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

Annotations only declare non-read-only, non-idempotent, non-destructive; the description adds the key facts those hints cannot convey: the key is shown exactly once, retries are rate-limited/refused, storage is platform-specific (Roblox server-side only), and the reason string is persisted on the key. It does not describe the response shape beyond the storage note, so it stops short of 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?

Purpose is front-loaded in the first sentence, followed by precondition, result/security, and retry behavior in a logical order. Every sentence carries information, though the security admonition about not printing the key is agent-policy guidance rather than a property of the tool itself.

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, the description must carry the return contract, and it does partially by saying the result indicates where the key must be stored. Combined with the one-time-visibility and retry-refusal notes, an agent has enough to call this safely, though the actual response fields are not described.

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; the description still adds value by explaining that `reason` is recorded on the key (which is why it must justify the need) rather than being a throwaway note. `label`, `projectId`, and `environment` are left entirely to the schema, which already handles them well.

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 a specific verb and resource ('Create a Gamebeast SDK key') plus an immediate gloss of what the resource is ('a public key for the game client or server SDK'), scoped to project and environment, and notes the one-time return. No sibling tool overlaps, and an agent can tell exactly what this produces.

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 precondition with concrete search targets (.env files, secret/config modules, an existing Gamebeast:Setup / GamebeastSdk.Setup call) and says to call only when none is found. It also warns that a second call within a few minutes is refused, which is real when-to-call guidance an agent would otherwise trip over.

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