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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so safety is covered. The description adds genuinely useful behavioral context: the tracking window start date (Sep 27 2026) for the 'since tracking began' high, the exact high windows (24h, 14d, all-time), and that update entries include post-update player movement. It omits any note on cost, latency, or response size for this large aggregate.

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?

Everything stated earns its place as return-content disclosure for a tool with no output schema, and the key framing is front-loaded. However, it is delivered as one ~90-word run-on sentence with no sentence breaks or grouping, making the long return list harder to scan than it needs to be.

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 rich single-game aggregate with no output schema and one 100%-documented parameter, the description does the heavy lifting by enumerating essentially every returned section plus the spark_7d series. Missing only edge details such as behavior for an invalid/unresolvable game reference or the response's size/shape.

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?

There is only one parameter and schema description coverage is 100%, so the schema already explains that 'game' accepts a name, universe id, Roblox link, place id, or roterminal.co/g/ link. The description adds nothing about the parameter, so the baseline 3 for fully-covered schemas applies.

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 states precisely what the tool returns for a single Roblox game — live players, 1h/24h change, highs, momentum, 7-day average, genre, developer, updates, rivals, chart placements — which is far more specific than the bare name 'game' or title 'A game now'. The closing line 'Start here for any question about one game' implicitly separates it from multi-game siblings like compare, though it never names them.

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?

'Start here for any question about one game' is an explicit when-to-use instruction that gives the agent a clear routing rule for this aggregate dashboard tool. It stops short of naming alternatives or stating when-not to use it (e.g., when you need multiple games or historical-only data, use compare/trends).

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