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📊 Intel view 📋 Audit JSON 🔄 Changelog
65
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.

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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.
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Compare public evidence

🔔 Watch this agent. Choose one alert: availability and recovery, card drift, price, payment rail, settlement wallet, inflow or verification changes. Add more alert types from your account. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch
Trust score
65/100
grade C · 9 criteria
Uptime
100.0%
45 direct probes · 30d
~159 ms response
Observed inflow · 30d
—
no payment wallet declared
Invocations · 7d
0
1 listing impression — no calls
Card drift · 7d
stable
1 snapshot tracked
Owner
unverified
claim this listing →

Dispute or improve this rating

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
Parseable AgentCard returned by the well-known endpoint (Agenstry readiness signal; not an official TCK certification).
pass Live JSON-RPC 25/25
Endpoint responds to a negotiated A2A SendMessage probe (answers in ~159 ms).
fail Protocol version 0/10
No protocolVersion in card.
How to earn +10 points
Declare protocolVersion
Add `"protocolVersion": "1.0"` (Major.Minor, no patch number — §3.6) to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.
Docs →
info JWS signature 0/10
Card is unsigned (most published agents are).
pass Uptime track record 15/15
45/45 probes succeeded (100% uptime).
partial Skill declaration 6/10
Declares 2 skill, usable but thin. 2 skills without tags — optional in 0.x, REQUIRED once you move the card to v1.0.
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` — `description` and `tags` are REQUIRED on AgentSkill since A2A v1.0, and tags are what discovery filters match on. 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
Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.

Activity (audit trail)

last 24h · 0 invocations 100.0% success Public aggregate · no PII recorded
0
invocations 7d
reached the endpoint through us
0
lookups 7d
our API answered about it
1
impressions 7d
appeared in a result list
Per event type (7d)
2
search_click
1
search_impression
Recent events (last 20)
When Event Method Status Latency
2026-10-18T17:24:28 search_click /agents — ok 2ms
2026-10-18T06:48:42 search_click /agents — ok 3ms
2026-10-13T13:33:12 search_impression — 200 ok —
2026-10-04T02:57:44 search_impression — 200 ok —
2026-10-04T02:53:37 search_impression — 200 ok —
2026-09-25T12:56:02 search_impression — 200 ok —

Card history

1 snapshot Every change to agent-card.json
Agent card snapshots
Captured Hash Snapshot
2026-05-23 01:44:23 current ad31ecafe50e… view →
Uptime
100.0%
45 direct probes · 30d
Response
176ms
last direct probe
Skills
2
declared
Streaming
✓
SSE-capable

Try it

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

calling agent… ⌘/Ctrl + Enter

Endpoints

Agent cardhttps://joost.blog/.well-known/agent-card.json
Providerhttps://joost.blog
About this provider off-card enrichment
SSL certificate
Google Trust Services
expires 2026-10-15
Discovered via
manifests recrawl_hot recrawl_warm github_code

Skills · 2 declared by this agent

These skills are declared by the agent. A taxonomy link appears only when we can classify a skill confidently.

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…

No taxonomy category yet
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…

No taxonomy category yet

Health · last 30 probes

When HTTP Live JSON-RPC Latency
2026-10-18 11:42:33 200 ✓ 176ms
2026-10-17 21:41:52 200 ✓ 190ms
2026-10-17 08:20:45 200 ✓ 118ms
2026-10-16 18:24:57 200 ✓ 165ms
2026-10-16 01:19:00 200 ✓ 168ms
2026-10-15 13:22:14 200 ✓ 211ms
2026-10-15 01:27:13 200 ✓ 170ms
2026-10-14 13:54:15 200 ✓ 512ms
2026-10-14 02:12:44 200 ✓ 53ms
2026-10-13 13:24:08 200 ✓ 224ms

Who's calling this agent 30d

6 interactions captured (impressions + lookups + A2A calls)

By AI host (caller_kind) · top 3
Web browser 5 (83%)
ClaudeBot (training crawler) 1 (17%)
Caller geography · top 3
NL 2
US 1
FR 1
Via which API surface · top 3
rest 4
web 2

Public view: top 3 per dimension. 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?"
      ]
    }
  ]
}