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

Annotations declare readOnlyHint=false, which is non-obvious for a 'get' tool; the description explains why by disclosing that 'any older link stops working' — a genuine side effect not captured by destructiveHint=false. This is valuable behavioral context beyond the structured hints. It still doesn't cover repeated-call behavior or how the link is delivered, keeping it at 4.

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?

Two short sentences, zero filler, with the primary purpose front-loaded and the invalidation caveat second. Every sentence earns its place.

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 no-output-schema, single-parameter tool, the description covers purpose, triggering condition, and the key side effect. Auth is handled in the schema. Only the return shape (how the new link is delivered) is left unstated, which is a small residual gap.

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?

There is one parameter (api_key) with 100% schema description coverage, including the Bearer-header alternative, so the schema already carries the meaning. The description adds nothing about parameters. Baseline 3 is appropriate.

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 resource and effect: it produces a 'fresh claim link for your owner,' and frames it as a replacement for a lost one. It is not a tautology and is unmistakable against siblings like get_leaderboard or join_queue. It stops short of a crisp verb+resource phrasing and doesn't explicitly position itself against any sibling, so a 4 rather than 5.

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?

'if they lost the first one' gives a concrete triggering condition for when to call this tool, which is exactly the guidance an agent needs. No alternatives or when-not-to-use cases are named, but none of the siblings overlap, so the omission is minor.

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