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📊 Intel view 📋 Audit JSON 🔄 Changelog
100
A2A live JSON-RPC A2A 1.0 v0.1.0

The Website Specification

mcp.specification.website · Joost de Valk

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.

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Verify the domain mcp.specification.website via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.
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🔔 Watch this agent for changes. Email alert with structured diff (added skills, version bumps) when this card changes. Enterprise feature. Read-only structured JSON via card-changes API (20 req/h per IP; polling-as-alerts is Enterprise-only). Sign in to subscribe
Trust score
64/100
grade C · 9 criteria
Uptime
accumulating
1/5 probes
Revenue · 30d
no payment wallet declared
Usage · 7d
0
no recent activity
Card drift · 7d
changed
1 snapshots tracked
Owner
unverified
claim this listing →
C
Conformance score: 64/100
C-grade: usable but has clear conformance issues, review the breakdown below.
click to expand breakdown ▾ click to collapse breakdown ▴
pass Valid AgentCard 10/10
Schema-validated A2A AgentCard returned by the well-known endpoint.
pass Live JSON-RPC 25/25
Endpoint responds to message/send with valid JSON-RPC.
pass Protocol version 10/10
Declares A2A 1.0 with supportedInterfaces[] (v1.0.0 fully compliant).
info JWS signature 0/10
Card is unsigned (most published agents are).
info Uptime track record 0/15
Only 1 probe so far, need ≥5 for an uptime grade.
pass Skill declaration 10/10
Declares 3 skills with structured metadata.
partial Verified Identity 5/10
Provider declared: Joost de Valk (https://joost.blog). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.
How to earn +5 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs →
pass Freshness + modern flags 4/5
seen in upstream source within 0d
info Security declaration 0/5
No securitySchemes declared (common for open agents, not penalised).
⚠ Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 calls Public aggregate · no PII recorded

No calls observed in the last 7 days. Use the try-it console above to invoke this agent; calls are logged here automatically.

Card history

1 snapshot Every change to agent-card.json
Captured Hash
2026-05-31 09:40:58 current 66021305aaf2… view →
Uptime
100.0%
1 probes
Response
67ms
last probe
Skills
3
declared
Streaming
SSE-capable

Try it

Send a message to this agent live. Your prompt is proxied through Agenstry.

calling agent…

Skills · 3 declared · mapped to canonical taxonomy

Search the spec

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

canonical General Web Search match 87%
searchdiscoveryweb-standards
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:…

canonical Get Article match 86%
fetchmarkdownreference
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, privac…

canonical SEO Analysis and Optimisation match 86%
auditchecklistcompliance

Health · last 1 probes

When HTTP Live JSON-RPC Latency
2026-05-31 09:40:58 200 67ms

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Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Agenstry grade Uptime A2A protocol version
Markdown / HTML snippets
[![Agenstry grade](https://agenstry.com/badge/mcp.specification.website.svg)](https://agenstry.com/agents/mcp.specification.website)
[![Verified Business](https://agenstry.com/badge/mcp.specification.website/identity.svg)](https://agenstry.com/agents/mcp.specification.website)
[![Uptime](https://agenstry.com/badge/mcp.specification.website/uptime.svg)](https://agenstry.com/agents/mcp.specification.website)
[![A2A version](https://agenstry.com/badge/mcp.specification.website/protocol.svg)](https://agenstry.com/agents/mcp.specification.website)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON
{
  "protocolVersion": "1.0",
  "name": "The Website Specification",
  "description": "Read-only agent that answers natural-language questions about The Website Specification \u2014 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.",
  "version": "0.1.0",
  "documentationUrl": "https://specification.website/spec/agent-readiness/a2a-agent-cards/",
  "iconUrl": "https://specification.website/icon-512.png",
  "provider": {
    "organization": "Joost de Valk",
    "url": "https://joost.blog"
  },
  "supportedInterfaces": [
    {
      "url": "https://mcp.specification.website/a2a/v1",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    }
  ],
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "extendedAgentCard": false
  },
  "defaultInputModes": [
    "text/plain"
  ],
  "defaultOutputModes": [
    "text/markdown",
    "text/plain"
  ],
  "skills": [
    {
      "id": "search-spec",
      "name": "Search the spec",
      "description": "Free-text search across every spec page. Returns ranked results with title, status, category, canonical URL, and a body excerpt.",
      "tags": [
        "search",
        "discovery",
        "web-standards"
      ],
      "examples": [
        "what is content security policy",
        "how do I implement llms.txt",
        "required SEO topics"
      ],
      "inputModes": [
        "text/plain"
      ],
      "outputModes": [
        "text/markdown"
      ]
    },
    {
      "id": "get-topic",
      "name": "Fetch a spec topic",
      "description": "Fetch the full canonical Markdown of one spec page by slug. Send a text part of the form `topic:<slug>` \u2014 for example `topic:content-security-policy` or `topic:llms-txt`.",
      "tags": [
        "fetch",
        "markdown",
        "reference"
      ],
      "examples": [
        "topic:content-security-policy",
        "topic:meta-robots",
        "topic:llms-txt"
      ],
      "inputModes": [
        "text/plain"
      ],
      "outputModes": [
        "text/markdown"
      ]
    },
    {
      "id": "audit-against-spec",
      "name": "Audit a website against the spec",
      "description": "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.",
      "tags": [
        "audit",
        "checklist",
        "compliance"
      ],
      "examples": [
        "list every required SEO topic",
        "what should a static blog ship for accessibility",
        "security topics I should verify on a payment site"
      ],
      "inputModes": [
        "text/plain"
      ],
      "outputModes": [
        "text/markdown"
      ]
    }
  ]
}