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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false, and openWorldHint=false. The description adds real value beyond that by naming the required auth scope (`favoritos:write`), which the annotations do not carry. It stops short of describing failure/error behavior for a non-favorited id, so a 3 reflects partial added context.

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, front-loaded with the action and followed by the required precondition. Nothing is wasted and there is no boilerplate.

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 an output schema present, return values need no explanation, and the auth scope plus destructive/idempotent annotations cover the behavioral essentials. A minor gap remains around error cases (e.g., id not in favorites), but nothing blocking correct invocation.

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 description coverage is 100% and the single `id` parameter is fully documented with format and pattern in the schema. The description adds no format or semantic detail beyond what the schema provides, so the 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?

States a specific verb+resource: 'Quita una subasta de tus favoritos', which is unambiguous and easily separated from favoritos_anadir and favoritos_listar. It omits any explicit sibling reference, but the action itself is precise enough to route correctly.

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 implied by the name and the removal verb, and it discloses the precondition of an authenticated account with the `favoritos:write` scope. However, it never states when to prefer this over alternatives or what happens if the auction isn't currently favorited.

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