compare_players

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

Without annotations, the description carries the full behavioral disclosure burden, but it only rephrases the operation. It does not clarify that the tool is read-only, how it resolves player names, whether it calls external FPL data, or whether it returns live vs cached information.

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 with no repeated terms, filler, or unnecessary clauses. It communicates the core purpose efficiently, though its brevity also contributes to missing contextual details.

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 that the tool has only one parameter and an output schema exists, the description is close to adequate for a comparison utility. Still, with no annotations, it would benefit from noting how player names are matched and what exactly is compared, which are not addressed.

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 provides no descriptions and coverage is 0%, so the description's mentions of 'two or more' and 'by name' add meaningful constraints for the sole 'players' parameter. However, it does not specify exact name formats, matching rules, or the expected array length beyond 'two or more'.

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 uses a specific verb ('compare') with a clear resource ('players') and qualifies the comparison as 'side by side by name'. This helps differentiate it from singular lookup tools like get_player, though it does not explicitly name sibling alternatives.

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 explicit when-to-use or when-not-to-use guidance. The 'two or more players' phrase implies a minimum input size, but it does not tell an agent when to choose this tool over search_players, get_player, or other comparison-adjacent tools.

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