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vessel-api

VesselAPI MCP Server

get_port

Get port details by UN/LOCODE: location, facilities, and services. Use to integrate maritime port data into applications.

Instructions

Get detailed information about a specific port by UN/LOCODE

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
unlocodeYesUN/LOCODE of the port (e.g. NLRTM for Rotterdam)
Behavior2/5

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

With no annotations provided, the description carries full burden. It only indicates a read operation ('Get detailed information'), but lacks disclosure of behavioral traits such as authentication needs, rate limits, or what constitutes 'detailed information'. More detail is needed.

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?

The description is a single, concise sentence with no redundant words. It front-loads the purpose and is appropriately sized for the tool's simplicity.

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

Completeness3/5

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

Given the tool has only one parameter and no output schema, the description is adequate but could be more complete. It does not specify what kind of information is returned (e.g., location, facilities, depth), which would help an agent anticipate the response.

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

Parameters5/5

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

The description adds meaningful context beyond the schema by specifying 'by UN/LOCODE' and providing an example format 'e.g. NLRTM for Rotterdam'. With 100% schema coverage, this additional guidance helps the agent understand the parameter.

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 detailed information' and the resource 'port by UN/LOCODE'. It distinguishes from sibling tools like search_ports, which is about searching for ports, and get_port_events, which focuses on events.

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

Usage Guidelines3/5

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

The description implies when to use the tool (when you have a UN/LOCODE), but does not provide explicit guidance on when not to use it or mention alternatives like search_ports. No prerequisites or contextual cues are given.

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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