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sakshsiw

Amazon SP-API MCP Server

by sakshsiw

execute-external-api

Call non-Amazon REST APIs by specifying URL, method, headers, query parameters, body, and timeout for external HTTP requests.

Instructions

Execute HTTP requests to external REST APIs (non-Amazon APIs)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesFull URL of the external API endpoint (required)
bodyNoRequest body (for POST, PUT, PATCH)
methodNoHTTP methodGET
headersNoRequest headers
timeoutNoRequest timeout in milliseconds (default: 30000)
queryParamsNoQuery parameters to append to URL

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden, and it discloses almost nothing: no statement on authentication requirements, whether headers must carry credentials, rate limits, redirect handling, or how responses/errors are surfaced. For a generic outbound HTTP executor this is a substantial gap.

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?

A single front-loaded sentence with zero filler, so every word earns its place. It is arguably too terse for a 6-parameter network tool, but as a conciseness measure it is efficient.

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?

With 6 parameters including nested objects, no output schema, and no annotations, the definition should explain auth requirements, response format, and error behavior. None of that is present, leaving an agent without the context needed to call this outbound-request tool safely.

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 description coverage is 100% and every parameter (url, body, method, headers, timeout, queryParams) is documented in the schema, so baseline 3 applies. The description adds no extra meaning such as body serialization format or how headers interact with auth.

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 (Execute) and resource (HTTP requests to external REST APIs), and the parenthetical '(non-Amazon APIs)' meaningfully scopes it away from the sibling execute-sp-api. It stops short of naming the alternative tool outright, but an agent can still route correctly.

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 '(non-Amazon APIs)' qualifier implies when to use this over execute-sp-api, but there is no explicit when-to-use rule, no mention of prerequisites (credentials, auth setup), and no exclusion beyond the Amazon boundary. Usage is inferable but not stated.

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