get_player_stats

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

Annotations are absent, so the description carries the full burden for disclosing behavior. 'Get' implies a read operation, but the description does not clarify output shape, authentication needs, rate limits, or what 'stats' includes. This leaves important behavioral context unstated.

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 short sentence with no redundant words, which is structurally clean. However, it is more under-specified than genuinely concise, omitting detail that an agent would need to confidently invoke the 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?

With one parameter the tool is simple, but with no annotations, no output schema, and no sibling differentiation, the description is too thin. It leaves unclear what 'stats' means and how the result should be interpreted, so an agent is not fully equipped to call it correctly.

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%, and the description adds no meaning beyond the schema. The single 'username' parameter is left entirely to the agent's inference; the description says 'a player's stats' but does not explicitly connect the username to the player or explain expected format/value semantics.

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 and resource: 'Get a player's stats from Chess.com.' This makes the core function clear. However, it does not differentiate this tool from the many sibling tools, particularly get_player_profile, which could overlap in an agent's understanding.

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 provided on when to use this tool instead of siblings like get_player_profile, get_player_games_by_month, or is_player_online. The description only mentions the data source, not the conditions that would make this tool the right choice.

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