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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false, and destructiveHint=false, so the safety profile is fully covered. The description adds no behavioral context such as what data is returned, whether it includes breakdowns or history, or any caching/rate-limit traits, leaving the description essentially empty on behavior.

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 description is a single sentence and not bloated, but the parenthetical 'for the card's own view' is unclear and fails to earn its place. It is concise but under-informative rather than front-loaded with useful detail.

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 one-parameter tool with rich annotations and no output schema, the description should at least explain what 'player card data' or 'breakdown' contains and how it differs from get_player. It omits these, leaving the agent unable to confidently choose this tool over siblings.

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% for the single player_id parameter, so the schema already documents its type, range, and meaning. The description adds no parameter semantics beyond what the schema provides, making the baseline 3 appropriate for a high-coverage one-parameter 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 restates the title and name ('player card's data for one player') without a clear verb or scope details. It does not distinguish this tool from the sibling get_player or find_players, and the phrase 'for the card's own view' is internal jargon that adds confusion rather than clarity.

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 provides no guidance on when to use this tool versus alternatives like get_player, compare_players, or find_players. The only hint—'for the card's own view'—is not an actionable usage condition for an agent.

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