chess_player_stats

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

With no annotations provided, the description carries the full burden of behavioral disclosure, but it merely states the action. It does not describe what specific statistics are returned, any authentication requirements, rate limits, or data freshness.

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 very concise with a single sentence, but it is too minimal for an agent to use effectively. While it is front-loaded, it lacks structure and additional contextual sentences that would be expected for a 1-parameter 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?

Given the tool's simplicity (one parameter, no output schema, no annotations), the description is not complete enough. It fails to explain what the output contains or any nuances about the player username, leaving the agent underinformed.

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 input schema has a single parameter 'username' with no description (0% coverage), and the tool description adds no additional meaning. An agent has no information about valid username formats, case sensitivity, or whether it is the Chess.com username.

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 clearly states the verb 'Get' and the resource 'Chess.com player statistics,' which conveys the tool's basic purpose. It is distinguishable from sibling tools like chess_leaderboards and chess_player_games, as 'statistics' implies a broader data set than a simple profile or games list.

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 indication is given about when to use this tool versus alternatives such as chess_player or chess_player_games. The one-line description lacks any guidance on context or exclusions.

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