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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuine context beyond that: exactly which sections come back, that the field is only populated for the current week (DP World Tour or a major), the Thursday tee-time cutoff, and the scoring model (one pro per tier, captain at ×1.5, Stableford-over-par plus cut and finish bonuses). It does not describe pagination or size, but for a zero-param read that is minor.

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?

Content is front-loaded with the domain and the tournament, which is good, but it is delivered as one long run-on Spanish sentence with nested parentheticals that is harder to scan than it needs to be. The trailing rules sentence is useful for interpreting points but sits at the same level of prominence as the core return contract.

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?

There is no output schema, so the description carries the burden of describing the return payload, and it does so field by field (tournament, open/closed picks, six tiers with pro attributes, own team). Combined with the scoring rules an agent needs to explain results, the definition is functionally complete; only the return shape (ordering, nulls when no team exists) is left implicit.

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 no parameters, so there is nothing for the description to disambiguate — the baseline of 4 applies. The description instead spends its space defining the semantics of the returned fields (tier, world_rank, estado, posición, puntos), which is the right allocation for a zero-arg getter.

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: it returns the week's fantasy tournament, pick-open status, the six tiers with each pro (status, position, points), and the caller's own team. It also disambiguates 'world_rank' as the Badgie ranking rather than the official one, which prevents a real misreading. It does not name the sibling tools (get_fantasy_season, get_fantasy_standings, suggest_fantasy_squad) it must be distinguished from, so it stops short of a 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?

Usage is implied rather than stated: the mention that picks close at the first tee time on Thursday tells the agent this is the place to check whether entry is still possible. There is no explicit when-to-use/when-not-to-use guidance and no pointer to the standings, season, or squad-suggestion siblings, leaving the agent to infer which fantasy tool answers which question.

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