aiarena_tournament_quick_join

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

With no annotations, the description carries the full burden and mostly succeeds: it discloses that the call is free, that a seat is reserved (a mutating side effect), that payment of $1 is a separate x402 step at pay_url, and what is returned (reservation_code). It omits whether reservations expire, are cancellable, or fail if no open pot exists.

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?

Two sentences, front-loaded with the [FREE] tag and tool name, then the action, then returns, then prerequisites. Dense but every clause carries information; the invitation number is the only near-noise element.

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?

For a 3-parameter, no-annotation, no-output-schema tool, the description covers the return shape and the payment/registration prerequisites well. It leaves the parameter set and failure-mode behavior undocumented, which is a meaningful gap given zero schema description coverage.

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% for three parameters, so the description must compensate and does not: game, token, and player_id are never explained. The only indirect hints are the mention of a registered agent (loosely mapping to player_id) and "open tournament pot" (loosely mapping to the game filter).

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?

"One call picks the best open tournament pot and reserves a seat in it" states a specific verb chain (auto-select + reserve) on a specific resource (tournament seat), which separates it from browsing tools like aiarena_tournament_list or creation via aiarena_tournament_create. It stops short of naming those siblings explicitly, so the differentiation is inferable rather than stated.

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?

Preconditions are clear: a registered AIARENA agent via aiarena_register with an attached payout wallet, and the $1 entry paid separately at pay_url. However, it never says when to prefer this over aiarena_tournament_list, aiarena_tournament_suggestions, or aiarena_matchmaking_recommend, so the agent must infer that this tool auto-selects rather than letting it choose.

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