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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely new disclosure beyond that: account-dependent access, delay and metered usage, a no-retry/no-polling constraint, and an explicit affiliate exclusion (27). What it omits is any statement about result shape or scoping by sport, but the output schema covers returns.

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?

The purpose is front-loaded correctly, but the body is a run-on string of concatenated clauses with no sentence structure. Several clauses ("No wagers, account changes or guarantee of returns") read as generic boilerplate applicable to every tool in this server rather than earning their place here, diluting the tool-specific content.

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 zero-parameter read tool with an output schema, the description covers the remaining agent-relevant dimensions: read-only nature, connectivity/rate-limit behavior, retry expectations, and an affiliate exclusion. The gap is sibling disambiguation (v1 vs v2 season-type endpoints) and any hint of what a "season type" denotes, which would help the agent confirm the right endpoint.

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 zero parameters, so the baseline of 4 applies; there is no argument whose semantics could be clarified. The line "Use returned canonical IDs" is output-chaining advice rather than parameter documentation, and it is not accompanied by a parameter it applies to.

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 opening clause gives a specific verb and resource ("List season types per sport"), matching the title and telling the agent exactly what is enumerated. It does not, however, distinguish itself from close siblings such as v2GetSeasonTypes or v1GetDivisionsBySport/v1GetConferencesBySport, so an agent cannot tell from the description alone which of these to pick.

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?

The description gives operational usage context (one bounded request, no background polling or automatic retry, do not infer coverage from an empty result) which steers invocation behavior. It never addresses when to use this tool versus a sibling like v2GetSeasonTypes, nor any prerequisite for acquiring a sport identifier, so selection guidance is only implied.

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