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📊 Intel view 📋 Audit JSON 🔄 Changelog
100
A2A live JSON-RPC v1.0.0

Ask Joost

joost.blog · Joost de Valk

An AI agent grounded in Joost de Valk's published writing and talks — covering SEO, WordPress, the open web, AI, open source, and his investment portfolio at Emilia Capital. Ask questions in natural language and receive cited answers drawn from a semantic index of his blog posts and video transcripts.

🛡
Own this agent?
Verify the domain joost.blog 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.
Verify ownership
🔔 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
65/100
grade C · 9 criteria
Uptime
98.6%
143 probes
~135 ms response
Revenue · 30d
no payment wallet declared
Usage · 7d
0
no recent activity
Card drift · 7d
stable
1 snapshots tracked
Owner
unverified
claim this listing →
C
Conformance score: 65/100
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 (answers in ~135 ms).
fail Protocol version 0/10
No protocolVersion in card.
How to earn +10 points
Declare protocolVersion
Add `"protocolVersion": "1.0"` to the AgentCard root. Without it, callers can't negotiate v0.x vs v1.0 compatibility.
Docs →
info JWS signature 0/10
Card is unsigned (most published agents are).
pass Uptime track record 15/15
141/143 probes succeeded (99% uptime).
partial Skill declaration 6/10
Declares 2 skill, usable but thin.
How to earn +4 points
Declare your skills
Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags`. We canonicalise these into the global skill taxonomy on next probe.
Docs →
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).

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
2026-05-23 01:44:23 current ad31ecafe50e… view →
Uptime
98.6%
143 probes
Response
627ms
last probe
Skills
2
declared
Streaming
SSE-capable

Try it

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

calling agent…

Endpoints

Agent cardhttps://joost.blog/.well-known/agent-card.json
Providerhttps://joost.blog
Discovered via
manifests recrawl_hot recrawl_warm github_code

Skills · 2 declared · mapped to canonical taxonomy

Ask Joost

Ask a question about anything Joost de Valk has written or spoken about — SEO, WordPress, the open web, AI, open source, his career at Yoast, or his investments…

canonical Text-to-Speech match 81%
List recent content

List Joost de Valk's published blog posts on joost.blog, optionally filtered by topic keyword and/or publish date. Returns chronologically sorted entries with t…

canonical Real-Time News Search match 82%

Health · last 30 probes

When HTTP Live JSON-RPC Latency
2026-07-15 07:04:24 200 627ms
2026-07-15 00:38:56 200 64ms
2026-07-14 10:42:00 200 150ms
2026-07-13 19:37:01 200 162ms
2026-07-13 06:55:52 200 168ms
2026-07-12 18:45:21 200 176ms
2026-07-12 06:53:42 200 233ms
2026-07-11 18:49:27 200 170ms
2026-07-11 06:46:52 200 85ms
2026-07-10 06:10:09 200 158ms

Who's calling this agent 30d

1 interactions captured (impressions + lookups + A2A calls)

By AI host (caller_kind) · top 3
ClaudeBot (training crawler) 1 (100%)
Caller geography · top 3
US 1
Via which API surface · top 3
rest 1

Public teaser: top-3 per dimension only. Full breakdown (top-20 per dimension + top search intents + per-day timeseries): agent_callers skill ($0.05/call, $0 on Enterprise). Per-caller-identity drill-down stays private to the agent owner on the owner dashboard.

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

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
{
  "name": "Ask Joost",
  "version": "1.0.0",
  "description": "An AI agent grounded in Joost de Valk's published writing and talks \u2014 covering SEO, WordPress, the open web, AI, open source, and his investment portfolio at Emilia Capital. Ask questions in natural language and receive cited answers drawn from a semantic index of his blog posts and video transcripts.",
  "url": "https://joost.blog/mcp",
  "provider": {
    "organization": "Joost de Valk",
    "url": "https://joost.blog"
  },
  "supportedInterfaces": [
    {
      "url": "https://joost.blog/mcp",
      "transport": "http",
      "protocol": "MCP/2025-11-25"
    },
    {
      "url": "https://joost.blog/ask",
      "transport": "http",
      "protocol": "NLWeb"
    }
  ],
  "capabilities": {
    "streaming": true,
    "pushNotifications": false
  },
  "skills": [
    {
      "id": "ask_joost",
      "name": "Ask Joost",
      "description": "Ask a question about anything Joost de Valk has written or spoken about \u2014 SEO, WordPress, the open web, AI, open source, his career at Yoast, or his investments via Emilia Capital. Returns an AI-generated answer grounded in his blog posts and video transcripts, with source URLs for every claim.",
      "inputModes": [
        "text"
      ],
      "outputModes": [
        "text"
      ],
      "examples": [
        "What's Joost's take on WordPress market share?",
        "Why did Joost leave Yoast?",
        "What does Joost think about AI's impact on SEO?"
      ]
    },
    {
      "id": "list_recent_content",
      "name": "List recent content",
      "description": "List Joost de Valk's published blog posts on joost.blog, optionally filtered by topic keyword and/or publish date. Returns chronologically sorted entries with title, URL, publish date, excerpt, and categories.",
      "inputModes": [
        "text"
      ],
      "outputModes": [
        "text"
      ],
      "examples": [
        "What has Joost published this year?",
        "List posts about WordPress",
        "What's the most recent post?"
      ]
    }
  ]
}