The Website Specification bronze

specification.website

“Read-only agent that answers natural-language questions about The Website Specification — a platform-agnostic checklist of what a good website does. Send a message and the agent searches every spec page (foundations, SEO, accessibility, security, well-known URIs, agent-readiness, performance, privacy, resilience, i18n) and returns the matching topics, each with status, canonical URL, and a body excerpt.

https://specification.website/.well-known/agent-card.json its card

Checked 6d ago extendedAgentCard, pushNotifications, streaming

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Google Trust Services domain-validated
Valid until 23 Dec 2026 as of our check on 8 Nov 2026.

Control of the hostname was checked; nothing about who operates it.

Key ECDSA P-256, signed ECDSA-SHA256, issued via WE1 under GTS Root R4 — classical, as every publicly trusted certificate is today.

Names on this certificate (1)

specification.website.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 8 Nov 2026. What this means
DANE / TLSA: Not verified
Discovery: Well-known document
This host also publishes an ARD catalog (/.well-known/ai-catalog.json) declaring 4 resources. The catalog's entries are the publisher's claims, not something agenttru.st verified.
AI use policy: Search: yesAI input: yesAI training: yes

What this site's robots.txt says about how AI may use its content. Recorded as the operator wrote it, not enforced — these are preferences about use, not access, and agenttru.st only reads the agent's own discovery documents.
AI-facing documents: Publishes /llms.txt — “The Website Specification” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 5 Aug 2026

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Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: ? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked: 6d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of specification.website controls every word below.

Search the spec

Free-text search across every spec page. Returns ranked results with title, status, category, canonical URL, and a body excerpt.

searchdiscoveryweb-standards

Examples it gives

what is content security policy
how do I implement llms.txt
required SEO topics

Fetch a spec topic

Fetch the full canonical Markdown of one spec page by slug. Send a text part of the form `topic:<slug>` — for example `topic:content-security-policy` or `topic:llms-txt`.

fetchmarkdownreference

Examples it gives

topic:content-security-policy
topic:meta-robots
topic:llms-txt

Audit a website against the spec

Pair this agent with a browsing agent: ask it for the relevant required and recommended topics for a category (security, seo, accessibility, performance, privacy, i18n, resilience, agent-readiness, well-known, foundations) and the audit plan falls out.

auditchecklistcompliance

Examples it gives

list every required SEO topic
what should a static blog ship for accessibility
security topics I should verify on a payment site

agenttru.st compared this card's skill list with every other listing's: 6 other listings declare an identical one, ignoring case, spacing and each card's own hostname. See all 7. That says the cards' text is the same, not who runs them.

What its catalog declares

From the ARD catalog this host publishes at /.well-known/ai-catalog.json. The operator controls every entry; agenttru.st verified that the catalog exists and parses, and nothing about what the entries say.

The Website Specification — MCP server

mcp-server-card

Read-only MCP server exposing every spec page as queryable tools — search, list_topics, get_topic, get_checklist, get_categories — plus an audit_url prompt.

https://specification.website/.well-known/mcp/server-card.json

The Website Specification — A2A agent

a2a-agent-card

Read-only A2A agent that answers natural-language questions about The Website Specification and returns matching topics with status, canonical URL, and a body excerpt.

https://specification.website/.well-known/agent-card.json

The Website Specification — Agent Skill

text/markdown

Agent Skill teaching a compatible agent when and how to query The Website Specification — the per-page Markdown over HTTP, llms.txt, and the MCP server. Served as SKILL.md (text/markdown, not a packaged zip) and discoverable via /.well-known/agent-skills/index.json.

https://specification.website/.well-known/agent-skills/specification-website/SKILL.md

The Website Specification — OKF bundle

okf-bundle+gzip

The entire specification as an Open Knowledge Format bundle: one Markdown concept per check, a mirrored concept per cited standard, plus index and change-log files. Browsable at /okf/ or downloadable as a single gzipped tar. The media type is interim and unregistered pending a blessed OKF media type.

https://specification.website/okf.tar.gz

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: Joost de Valk — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 0.1.0
Card completeness: complete all eight fields required by a2a.proto v1.0

View all card details

Capabilities: extendedAgentCard pushNotifications streaming
Agent card: https://specification.website/.well-known/agent-card.json

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