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

Annotations already declare readOnly, idempotent, non-destructive, openWorld. The description adds genuinely new behavior: metered usage tied to the connected account, one bounded request with no polling/retry, and no guarantee of returns. This exceeds what annotations convey.

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?

Purpose is front-loaded, but the remainder reads as a concatenated boilerplate policy block ('Read-only Product data or price calculation...') with some redundancy and no clear structure. It is not excessive in length but several clauses do not earn their place for this specific tool.

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?

An output schema exists so return values need not be explained, and annotations cover the safety profile. The gap is that a nested-schema, 2-parameter tool with 0% schema coverage leaves parameter usage entirely undocumented, which is not compensated in the description.

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 reported at 0%, so the description should compensate, yet it says nothing about teamID, year, stats_ids, player_ids, or season_type semantics. The only nod is 'Use returned canonical IDs', which does not explain any parameter's format or constraints.

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 opens with a specific verb+resource (get player season stats for a team), which is distinct from v2GetTeamStats and v2GetPlayerStatsByEvent. However it does not explicitly name or contrast those siblings, so an agent must infer the boundary from the scope wording alone.

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?

It gives operational directives ('Use returned canonical IDs', 'never infer coverage from an empty result') and notes Affiliate 27 is excluded, which is useful context. But there is no explicit when-to-use vs alternatives guidance relative to the many sibling stat tools (v2GetPlayerStatsByEvent, v2GetTeamStats).

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