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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered; the description adds content-level behavior by specifying that results bundle plays and a Luck Point breakdown split by source. It stops short of noting pagination, ordering, or what an empty result looks like, so it is strong but not exhaustive.

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 with no filler: the first defines the resource and its contents, the second routes the agent via sibling tools. The payload definition is front-loaded ahead of the routing advice.

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?

With no output schema and no parameters, the description is the only source of return information, and it does cover the essentials (games, plays, Luck Points by source). It leaves scope details such as result limits, time window, or ordering unspecified, which is a minor but real gap for a list-style read tool.

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 no parameter semantics for the description to carry and the schema is trivially complete. Baseline 4 applies; no description text is needed or wasted here.

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?

States the resource precisely ('the games you created') plus the payload it aggregates ('people's plays and the Luck Points you earned'), including the split between player-earned and house-bot-earned points. It also names the two sibling tools it is not (game_status, list_games), so an agent can distinguish it without opening any schema.

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?

Gives an explicit when ('Use it to see how your games are doing') and two named alternatives with selecting conditions: game_status for a board still certifying, list_games for browsing everyone's games. Nothing about tool choice is left to inference.

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