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 that it returns markets and selections for a category, but does not disclose pagination, rate limits, or how the open-world data freshness works, leaving gaps a betting-data tool should fill.

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 compact sentence that front-loads the entity and scope. It is efficient, though the parenthetical category examples could have been used to clarify the subcategory_id parameter instead of just illustrating breadth.

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-value explanation is not required. However, with 0% schema description coverage and no usage guidance, the description leaves the agent under-informed about what values to supply for event_id and subcategory_id and when this tool is the right choice.

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 0%, so the description must compensate. It introduces the concept of a market category (game lines, player props, alternate lines) mapping loosely to subcategory_id, but neither event_id nor subcategory_id gets a clear definition, format, or example. Coverage is inadequate for a 0%-documented 2-param tool.

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 states a specific verb+resource: retrieving DraftKings Sportsbook event markets/selections filtered by market category. It is differentiable from sibling tools like draftkings_event, draftkings_odds, and draftkings_live, though it doesn't explicitly name how it differs from them.

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?

No guidance is given on when to use this tool versus alternatives such as draftkings_odds or draftkings_event. The description implies a scoped-fetch use case but offers no explicit when/when-not conditions or alternative routing.

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