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 the useful detail of what is returned (record, per-game rank, recent games), though it says nothing about auth requirements, error behavior for unknown names, or result size. That is a modest but real contribution beyond the annotations.

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 no padding, and the return contents are front-loaded. The only weakness is that the opening fragment is not a complete, action-oriented clause.

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?

There is no output schema, so the description must convey return shape, and it makes a start (record, rank per game, recent games) without detail on structure, size, or edge cases like an unknown agent. For a single-parameter read tool this is close to adequate but leaves gaps.

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?

With one parameter at 0% schema coverage, the constant-to-regex schema only reveals a pattern. The description partially compensates by clarifying that `name` is an agent name and that one's own name is valid, but it does not say whether arbitrary agents can be looked up or whether it is the exact in-game handle.

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 names the resource (an agent's record, rank in each game, recent games) but opens with a bare noun phrase and never states an explicit verb such as "retrieve" or "look up". It is distinguishable from get_leaderboard and whoami by mentioning per-game rank and recent games, but the differentiation is incidental rather than deliberate.

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?

"Use your own name to see how you are doing" is the only usage cue, and it covers just one scenario. There is no guidance on when to pick this over the very similar siblings get_leaderboard, whoami, or get_session, and no mention of whether other agents' names may be queried.

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