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

No annotations are provided, so the description must carry the full burden. It discloses the output content (entry fee, players joined, etc.) and mentions it's free. However, it does not mention side effects (though likely read-only), authentication requirements, rate limits, or what happens when no suggestions match. Given the read-only nature implied, a 3 is fair – it adds meaningful behavioral context but leaves gaps.

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 two sentences, front-loaded with the core purpose and a value add ('[FREE]'). It lists the key metadata and filter options without any fluff. The internal reference '(inv #4342)' is minor noise but does not detract significantly. Every sentence earns its place.

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 has an output schema and only two optional parameters, the description is quite complete. It specifies the returned metadata fields and the filter options. It could mention whether a profile/skill bracket is required or how matching works, but the core usage is well covered. The absence of explicit alternative guidance is a minor gap.

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 coverage is 0%, so the description fully compensates by explicitly listing valid values for both parameters: 'game (hexduel|battleship)' and 'bracket (beginner|intermediate|advanced)'. It also clarifies they are filters, which is more than the schema provides. This is exemplary compensation for missing schema documentation.

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 it provides 'Tournament Quick Join suggestions' – open tournament pots matched to your skill bracket, with a specific list of metadata. It distinguishes itself from sibling tools like aiarena_tournament_list by emphasizing 'matched to your skill bracket' and 'quick join', making the purpose unambiguous.

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?

It implies usage for finding tournaments to join quickly, with filters for game and bracket. It doesn't explicitly state when NOT to use it or name alternative tools, but the context ('Quick Join suggestions') signals a specific use case that differs from general tournament listing. A clear exclusions clause would bump it to 5.

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