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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that: the link is permanent and exists from product creation, and the GS1 Digital Link is conditional on the product having a GTIN — a meaningful behavioral condition. It stops short of covering failure modes (e.g., unknown product_id) or authentication requirements.

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

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

It is a single dense sentence with the core answer front-loaded ('Returns the permanent QR link'), followed by the component breakdown. The nested parenthetical about /q/<code> permanence is slightly heavy but each clause carries distinct information, so little is wasted.

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

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

With no output schema, the description carries the burden of explaining return values, and it does so thoroughly by naming all four returned artifacts. Annotations cover safety and idempotency. The only gap is behavior on an invalid or foreign product_id, which an agent would need to know before calling.

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

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

Schema coverage is 100%, so both product_id and language are fully documented in the schema, and the baseline of 3 applies. The description reinforces that the target is a specific product but adds no syntax, format, or default details beyond what the schema already states, and never mentions the language parameter or its output-language effect.

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

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

The description opens with a specific verb and resource — 'Returns the permanent QR link of a product' — and immediately enumerates what that entails (/q/<code> URL, GS1 Digital Link, PNG/SVG image addresses, print sheet). This is clearly distinct from data-retrieval siblings like get_my_product or list_my_products, which return product data rather than QR artifacts.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied: an agent can infer this is the tool to call when it needs a product's QR code or GS1 Digital Link. There is no explicit 'use this when' statement, no note on prerequisites (the product must already exist in the connected account), and no comparison to any alternative tool for obtaining product links.

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