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

Annotations already declare readOnly/idempotent/non-destructive, so safety is covered. The description usefully adds the 30-minute refresh cadence and the DraftKings scoring basis, which are genuine behavioral traits, but says nothing about pagination, plan limits, or return shape beyond the field list.

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 in the first clause, followed by a concrete field list (justified since there is no output schema) and two short metadata sentences. The single long enumeration is dense but each element carries information.

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 no output schema, the description appropriately carries the return-value burden by naming every field, and it adds freshness and scoring context. However, it omits usage context and meaningful parameter guidance, leaving the filtering story thin for a 3-param tool.

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 coverage is 67%, and the description adds essentially no parameter meaning: team and limit are never addressed, and status only appears incidentally as an output field rather than as a filter. It fails to compensate for the coverage gap.

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 (NHL starting goalies for today) and enumerates the exact fields returned, so the agent knows precisely what data comes back. It does not differentiate itself from nearby siblings like invoke_nhl_projections or invoke_nhl_player_pool, but the resource itself is distinctive.

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?

There is no when-to-use guidance, no mention of prerequisites, and no routing to alternatives such as invoke_nhl_projections or invoke_nhl_player_pool. The 'for today' scope is implied but the agent gets nothing about when this is the right call versus siblings.

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