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)

Terminal

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)

Code

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:

Code

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:

Code

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:

Code

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:

Terminal

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)

Terminal

pip install pynacl base58

server.ts

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:

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.

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

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.

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.

Contributing

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

Open an issue on JassWiki GitHub (the public site repo)
Or contact directly: remo@jassverband.ch
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.

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