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

Annotations already declare the safety profile (readOnly=false, destructive=false, idempotent=false, openWorld=false), so the safety burden is lifted. However, the description adds nothing beyond that: it never says whether score submission is idempotent (annotations say it is not, implying re-submits may duplicate), what player identity is required, or what happens on unlock vs submit. The 'non-idempotent mutation' implication is left silent.

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 single sentence is front-loaded and waste-free, and the three verb phrases map onto action values cleanly. But for a seven-action dispatcher with a free-form nested parameter, one sentence is under-sized rather than appropriately concise, leaving the bulk of the surface unexplained.

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?

The tool is genuinely complex: seven dispatch actions plus an untyped nested params object, and there is no output schema to fall back on. The description documents fewer than half the actions and none of the parameter shapes, so an agent cannot construct a correct call for the undocumented actions.

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%, so the description must carry the parameter burden and it does not. It hints at three of the seven action values but never explains the free-form nested 'params' object, whose accepted keys presumably differ per action; an agent has no way to know what to put in it.

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 gives concrete verbs and resources (submit scores, unlock achievements, view leaderboards), which is more than a tautology. But it is a multiplexed tool with seven enum actions, and four of them (rankings, register_game, get_game, get_player) are never mentioned, so an agent cannot tell from the text alone what the tool's full scope is.

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?

There is no when-to-use guidance at all: no explanation of when to pick one action over another, no note that register_game must precede submit, no mention of alternatives among the arcade/socnet/core siblings. The agent must infer usage entirely from the enum values.

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