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

Annotations already establish readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds context annotations cannot express: results are truncated to the last four characters and keys are never readable, which tells the agent exactly what will and will not come back. It stops short of describing ordering or a return structure, so a 4 rather than a 5.

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?

It is a single dense sentence whose colon cleanly separates the two scope branches from the shape of the returned data. Every clause carries information; the only minor cost is that the opening noun phrase reads slightly awkwardly compared to a verb-led opening.

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 one optional parameter, no output schema, and annotations covering safety and openness, the description supplies the missing pieces: what identifies each key, how recency is reported, and that raw key material is withheld. Nothing an agent needs in order to call it correctly appears to be absent.

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 coverage is 100%, so the baseline is 3, but the description earns more by explaining the semantic effect of the optional game parameter: supplying it returns a game's publishable keys rather than the caller's server API keys. That is a consequence the schema text ('id or slug') does not convey.

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 precisely: the link owner's server API keys, or a game's publishable keys, returned as last-four-characters plus last-used timestamps. That is specific enough to distinguish it from write-oriented siblings like my_badge_webhooks or list tools like my_badge_games. It falls short of a 5 only because it is phrased as a noun phrase with no explicit verb (list/retrieve) and never names a sibling directly.

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?

The phrase 'when a game is given' implicitly tells the agent the game parameter switches scope, which is useful implied guidance. However, there is no explicit statement of when to call this versus my_badge_games, my_wallets, or other my_* tools, and no stated prerequisites such as authentication as link owner.

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