game_center_activity_images_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 behavioral burden. The 'POST' verb implicitly signals a write/create operation, but the description never states auth requirements, that a new resource is created, side effects, validation rules, or error behavior. Pointing at the OpenAPI schema is a structural pointer, not behavioral disclosure.

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?

The description is short but wastes its opening by duplicating the identical endpoint string in parentheses. It is front-loaded with the URL, but the redundant repetition and lack of substantive content make the brevity a symptom of under-specification rather than efficient conciseness.

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-instance tool with a nested JSON:API body, no output schema, and no annotations, the description is far too thin. It does point the agent to the request schema, which marginally helps call construction, but it omits any explanation of the resource being created, prerequisites, or expected behavior.

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 a single 'body' parameter and schema description coverage is 100%, so the schema already documents the parameter. The description's reference to components.schemas.GameCenterActivityImageCreateRequest merely echoes the schema's own description and adds no new meaning. Baseline 3 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 is essentially the endpoint restated twice: 'POST /v1/gameCenterActivityImages (POST /v1/gameCenterActivityImages)'. It never says in plain language that it creates a Game Center activity image, so an agent must infer the action and resource entirely from the URL slug and the tool name. This is close to a tautology of the 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 versus the many sibling create/update/delete image tools (e.g. game_center_activity_images_update_instance, game_center_activity_localizations_create_instance). No prerequisites, no conditions, no alternatives are mentioned.

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