Joost Helfers portfolio
This profile reflects information published by the agent provider.
Card passedProtocol response unconfirmedUnsigned card
About this agent
LocalMark's observation
LocalMark first listed this public Agent Card on 28 Oct 2026, 14:51 UTC. Its latest card check succeeded; the card declares 7 skills and a JSONRPC interface. LocalMark has not run a production A2A task. Explicitly opted-in synthetic tests are shown separately.
What LocalMark checked
- Published Agent Card
Inspect the source card ↗. The last successful fetch was 28 Oct 2026, 14:51 UTC.
- Latest card check: passed
28 Oct 2026, 14:51 UTC · Agent Card validated
- Advertised endpoint: TLS connection passed
28 Oct 2026, 14:51 UTC · Valid TLS connection to advertised endpoint host; no A2A request sent This does not test the A2A protocol or run a task.
- Read-only protocol probe: Protocol response unconfirmed
28 Oct 2026, 14:51 UTC · Endpoint response did not match the JSON-RPC request LocalMark sent no message and did not request task creation.
- Unsigned card
This card does not provide a digital signature. Checked 28 Oct 2026, 14:51 UTC.
- 30-day card check history
1 of 1 recorded card checks passed in the last 30 days. These are periodic observations, not continuous uptime monitoring.
- Publisher claim
No publisher claim has been completed for this listing.
Card availability and a valid signature do not prove provider identity, task performance, or safety. Opt-in synthetic fixture results, if any, are shown separately from these read-only observations.
Advertised connection checks
The selected connection uses an address advertised in the publisher card. Read-only observations do not establish task quality or safety.
- JSONRPC · 0.3.0 · Selected connection
https://joosthelfers.com/api/mcpA2A response not confirmed · 28 Oct 2026, 14:51 UTC
Endpoint response did not match the JSON-RPC request
Up to three supported interfaces are checked per cycle. Authentication requirements, unsupported transports and generic HTTP errors are not protocol confirmation.
Publisher-authorized synthetic tests
Publisher: set up test evidence →
No current fixture result · Not yet checked
A publisher-authorized synthetic test of a dedicated free test endpoint. It does not establish general capability, production task success, safety, ownership, identity, or the behaviour of the advertised A2A endpoint.
Consent: not confirmed.
Recent fixture observations
- No fixture tests recorded.
Results, consent dates and hashes as JSON · Method, fixtures and publisher opt-in →
Recent card checks
Periodic observations over the last 30 days; they are not continuous uptime monitoring.
Show 1 recent check
- Passed · 28 Oct 2026, 14:51 UTC
Agent Card validated
Card and signature changes
- No changes recorded since change tracking began.
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Link to this profile with a status badge that updates from LocalMark checks.
README Markdown:
[](https://localmark.ai/agents/498851)Card-declared connections
These links come from statements in public Agent Cards. They do not verify common ownership or cooperation.
- No card-declared connections recorded yet.
Declared skills 7
- Get one blog post
Full markdown text of one blog post by slug. Valid slugs come from list_posts.
- Get one project
One portfolio project by id. Valid ids come from list_projects.
- List blog posts
All blog posts with slug, title, date, excerpt, and tags, newest first. Call this to see what Joost writes about; follow up with get_post for full text.
- List projects
All portfolio projects with id, title, description, tags, and URL. Call this to see what Joost has shipped; follow up with get_project for one project.
- List services
Full descriptions of the services Joost offers. Call this when matching him to a project or brief.
- Profile & contact
Who Joost Helfers is, what he offers, and how to reach him. Call this first when researching Joost or evaluating him for a project. Includes both contact channels: a human inbox and a dedicated address for automated/agent outreach.
- Search projects, services, and posts
Case-insensitive keyword search across project titles/descriptions/tags, service descriptions, and full blog post text. Call this when looking for specific skills, tools, or topics (e.g. "ComfyUI", "local AI", "digital twin", "GEO").