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

Annotations already declare readOnly/idempotent/non-destructive, so the description carries a lighter burden. It usefully discloses the returned content (availability + official URL) in the absence of an output schema, but says nothing about what happens for unpublished events or events without ticket sales.

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?

One compact sentence that front-loads the action and the returned values with no filler. Brevity is appropriate here, though a short clause on failure/precondition would have earned more.

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 single-parameter, read-only lookup with no output schema, the description covers what the tool returns and the published-event constraint. Only edge-case behavior (no tickets, unpublished event) is missing.

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 'event' parameter already documents that it accepts a numeric ID or slug. The description adds no further semantics about the identifier beyond the 'published event' constraint.

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?

Specific verb+resource: 'Consulta la disponibilidad y URL oficial de entradas de un evento VITUR'. No sibling tool (informacion-evento, agenda-evento, etc.) covers ticketing, so the resource is implicitly distinct, though it doesn't explicitly contrast with the closest siblings.

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 resource (fetch ticket availability/URL for an event), and the word 'publicado' hints at a precondition, but there are no explicit when-to-use/when-not rules or named alternatives among the many sibling endpoints.

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