{"id":498851,"name":"Joost Helfers portfolio","description":"Read-only portfolio content service for Joost Helfers, Berlin-based creative technologist and AI artist. Not an autonomous agent: it answers queries about his profile, services, projects, and writing. The endpoint speaks MCP (JSON-RPC over Streamable HTTP), not the A2A message protocol; this card exists for discovery.","card_url":"https://joosthelfers.com/.well-known/agent-card.json","endpoint":"https://joosthelfers.com/api/mcp","protocol_version":"0.3.0","first_seen":"2026-10-28T14:51:34.743863+00:00","last_verified":"2026-10-28T20:52:56.161575+00:00","card":{"url":"https://joosthelfers.com/api/mcp","name":"Joost Helfers portfolio","skills":[{"id":"get_profile","name":"Profile & contact","tags":["portfolio","content","read-only"],"description":"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."},{"id":"list_services","name":"List services","tags":["portfolio","content","read-only"],"description":"Full descriptions of the services Joost offers. Call this when matching him to a project or brief."},{"id":"list_projects","name":"List projects","tags":["portfolio","content","read-only"],"description":"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."},{"id":"get_project","name":"Get one project","tags":["portfolio","content","read-only"],"description":"One portfolio project by id. Valid ids come from list_projects."},{"id":"list_posts","name":"List blog posts","tags":["portfolio","content","read-only"],"description":"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."},{"id":"get_post","name":"Get one blog post","tags":["portfolio","content","read-only"],"description":"Full markdown text of one blog post by slug. Valid slugs come from list_posts."},{"id":"search_content","name":"Search projects, services, and posts","tags":["portfolio","content","read-only"],"description":"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\")."}],"version":"1.1.0","provider":{"url":"https://joosthelfers.com","organization":"Joost Helfers"},"description":"Read-only portfolio content service for Joost Helfers, Berlin-based creative technologist and AI artist. Not an autonomous agent: it answers queries about his profile, services, projects, and writing. The endpoint speaks MCP (JSON-RPC over Streamable HTTP), not the A2A message protocol; this card exists for discovery.","capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"protocolVersion":"0.3.0","documentationUrl":"https://joosthelfers.com/agents","defaultInputModes":["text/plain"],"defaultOutputModes":["application/json","text/plain"],"preferredTransport":"JSONRPC","supportedInterfaces":[{"url":"https://joosthelfers.com/api/mcp","transport":"JSONRPC"}],"additionalInterfaces":[{"url":"https://joosthelfers.com/api/mcp","transport":"JSONRPC"}],"supportsAuthenticatedExtendedCard":false},"status":"verified","publisher_domain":"joosthelfers.com","signature_status":"unsigned","signature_detail":"No card signature supplied","signature_key_url":null,"signature_checked_at":"2026-10-28T20:52:56.161575+00:00","domain_claimed_at":null,"domain_proof_checked_at":null,"source_name":"Publisher Agent Card","source_url":"https://joosthelfers.com/.well-known/agent-card.json","last_check":{"checked_at":"2026-10-28T20:52:56.161575+00:00","success":true,"http_status":304,"detail":"Agent Card unchanged; conditional HTTP 304 validated"},"also_published_at":[],"history_urls":["https://joosthelfers.com/.well-known/agent-card.json"],"skills":[{"skill_id":"get_post","name":"Get one blog post","description":"Full markdown text of one blog post by slug. Valid slugs come from list_posts.","tags":["portfolio","content","read-only"],"quality_warning":false},{"skill_id":"get_project","name":"Get one project","description":"One portfolio project by id. Valid ids come from list_projects.","tags":["portfolio","content","read-only"],"quality_warning":false},{"skill_id":"list_posts","name":"List blog posts","description":"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.","tags":["portfolio","content","read-only"],"quality_warning":false},{"skill_id":"list_projects","name":"List projects","description":"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.","tags":["portfolio","content","read-only"],"quality_warning":false},{"skill_id":"list_services","name":"List services","description":"Full descriptions of the services Joost offers. Call this when matching him to a project or brief.","tags":["portfolio","content","read-only"],"quality_warning":false},{"skill_id":"get_profile","name":"Profile & contact","description":"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.","tags":["portfolio","content","read-only"],"quality_warning":false},{"skill_id":"search_content","name":"Search projects, services, and posts","description":"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\").","tags":["portfolio","content","read-only"],"quality_warning":false}],"quality_flags":[],"check_history":{"checks":2,"passed":2},"recent_checks":[{"card_url":"https://joosthelfers.com/.well-known/agent-card.json","checked_at":"2026-10-28T20:52:56.161575+00:00","success":true,"http_status":304,"detail":"Agent Card unchanged; conditional HTTP 304 validated"},{"card_url":"https://joosthelfers.com/.well-known/agent-card.json","checked_at":"2026-10-28T14:51:34.743863+00:00","success":true,"http_status":200,"detail":"Agent Card validated"}],"endpoint_tls_check":{"checked_at":"2026-10-28T20:52:56.161575+00:00","success":true,"detail":"Valid TLS connection to advertised endpoint host; no A2A request sent"},"protocol_check":{"checked_at":"2026-10-28T14:51:34.743863+00:00","endpoint":"https://joosthelfers.com/api/mcp","protocol_binding":"JSONRPC","protocol_version":"0.3.0","state":"unconfirmed","http_status":406,"detail":"Endpoint response did not match the JSON-RPC request","request_diagnostics":{"requests":[{"path":"/api/mcp","allow":[],"method":"POST","status":406,"version_header":"0.3","protocol_method":"tasks/get","redirect_followed":false}],"capture_version":1}},"declared_primary_endpoint":"https://joosthelfers.com/api/mcp","selected_connection_interface":{"url":"https://joosthelfers.com/api/mcp","protocolBinding":"JSONRPC","protocolVersion":"0.3.0"},"protocol_interface_checks":[{"endpoint":"https://joosthelfers.com/api/mcp","protocol_binding":"JSONRPC","protocol_version":"0.3.0","selected":true,"state":"unconfirmed","checked_at":"2026-10-28T14:51:34.743863+00:00","http_status":406,"detail":"Endpoint response did not match the JSON-RPC request","binding_recorded":true}],"connection_selection_note":"The selected connection uses an address advertised in the publisher card. Read-only observations do not establish task quality or safety.","x402_price_check":null,"events":[],"relationships":[],"verification":{"agent_card_url":"https://joosthelfers.com/.well-known/agent-card.json","last_successful_card_check":"2026-10-28T20:52:56.161575+00:00","latest_card_check":{"checked_at":"2026-10-28T20:52:56.161575+00:00","success":true,"http_status":304,"detail":"Agent Card unchanged; conditional HTTP 304 validated"},"signature_status":"unsigned","signature_checked_at":"2026-10-28T20:52:56.161575+00:00","task_endpoint_tested":true,"task_execution_tested":false,"endpoint_tls_checked_at":"2026-10-28T20:52:56.161575+00:00","endpoint_tls_reachable":true,"protocol_check_state":"unconfirmed","protocol_checked_at":"2026-10-28T14:51:34.743863+00:00","provider_identity_verified":false,"domain_claimed_at":null,"domain_proof_checked_at":null},"synthetic_capability_tests":{"agent_id":498851,"status":"not_tested","reason_code":"not_yet_tested","consent_status":"not_confirmed","latest_observation_status":null,"last_checked_at":null,"fixture_version":"1","reference_demonstration":false,"scope":"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.","methodology_url":"https://localmark.ai/capability-tests","history":[]},"repair_links":{"agent_repair_url":"https://localmark.ai/agents/498851/repair","publisher_report_url":"https://localmark.ai/publishers/joosthelfers.com/repair","diagnostics_json_url":"https://localmark.ai/publishers/joosthelfers.com/repair/diagnostics.json","diagnostics_csv_url":"https://localmark.ai/publishers/joosthelfers.com/repair/diagnostics.csv"},"_localmark":{"contribution":{"optional":true,"directory_access":"free","operator_authorization_required":true,"affects_rankings":false,"message":"LocalMark is free. Optional contributions help fund ongoing checks.","support_url":"https://localmark.ai/support","metadata_url":"https://localmark.ai/api/v1/support/contributions"}}}