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@yawlabs/lemonsqueezy-mcp

by YawLabs

ls_validate_license

Read-onlyIdempotent

Validate a license key or specific instance activation using the license key for authentication, no API key required.

Instructions

Validate a license key or specific instance. Does not require an API key — uses the license key itself for auth.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
licenseKeyYesThe license key to validate
instanceIdNoOptional instance ID to validate a specific activation
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, etc. The description adds that no API key is needed, which is behavioral context not in annotations. It could mention that validation has no side effects, but the addition is still valuable.

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, front-loaded sentence with no unnecessary words. Every part conveys essential information efficiently.

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?

With no output schema, the description should hint at the return value (e.g., boolean, status). It does not, leaving agents uncertain about the response format. Also, it could better differentiate from ls_get_license_key.

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%, with clear descriptions for both parameters. The description adds no extra parameter semantics beyond what the schema provides, so baseline 3 is appropriate.

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?

The description clearly states the verb 'Validate' and the resource 'license key or specific instance', making the tool's purpose apparent. It distinguishes from siblings like ls_activate_license and ls_get_license_key, but could be more explicit about what validation entails.

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 notes that no API key is required, which guides when to use this tool versus others that need authentication. However, it does not provide explicit when-not-to-use guidance or list alternatives among siblings.

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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