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vessel-api

VesselAPI MCP Server

get_vessel_ownership

Identify the owner, manager, and operator of any vessel using its IMO number, MMSI, or vessel ID.

Instructions

Get the ownership details for a vessel (owner, manager, operator)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
vesselIdYesVessel identifier (IMO number by default)
idTypeNoIdentifier type: imo (default), mmsi, or vesselId
Behavior1/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, and the description fails to disclose any behavioral traits such as read-only nature, required permissions, rate limits, or data recency. The description only states what it returns without any operational context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence, front-loaded with the key action and resource, no redundancy. Every word serves a purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity (simple lookup with 2 params, no output schema) and many sibling tools, the description is incomplete. It does not specify the structure of the returned data, error conditions, or how it differs from other vessel tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with both parameters described. The description adds the hint of 'owner, manager, operator' but does not provide additional meaning beyond the schema. Baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Get' and the resource 'ownership details for a vessel', and specifies the included items ('owner, manager, operator'). It effectively distinguishes from sibling tools like get_vessel_classification or get_vessel_position.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives. There is no mention of when not to use it, prerequisites, or comparisons to other tools like get_vessel, which might also return ownership data.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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