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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the current-plus-historical data scope and the periodId handoff, which is useful context, but does not disclose anything further about limits, coverage, or behavior beyond the structured fields.

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?

A single efficient sentence that front-loads the purpose and appends the one actionable instruction. No filler or redundancy.

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 not be explained, and for a one-parameter read tool the description covers purpose, the parameter's meaning, and the downstream integration. Nothing critical is missing, though there is no detail on how many periods are returned or their ordering.

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 gender parameter is fully documented in the schema, including the two valid choices. The description only repeats 'men or women', adding no syntax or format meaning beyond the schema, so the baseline 3 applies.

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 (List) and resource (FotMob's current and historical FIFA ranking periods), with the scope qualification 'for men or women'. It also implicitly distinguishes itself from the sibling fotmob_fifa_rankings by being the source of periodIds rather than the rankings themselves.

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?

Explicitly tells the agent to use a returned periodId with fotmob_fifa_rankings, establishing a clear discovery-then-fetch pipeline. It lacks an explicit 'when not to use' or a named alternative, so it falls just short of the top band.

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