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PonClick

marktplaats-mcp

by PonClick

get_seller_info

Fetch a Marktplaats seller's ratings, verification status, and profile statistics by numeric seller ID to evaluate trustworthiness before buying.

Instructions

Get detailed information about a seller including ratings and verification status.

Args: seller_id: The seller's numeric ID

Returns: Seller profile with ratings, verification status, and statistics

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
seller_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.4/5.0
Behavior3/5

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

With no annotations, the description carries the full behavioral burden. It does disclose that this is a read that returns a seller profile with ratings, verification status, and statistics, but says nothing about authentication requirements, rate limits, or what happens for an unknown seller_id.

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

Conciseness4/5

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

Front-loaded with the core purpose in the first sentence. The 'Args/Returns' blocks are slightly padded and the Returns line partly duplicates the output schema, but the overall size is appropriate for a simple getter.

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

Completeness4/5

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

For a single-parameter read tool with an output schema that documents the return shape, the description supplies enough to call it correctly. Missing only edge-case behavior such as invalid or missing seller IDs, which is a minor gap.

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

Parameters4/5

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

Schema description coverage is 0%, so the description must compensate, and it does: it explains that seller_id is the seller's numeric ID, which clarifies the bare integer property. Only one parameter exists, so there is little room for further semantics.

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

Purpose4/5

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

States a specific verb (Get) and resource (seller info) and enumerates the payload (ratings, verification status, statistics). The resource is naturally distinct from the listing/category siblings, though the description never explicitly contrasts itself with them.

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 when-to-use guidance, no prerequisites, and no mention of alternatives such as get_listing_details. Retrieval intent is implied by the verb 'Get' and the single ID argument, but nothing tells the agent when this tool is the right choice.

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