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fedeclavero

Mercado Libre MCP

by fedeclavero

meli_api_request

Destructive

Call official Mercado Libre API resources by absolute path to manage listings, stock, questions, and promotions; supports GET, POST, PUT, PATCH, and DELETE with real write changes.

Instructions

Llama un recurso adicional de la API oficial. path es una ruta absoluta, no URL. Para ampliar cobertura consulta documentación; las escrituras producen cambios reales. Se admiten solo cabeceras específicas documentadas.

Input Schema

NameRequiredDescriptionDefault
bodyNo
pathYes
queryNo
methodYes
headersNo
catalog_confirmedNo
explicitly_requestedNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.7/5.0
Behavior3/5

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

The annotations already declare openWorldHint=true, destructiveHint=true, and readOnlyHint=false, so the main safety profile is supplied. The description adds useful context that writes produce real changes and that only specific documented headers are accepted, but it does not cover authentication, rate limits, or side-effect details beyond that.

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?

The description is short and front-loaded, stating the core action before adding path and header constraints. It is efficient, though the phrase about consulting documentation is somewhat vague rather than directive.

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?

This is a high-complexity generic API caller with 7 parameters, no schema descriptions, no output schema, and destructive write capability. The description gives only a few safety and path hints, leaving the agent without enough information about how to construct most requests correctly.

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

Parameters2/5

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

Schema description coverage is 0% across 7 parameters, so the description must compensate. It explains that path is an absolute route and that headers are restricted, but it leaves method enum semantics, body, query, catalog_confirmed, and explicitly_requested unexplained.

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

Purpose3/5

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

The description states that it calls an additional resource of the official API, which gives a specific verb and resource type, and clarifies that path is an absolute route rather than a URL. However, it does not clearly differentiate this generic escape-hatch tool from the many specific sibling tools beyond the vague word 'adicional'.

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?

The description says to consult documentation to broaden coverage, but gives no explicit guidance on when to use this tool instead of the many specific MELI sibling tools. It also does not state when not to use it or what prerequisites are required for writes.

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