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thenavidm

Gumroad MCP Server

by thenavidm

Verify license

verify_license
Read-onlyIdempotent

Validate a Gumroad product license using a product ID and optional seller account; read-only, with no OAuth required.

Instructions

Verify license. Reviewed native POST /licenses/verify; scope: No OAuth required. Read only; no local effect approval required.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
accountNoExact private profile label; never inherited credentials, ownership or scope proof.
product_idYesCurrent native product ID, never deprecated permalink.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.0.0

TDQS

B3/5.0
Behavior4/5

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

Annotations already establish readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint. The description adds genuinely new context beyond that: 'No OAuth required' discloses auth requirements, and 'no local effect approval required' discloses that no approval gate applies. It does not, however, explain the verification outcome or error behavior, and 'Read only' merely restates the annotation.

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

Conciseness3/5

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

It is short, but the first two words are pure title restatement and the remaining text is a telegraphic list of endpoint and policy fragments rather than front-loaded prose. There is little waste, but the structure is cryptic rather than efficient.

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?

This is a simple, idempotent, read-only lookup with a fully documented 2-parameter schema and complete annotations, so the bar is relatively low. Still, with no output schema, the description never indicates what verification returns (a boolean, a status, failure modes) or how a failed verification is surfaced, leaving an agent to guess.

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%, so the schema already documents both parameters (including the 'never inherited credentials' note on account and the 'never deprecated permalink' note on product_id). The description adds nothing about parameters, so the baseline 3 applies.

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 opening sentence 'Verify license' simply restates the tool title and name, which by itself would be tautological. The follow-up adds some specificity by naming the underlying endpoint (POST /licenses/verify), but it never says what 'verify' means operationally (validity check? signature check?) or how it differs from siblings like enable_license, disable_license, or rotate_license.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternatives. The clauses 'Read only; no local effect approval required' describe behavior, not the conditions under which an agent should pick this tool over its many license-related siblings.

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