@cellar-door/mcp-server

@cellar-door/mcp-server

MCP (Model Context Protocol) server that exposes cellar-door-exit and cellar-door-entry verifiable markers as AI-native tools. Any MCP-compatible client — Claude Desktop, Cursor, Windsurf, or custom agents — can create, sign, and verify EXIT and ENTRY markers.

Tools

EXIT Tools

Tool	Description
generate_identity	Generate an Ed25519 DID keypair for signing
quick_exit	One-shot: create + sign a departure marker
create_exit_marker	Create and sign a marker with full options
verify_exit_marker	Verify a marker from JSON

ENTRY Tools

Tool	Description
verify_and_admit	Verify EXIT marker, evaluate admission policy, create arrival
evaluate_admission	Check if EXIT marker meets an admission policy
verify_transfer	Verify a complete EXIT→ENTRY transfer chain
list_admission_policies	List available admission policy presets

Quick Start

npm install @cellar-door/mcp-server

Claude Desktop

{
  "mcpServers": {
    "cellar-door": {
      "command": "npx",
      "args": ["@cellar-door/mcp-server"]
    }
  }
}

Example Tool Calls

Quick Exit

{
  "name": "quick_exit",
  "arguments": { "origin": "did:example:my-agent", "reason": "Task complete" }
}

Verify and Admit

{
  "name": "verify_and_admit",
  "arguments": {
    "exitMarkerJson": "{...exit marker JSON...}",
    "destination": "did:example:new-platform",
    "admissionPolicy": "OPEN_DOOR"
  }
}

Response:

{
  "admitted": true,
  "arrivalMarker": { "..." },
  "exitMarkerId": "exit:...",
  "continuity": { "valid": true, "errors": [] }
}

Evaluate Admission

{
  "name": "evaluate_admission",
  "arguments": {
    "exitMarkerJson": "{...}",
    "policy": "STRICT"
  }
}

List Admission Policies

{ "name": "list_admission_policies", "arguments": {} }

Response:

{
  "policies": {
    "OPEN_DOOR": { "description": "Accept everything with a valid signature", "requireVerifiedDeparture": true },
    "STRICT": { "description": "Voluntary only, <24h old, requires lineage + stateSnapshot", "..." },
    "EMERGENCY_ONLY": { "description": "Accept only emergency exits", "..." }
  }
}

⚠️ Disclaimer

WARNING: Automated admission decisions should be reviewed by platform operators. This integration does not constitute legal advice. Platforms are responsible for their own admission policies and the consequences of admitting agents.

License

Apache-2.0