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

Annotations already establish readOnlyHint=true and openWorldHint=false. The description adds useful behavioral context beyond that: the link opens on tangylimes.com, is intended for a recipient to add their photo and see a free preview, and can automatically apply a discount code.

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?

The description is two short sentences with no wasted text. It front-loads the resulting link experience and then adds the relevant discount-code behavior.

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?

For a simple read-only link-generation tool, the description covers the domain, recipient flow, and discount-code behavior. It still leaves the required card_id semantics and the exact return value somewhat implicit, which is a noticeable gap given there is no output schema.

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 50%: the optional code parameter is described in the schema and the description adds that it applies automatically. However, the required card_id parameter has no schema description and the description only indirectly implies it identifies the card being linked to.

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 clearly indicates the tool produces a link that opens a specific card on tangylimes.com, so the resource and outcome are understandable. It does not explicitly name the action verb 'generate/create' or differentiate the tool from siblings like get_card, but the core purpose is still clear.

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?

The description implies when this tool is useful: when someone should receive a link to add their photo and watch the free preview, optionally with a discount code. It does not explicitly state when to use this instead of alternatives such as get_card or buy_cards, so guidance is inferred rather than explicit.

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