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

With no annotations, the description must carry behavioral disclosure. It usefully explains that staked/prize games are closed for regulatory reasons, which prevents an agent from attempting them, but it does not describe what 'status' means, whether tools listed are callable names, or what the response shape looks like.

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 short sentences with the catalog purpose stated first and the regulatory constraint second; no wasted wording. The phrasing 'Every game here' is slightly ambiguous about what 'here' refers to, but the structure is front-loaded and efficient.

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 zero-parameter, no-output-schema index tool, the description covers purpose and the closed/free distinction, but leaves the return shape vague: it does not clarify that it returns game names, statuses, and the corresponding tool identifiers, nor what status values exist. Minor but real gaps given there is no output schema to fall back on.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the schema is complete by definition. The baseline for a no-parameter tool applies; the description correctly adds no parameter guidance because none is needed.

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 says it lists 'Every game here and its status, with the tool for each,' which conveys a catalog/index of games plus their associated tools. However, the verb is implicit ('index') and it never names or distinguishes itself from nearby siblings such as onchain_games or the various game-state tools (graviton_state, wall_grid), so an agent must infer the distinction.

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?

'Everything with a stake or a paid prize is CLOSED ... what remains is free to play' gives useful selection context: use this to find free-to-play games and to learn which titles are unavailable. It does not state when to prefer this over onchain_games or the per-game tools, so the guidance is implied rather than explicit.

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