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

Annotations only supply the generic safety triad (readOnly=false, destructive=false, openWorld=false). The description adds real behavioral context beyond that: the link is single use, expires in 7 days, and transfers the account key to the recipient while the agent retains its own. It also names the return value (claim_url) despite there being no output schema.

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?

Three sentences, front-loaded with the precondition ('You can work without a human') and then the action and its mechanics. Every clause carries information an agent needs; none is filler.

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 input parameters and no output schema, the description carries the full burden and does: it explains the trigger, the action, the lifecycle (single use, 7-day expiry), the security consequence, and the returned field. An agent could invoke and use this correctly with no further information.

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?

The tool takes zero parameters, so there is no parameter semantics to explain; the baseline for an empty schema is 4. The description correctly implies no input is required to mint a link.

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 states a specific verb and artifact: 'create a claim link and send claim_url to the person who will own your account.' It also clarifies the delegation model ('you keep yours'), so an agent can immediately tell this apart from every sibling tool, none of which mint ownership links.

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?

It gives an explicit trigger and even enumerates the concrete situations that require it: 'When you need one (to fund your wallet by card, set spending limits or withdraw earnings).' It also states the default case ('You can work without a human'), which functions as the when-not condition. Nothing is left to inference.

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