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index observed

mcp

Screen any vessel by IMO for sanctions, ownership opacity and vetting grade. Keyless check included.

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
90%
Naming quality
91%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~2,739Tokens (tool definitions)
~3.7 KBTypical response size
Significant attention impact (2.14% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "@arcnautical/mcp"
      ]
    }
  }
}

Runnable packages

npm@arcnautical/mcp0.2.1stdio

Remote endpoints

https://mcp.arcnautical.com/mcpstreamable-http

What it can do

Tool inventory

Tools (7)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢check_vessel(imo)

Screen one vessel by IMO number against OFAC SDN, EU, UN, UK OFSI and OpenSanctions, with an ownership-opacity score and an A–E vetting grade from port-state-control history. Works with no API key. Rate-limited to 100 requests per hour per IP. Returns the VERDICT SUMMARY only; for every sanctions match with its source list and confidence class use screen_vessel (needs a key).

Input Schema

{
  "type": "object",
  "properties": {
    "imo": {
      "type": "string",
      "pattern": "^\\d{7}$",
      "description": "Seven-digit IMO number of the vessel"
    }
  },
  "required": [
    "imo"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "imo": {
      "type": "string",
      "description": "The seven-digit IMO number screened"
    },
    "sanctions": {
      "type": "object",
      "properties": {
        "status": {
          "type": "string",
          "description": "RED | AMBER | GREEN | INCOMPLETE"
        },
        "detail": {
          "type": "string",
          "description": "One sentence explaining the status"
        },
        "coverageComplete": {
          "type": "boolean",
          "description": "false when a supplementary list was unavailable — re-screen before relying on a GREEN"
        }
      },
      "required": [
        "status"
      ],
      "additionalProperties": true
    },
    "ownership": {
      "type": "object",
      "properties": {
        "opacity": {
          "type": [
            "string",
            "null"
          ]
        },
        "score": {
          "type": [
            "number",
            "null"
          ]
        }
      },
      "additionalProperties": true
    },
    "vetting": {
      "type": "object",
      "properties": {
        "grade": {
          "type": [
            "string",
            "null"
          ]
        },
        "score": {
          "type": [
            "number",
            "null"
          ]
        },
        "status": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "assessed": {
      "type": "boolean",
      "description": "false means ownership and vetting are defaults, not findings"
    },
    "checkedAt": {
      "type": "string",
      "description": "ISO-8601 time the sources were read; designations change daily"
    },
    "fullReport": {
      "type": "string",
      "description": "Human-readable report URL for this hull"
    },
    "rate_limit": {
      "type": "object",
      "properties": {
        "limit": {
          "type": [
            "number",
            "null"
          ]
        },
        "remaining": {
          "type": [
            "number",
            "null"
          ]
        },
        "reset": {
          "type": [
            "string",
            "null"
          ]
        }
      },
      "required": [
        "limit",
        "remaining",
        "reset"
      ],
      "additionalProperties": false,
      "description": "Keyless allowance for the caller's address"
    }
  },
  "required": [
    "imo",
    "sanctions",
    "checkedAt",
    "rate_limit"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢find_port(query, limit)

Resolve a port name, country or partial UN/LOCODE to the LOCODEs the routing engine knows. Routes are addressed by LOCODE, so call this before score_voyage rather than guessing a code. Works with no API key.

Input Schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 2,
      "description": "Port name, country, or LOCODE fragment, e.g. \"rotterdam\", \"NLRTM\", \"Piraeus\""
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 20,
      "description": "Maximum matches to return (default 5)"
    }
  },
  "required": [
    "query"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "ports": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "locode": {
            "type": "string",
            "description": "UN/LOCODE, e.g. NLRTM"
          },
          "name": {
            "type": "string"
          },
          "country": {
            "type": "string"
          }
        },
        "required": [
          "locode",
          "name"
        ],
        "additionalProperties": true
      },
      "description": "Best matches first"
    }
  },
  "required": [
    "ports"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢screen_vessel(imo, vessel_name, customer_reference, include_vetting)

The authenticated screening record for one vessel: every sanctions match with its source list, programme and confidence class, ownership opacity, the graded vetting factors, per-source freshness, and a retained record id. Needs ARCNAUTICAL_API_KEY. Metered: a new self-serve key includes a one-time free allowance of live screenings; get_usage reports what is left. The same vessel asked again on the same day replays the stored record free. If the result is INCOMPLETE for identity, call again with vessel_name.

Input Schema

{
  "type": "object",
  "properties": {
    "imo": {
      "type": "string",
      "pattern": "^\\d{7}$",
      "description": "Seven-digit IMO number of the vessel"
    },
    "vessel_name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200,
      "description": "Only when a previous screen was INCOMPLETE for identity; a name you can confirm"
    },
    "customer_reference": {
      "type": "string",
      "maxLength": 128,
      "description": "Your own reference (order id, voyage id); echoed on the record"
    },
    "include_vetting": {
      "type": "boolean",
      "description": "false skips the vetting grade for a faster sanctions-only screen"
    }
  },
  "required": [
    "imo"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Screening record id, retained ten years"
    },
    "imo": {
      "type": "string"
    },
    "sanctions": {
      "type": "object",
      "properties": {
        "status": {
          "type": "string",
          "description": "RED | AMBER | GREEN | INCOMPLETE"
        },
        "detail": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "ownership": {
      "type": "object",
      "properties": {
        "opacity": {
          "type": [
            "string",
            "null"
          ]
        },
        "score": {
          "type": [
            "number",
            "null"
          ]
        }
      },
      "additionalProperties": true
    },
    "vetting": {
      "type": "object",
      "properties": {
        "grade": {
          "type": [
            "string",
            "null"
          ]
        },
        "status": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "screened_at": {
      "type": "string",
      "description": "ISO-8601 time the sources were read"
    },
    "vessel_name": {
      "type": [
        "string",
        "null"
      ]
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢screen_vessels(imos, include_vetting)

Batch-screen a list of IMO numbers and wait for the results (up to two minutes). Returns one verdict per hull plus the batch status. Needs ARCNAUTICAL_API_KEY. Each hull spends one screening unit unless it was already screened today.

Input Schema

{
  "type": "object",
  "properties": {
    "imos": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^\\d{7}$",
        "description": "Seven-digit IMO number of the vessel"
      },
      "minItems": 1,
      "maxItems": 50,
      "description": "Up to 50 seven-digit IMO numbers"
    },
    "include_vetting": {
      "type": "boolean",
      "description": "false skips the vetting grade for a faster sanctions-only screen"
    }
  },
  "required": [
    "imos"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "batch": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string"
        },
        "status": {
          "type": "string",
          "description": "queued | running | completed | partial | failed"
        }
      },
      "additionalProperties": true,
      "description": "The batch as last read"
    },
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "imo": {
            "type": [
              "string",
              "null"
            ]
          },
          "status": {
            "type": "string"
          },
          "screening_id": {
            "type": [
              "string",
              "null"
            ]
          },
          "result_body": {
            "anyOf": [
              {
                "type": "object",
                "properties": {
                  "sanctions": {
                    "type": "object",
                    "properties": {
                      "status": {
                        "type": "string"
                      }
                    },
                    "additionalProperties": true
                  }
                },
                "additionalProperties": true
              },
              {
                "type": "null"
              }
            ]
          }
        },
        "additionalProperties": true
      },
      "description": "One row per hull"
    }
  },
  "required": [
    "batch",
    "items"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_screening(id)

Fetch a stored screening record by id — the audit copy, retained ten years. Needs ARCNAUTICAL_API_KEY.

Input Schema

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "format": "uuid",
      "description": "Screening id returned by screen_vessel or in a batch item"
    }
  },
  "required": [
    "id"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Screening record id, retained ten years"
    },
    "imo": {
      "type": "string"
    },
    "sanctions": {
      "type": "object",
      "properties": {
        "status": {
          "type": "string",
          "description": "RED | AMBER | GREEN | INCOMPLETE"
        },
        "detail": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "ownership": {
      "type": "object",
      "properties": {
        "opacity": {
          "type": [
            "string",
            "null"
          ]
        },
        "score": {
          "type": [
            "number",
            "null"
          ]
        }
      },
      "additionalProperties": true
    },
    "vetting": {
      "type": "object",
      "properties": {
        "grade": {
          "type": [
            "string",
            "null"
          ]
        },
        "status": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "screened_at": {
      "type": "string",
      "description": "ISO-8601 time the sources were read"
    },
    "vessel_name": {
      "type": [
        "string",
        "null"
      ]
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢score_voyage(origin, destination, passage, vessel_type, load_condition, ...)

Route risk between two ports (UN/LOCODEs): a 0–100 score, risk level, the signals driving it (war-risk areas, piracy, chokepoints, weather, sanctions exposure of transited EEZs), sea days, confidence and any missing sources. On lanes that can go either way round Africa it also scores the other passage (Suez or Cape) in `alternatives`. Resolve port names with find_port first. Needs ARCNAUTICAL_API_KEY; see get_usage for the allowance.

Input Schema

{
  "type": "object",
  "properties": {
    "origin": {
      "type": "string",
      "pattern": "^[A-Za-z]{5}$",
      "description": "Origin UN/LOCODE, e.g. NLRTM"
    },
    "destination": {
      "type": "string",
      "pattern": "^[A-Za-z]{5}$",
      "description": "Destination UN/LOCODE, e.g. CNSHA"
    },
    "passage": {
      "type": "string",
      "enum": [
        "shortest",
        "suez",
        "cape"
      ],
      "description": "Which way round Africa to score: shortest (default; Suez on Asia-Europe), suez or cape. Refused on lanes with no such passage"
    },
    "vessel_type": {
      "type": "string",
      "enum": [
        "container",
        "bulk",
        "tanker",
        "lng",
        "general"
      ],
      "description": "Vessel class; changes which threat signals weigh most (default: general)"
    },
    "load_condition": {
      "type": "string",
      "enum": [
        "laden",
        "ballast"
      ],
      "description": "laden or ballast; affects exposure on the transit (with vessel_type)"
    },
    "speed_knots": {
      "type": "number",
      "minimum": 8,
      "maximum": 25,
      "description": "Planned service speed, 8-25 knots; sets route.transit_days (default 14), and with vessel_type times the weather"
    },
    "dwt_tonnes": {
      "type": "number",
      "minimum": 1,
      "maximum": 600000,
      "description": "Deadweight in tonnes; accepted, but it does not change the score today"
    },
    "customer_reference": {
      "type": "string",
      "maxLength": 128,
      "description": "Your own reference (voyage id, fixture); echoed on the assessment"
    }
  },
  "required": [
    "origin",
    "destination"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Assessment id"
    },
    "score": {
      "type": "number",
      "description": "0-100, higher is riskier"
    },
    "risk_level": {
      "type": "string",
      "description": "low | moderate | elevated | high | critical"
    },
    "confidence": {
      "type": "number",
      "description": "0-1"
    },
    "missing_sources": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Signals that could not be read for this assessment"
    },
    "route": {
      "type": "object",
      "properties": {
        "distance_nm": {
          "type": "number"
        }
      },
      "additionalProperties": true
    },
    "signals": {}
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_usage

Live and test usage, remaining allowance, reset time, batch limits and monitor capacity for the configured key.

Input Schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "environment": {
      "type": "string",
      "description": "live | test"
    },
    "assessments": {
      "type": "object",
      "properties": {},
      "additionalProperties": true,
      "description": "Allowance, used, remaining and reset per environment"
    },
    "screenings": {
      "type": "object",
      "properties": {},
      "additionalProperties": true
    },
    "limits": {
      "type": "object",
      "properties": {},
      "additionalProperties": true
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

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