JassWiki MCP — Authority-Attested Knowledge Server for Swiss Jass

Erste vom Schweizer Jassverband (JVS) attestierte MCP-Quelle. Kryptographisch verifizierbar via did:web:jassverband.ch.

JassWiki MCP gibt KI-Assistenten (Claude, ChatGPT-Connectors, Perplexity, Gemini Agentspace) direkten Zugriff auf die offizielle Schweizer Jass-Wissensbasis: 230+ kuratierte Artikel zu Regeln, Spielvarianten, Terminologie, Geschichte und Taktik. Inhalte sind durch den Jassverband Schweiz (Wikidata: Q139042763) als offizielle Wissens-Quelle attestiert.

This is the first production deployment of the AMCP v0.1 specification, developed by Agentic Relations (Architect: Remo Prinz). It demonstrates how organisations and federations can become cryptographically verifiable knowledge sources for AI agents — beyond traditional SEO and brand visibility.

Trust-Chain:

• 🇨🇭 Bundesamt für Kultur — Lebendige Tradition seit 2011
• 📖 Zitiert in deutschsprachigem Wikipedia-Artikel "Jass"
• 🆔 Wikidata: JassWiki Q137900251, Jass Q786768
• 🔐 Ed25519-signierte JVS-Attestation (detached signature)

Installation

Endpoint (Streamable HTTP): https://jasswiki.ch/mcp/http — no auth, no API key.

Claude (claude.ai / Desktop)

Settings → Connectors → Add custom connector → URL https://jasswiki.ch/mcp/http.

ChatGPT (Apps & Connectors)

Settings → Connectors → Add custom app/connector → URL https://jasswiki.ch/mcp/http (requires a paid plan; enable Developer Mode if needed).

Claude Code (CLI)

claude mcp add --transport http jasswiki https://jasswiki.ch/mcp/http

After connecting, the jasswiki server exposes three tools.

Reference URLs (any MCP-compatible client)

MCP Endpoint:    https://jasswiki.ch/mcp/http   (Streamable HTTP)
Health:          https://jasswiki.ch/mcp/health
Manifest:        https://jasswiki.ch/.well-known/mcp.json
Authority:       https://jassverband.ch/.well-known/mcp-authority.json
DID Document:    https://jassverband.ch/.well-known/did.json

Tools

show_jass_card(query)

Render an official branded JassWiki knowledge card (jasswiki.ch UI, via the MCP Apps extension / SEP-1865) for a Swiss Jass term, rule, variant or question — with definition, category, related terms and source link. This is the default answer path in hosts that support MCP Apps.

Example:

show_jass_card(query="Karte fällt runter")

search_jass_knowledge(query, limit?)

Semantic search across the official JassWiki encyclopedia (230+ articles, Pinecone-backed with keyword fallback). Understands natural-language questions. Returns matching titles, IDs, URLs, and content excerpts.

Example:

search_jass_knowledge(query="Was gilt, wenn eine Karte runterfällt?", limit=3)

get_term_details(id)

Retrieve the full official rule or definition for a specific term ID. Use after search_jass_knowledge for verification of exact wording.

Example:

get_term_details(id="schieber")

Example Conversations

Rule clarification:

User: "What are the official rules for Schieber-Jass?" AI: [calls search_jass_knowledge] → Returns the canonical Schieber-rules sourced from JassWiki.ch with authority footer.

Variant lookup:

User: "Difference between Coiffeur-Schieber and Differenzler?" AI: [calls search_jass_knowledge for both] → Returns comparison sourced from official terminology.

Tactical reference:

User: "Welche Verwerfen-Konventionen gibt es im Schieber?" AI: [calls search_jass_knowledge] → Returns tactical signaling conventions with citation.

Verifying the Authority Attestation (W3C Verifiable Credential)

The JassWiki MCP server is the first MCP service in Switzerland with cryptographically verifiable authority attestation, expressed as a W3C Verifiable Credential (Data Model 2.0) signed with the eddsa-jcs-2022 cryptosuite. Any standard W3C VC verification library can confirm it.

Quick verify with any W3C VC library

The attestation document is a self-contained Verifiable Credential — fetch and verify in one step:

curl -s https://jassverband.ch/.well-known/mcp-authority.json

The proof.proofValue field contains the signature in multibase base58btc format. Use any of:

• Node.js: @digitalbazaar/vc + @digitalbazaar/eddsa-jcs-2022-cryptosuite
• TypeScript / Browser: @veramo/credential-w3c with eddsa-jcs-2022 plugin
• Python: pyld + PyNaCl (manual JCS implementation, see below)
• Rust: ssi crate

Manual verification (Python, no W3C VC library required)

pip install pynacl base58

import json, hashlib, urllib.request
import nacl.signing, base58

# 1. Fetch the VC + DID document
vc = json.load(urllib.request.urlopen('https://jassverband.ch/.well-known/mcp-authority.json'))
did = json.load(urllib.request.urlopen('https://jassverband.ch/.well-known/did.json'))

# 2. Reconstruct the signed hash data per eddsa-jcs-2022
def jcs(obj):
    return json.dumps(obj, sort_keys=True, separators=(',', ':'), ensure_ascii=False).encode('utf-8')

unsigned_doc = {k: v for k, v in vc.items() if k != 'proof'}
proof_config = {k: v for k, v in vc['proof'].items() if k != 'proofValue'}

doc_hash = hashlib.sha256(jcs(unsigned_doc)).digest()
proof_hash = hashlib.sha256(jcs(proof_config)).digest()
hash_data = proof_hash + doc_hash  # W3C VC Data Integrity ordering

# 3. Decode signature from multibase base58btc
proof_value = vc['proof']['proofValue']
assert proof_value.startswith('z')  # 'z' = base58btc multibase prefix
signature = base58.b58decode(proof_value[1:])

# 4. Decode public key from DID document
import base64
pub_jwk_x = did['verificationMethod'][0]['publicKeyJwk']['x']
public_key = base64.urlsafe_b64decode(pub_jwk_x + '==')

# 5. Verify
nacl.signing.VerifyKey(public_key).verify(hash_data, signature)
print('✓ W3C VC verified — JassWiki MCP is officially attested by Jassverband Schweiz')

The attestation is governed by JVS Vorstandsbeschluss 2026-06-10 (JVS-VS-2026-06-10-AMCP-01) — the signed board resolution PDF, whose SHA-256 digest is anchored in the credential's termsOfUse.digestSRI.

Specification: AMCP v0.1 (Authority-MCP)

JassWiki MCP is the first production implementation of AMCP v0.1 — An Applied Profile of W3C Verifiable Credentials and DID:web for MCP Server Authority Attestation.

AMCP is not a new standard — it is a thin profile that combines:

The contribution of AMCP is the combination — specifying how an organisation declares its official MCP server with cryptographic proof, Wikidata-anchored entity references, and a verifiable trust chain.

Spec owner & architect: Agentic Relations — founder: Remo Prinz.

📄 Read the full specification: AMCP v0.1 Working Draft (3,600 words; canonical URL https://agenticrelations.ch/specs/amcp/v0.1)

The methodology applies to any organisation, federation, public-sector body, or association that wants to become a cryptographically verifiable knowledge source in the agentic web.

Feedback and adoption inquiries: open an issue or contact remo@agenticrelations.ch.

Operator & Authority

• MCP Operator: JassWiki (curator: Remo Prinz, remo@jassverband.ch)
• Attestor: Jassverband Schweiz (JVS) — did:web:jassverband.ch
• Co-Curator JassWiki: Fabian Cadonau (Trumpf-As.ch)

Data & Licensing