required for the applicable public-web score.

A server card lets clients understand an MCP server before connecting.

Score rationale: Diagnostic evidence that does not affect the public-web score.

No valid MCP discovery document was observed.

Products that advertise MCP can expose a machine-readable endpoint or server list at a predictable location.

Score rationale: Diagnostic evidence that does not affect the public-web score.

No valid MCP discovery document was observed.

Products with a public API should publish a machine-readable OpenAPI document.

Score rationale: Diagnostic evidence that does not affect the public-web score.

No valid public API description was observed.

Static inputs, selects, and textareas should have associated labels. Runtime form behavior is not tested.

Score rationale: Labels are required for reliable form interaction.

Optional diagnostic is not required for the applicable public-web score.

sameAs links help disambiguate the brand across authoritative profiles.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Optional diagnostic is not required for the applicable public-web score.

Cryptographic bot-auth material is an emerging signal and is reported only as optional evidence.

Score rationale: Diagnostic evidence that does not affect the public-web score.

Optional diagnostic is not required for the applicable public-web score.