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

Annotations already declare readOnly, idempotent, and closed-world, so the safety profile is covered. The description adds genuinely useful behavior beyond that: the default round falls back to the latest round with results, and the final round of a finished season produces the definitive table with champion and margin. It does not describe ordering or response size, which keeps 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 tight sentences with zero filler; the core resource and the default-round behavior are front-loaded. The final-round clarification is earned because it changes how an agent should interpret the output.

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 two-parameter read-only tool with no output schema, the description does the important work: it establishes scope, the default round, the per-driver points payload, and the final-round edge case. What is missing is minor — ordering of the standings and whether the points shown are cumulative totals or round-only scores is only loosely implied.

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%, so the schema already documents both season and round with ranges and examples. The description adds only a small nuance by specifying 'the latest round with results' rather than merely 'the latest', and says nothing about how round interacts with an in-progress versus finished season beyond the final-round case. 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 names a specific resource and scope: drivers' championship standings for a season at a given round, including per-round points. That is concrete enough for an agent to know exactly what data comes back. It stops short of naming sibling tools (championship_math, power_ranking) to explain how it differs from them, so it lands at 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?

Usage is implied rather than stated: omitting round yields the latest round with results, and querying the final round of a finished season yields the final table. There is no explicit 'use this instead of X when Y' guidance, and no mention of when this is the wrong tool versus championship_math or power_ranking. Adequate but leaves routing to inference.

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