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

The description successfully adds crucial behavioral context by stating the cost ('Costs 5 credits'). This information is critical for agent planning but is not available in the annotations.

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 tool uses a single, dense sentence to communicate an extremely high volume of functional information efficiently without waste.

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?

By listing nearly every piece of data included in the overview, the description leaves no ambiguity about the scope of the information returned, making it maximally complete for an agent.

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?

Since schema description coverage is 100%, the schema already documents the parameters. The description provides no additional meaning or context for the 'player_id' or 'league' parameters.

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 provides an extremely detailed breakdown of the resource, listing specific data points like 'profile,' 'career totals,' 'our current rating,' and 'last ten results,' making its function perfectly clear.

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 implies usage by detailing the type of data retrieved (a comprehensive overview), but it fails to specify when to choose this tool over similar siblings like 'get_player_stats' or 'get_player_results' in a workflow.

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