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com.arcnautical/mcp

by arcnautical.com · remote · local (npm) · no sign-in to list tools · v0.2.1 · published by com.arcnautical

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

Changes · 4
CompareRegistry entry

7 tools: 4 change things and 3 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http arcnautical https://mcp.arcnautical.com/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

7 tools

Changes things 4Claude Code: ask
  • check_vesselScreen 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.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
    • idempotentHint: true
  • score_voyageRoute 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), c…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    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), confidence and any missing sources. Resolve port names with find_port first. Needs ARCNAUTICAL_API_KEY; 10,000 assessments a month are included with a self-serve key.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: true
    • idempotentHint: true
  • screen_vesselThe authenticated screening record for one vessel: every sanctions match with its source list, programme and confidence class, ownership opacity, the graded vetting factors, per-so…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: true
    • idempotentHint: true
  • screen_vesselsBatch-screen a list of IMO numbers and wait for the results (up to two minutes).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • openWorldHint: true
    • idempotentHint: true
Only reads 3Claude Code: allow
  • find_portResolve a port name, country or partial UN/LOCODE to the LOCODEs the routing engine knows.No findings

    Why it is in this group

    • The name "find_port" says "find": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
    • idempotentHint: true
  • get_screeningFetch a stored screening record by id — the audit copy, retained ten years.No findings

    Why it is in this group

    • The name "get_screening" says "get": a word for reading.
    Description, as the server wrote it
    Fetch a stored screening record by id — the audit copy, retained ten years. Needs ARCNAUTICAL_API_KEY.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
    • idempotentHint: true
  • get_usageLive and test usage, remaining allowance, reset time, batch limits and monitor capacity for the configured key.No findings

    Why it is in this group

    • The name "get_usage" says "get": a word for reading.
    Description, as the server wrote it
    Live and test usage, remaining allowance, reset time, batch limits and monitor capacity for the configured key.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
    • idempotentHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.2.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http arcnautical https://mcp.arcnautical.com/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__arcnautical__find_port",
      "mcp__arcnautical__get_screening",
      "mcp__arcnautical__get_usage"
    ],
    "ask": [
      "mcp__arcnautical__check_vessel",
      "mcp__arcnautical__screen_vessel",
      "mcp__arcnautical__screen_vessels",
      "mcp__arcnautical__score_voyage"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as arcnautical. Review it before you use it.