game_center_achievement_images_v2_create_instance

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

No annotations are provided, so the description carries the full burden, yet it discloses nothing about authentication requirements, side effects, or what the create operation affects. It only signals (via the duplicated 'POST') that this is a mutation, which the name already conveys.

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 short and front-loads the endpoint, but the parenthetical immediately repeats the identical path verbatim, which is pure redundancy, and the second sentence only redirects the reader elsewhere rather than delivering information.

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 create tool with a nested JSON:API body, no annotations, and no output schema, the description leaves the agent without required-field, envelope, or response information. Referring to an external 'components.schemas' name that the agent cannot resolve is not actionable.

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 100% and there is a single 'body' parameter, so the schema already documents it; baseline 3 applies. The description's pointer to components.schemas.GameCenterAchievementImageV2CreateRequest is marginally useful orientation but does not add field-level meaning beyond the schema.

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 restates the endpoint as 'POST /v2/gameCenterAchievementImages', which is essentially the name (create_instance) re-encoded as an HTTP verb plus path. It adds no semantic meaning about what a Game Center achievement image is, and it does not distinguish this v2 tool from the sibling game_center_achievement_images_create_instance (v1). It is a tautology of the tool name.

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 guidance on when to use this tool, no prerequisites, and no mention of the v1/v2 alternative or the get/update/delete siblings. An agent must infer everything from the name alone.

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