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)

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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

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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")

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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.

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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.

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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:

Layer	Existing Standard
Identity of the authority	W3C DID Core (did:web method)
Cryptographic envelope	W3C Verifiable Credentials Data Model 2.0
Signature suite	eddsa-jcs-2022 (Ed25519 + JCS canonicalization)
Entity descriptions	Schema.org + JSON-LD
Canonical entity IDs	Wikidata QIDs
Server protocol	Anthropic MCP
Discovery	HTTP Link header (RFC 8288) + .well-known/

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.

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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)

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Data & Licensing

• Content: CC-BY-SA 4.0
• Bulk corpus: HuggingFace JassWiki/jasswiki-corpus (JSONL)
• SKOS Taxonomy: jasswiki.ch/dataset/taxonomie.jsonld
• Attestation documents (mcp.json, did.json, mcp-authority.json): CC0

Attribution must include the JassWiki.ch link and indicate any modifications.

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Status & Reliability

• Production since: January 2026
• Hosting: Firebase Cloud Functions, region us-central1 (low-latency global)
• Languages supported: German (primary), French, Italian, English (ongoing expansion)
• Uptime SLA: Best-effort (99.5%+ historical)

For service incidents or schema changes, watch the GitHub releases.

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Contributing

JassWiki content is curated. To suggest factual corrections, terminology updates, or new variants:

1. Open an issue on JassWiki GitHub (the public site repo)
2. Or contact directly: remo@jassverband.ch
3. New entries are reviewed by JVS (4-eyes principle) before publishing

The MCP server itself (this repository) accepts PRs for documentation improvements, examples, and submission metadata.

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Erste öffentlich-rechtliche Authority-MCP der Schweiz. The first publicly attested MCP knowledge server in Switzerland.