game_center_activities_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. It does not state auth requirements, whether the operation is idempotent, what side effects occur, or what the response contains. Its only behavioral hint is a pointer to an external OpenAPI schema for the request envelope, which is thin for a mutation tool.

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 sentence is short but wasteful: the route 'POST /v1/gameCenterActivities' is printed twice in a row inside parentheses, adding no information. Little content remains after removing the duplication.

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 write tool with no annotations, no output schema, and a free-form nested body whose real shape lives in an external OpenAPI document the agent may not have, the description is far too thin. It should at least outline the envelope or key required fields.

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 baseline 3 applies. The description's pointer to components.schemas.GameCenterActivityCreateRequest largely duplicates the schema's own description, adding no new semantic detail about the required JSON:API envelope fields.

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 HTTP route 'POST /v1/gameCenterActivities', which implies a create verb on the gameCenterActivities resource. It does not describe what a Game Center activity is or what creation entails, and it offers no differentiation from the many sibling create/update/delete activity tools. Minimum-viable rather than clarifying.

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 when-to-use guidance, no prerequisites, and no mention of alternatives such as game_center_activities_update_instance or game_center_activity_versions_create_instance. Only the POST verb hints at create semantics, which is inference rather than guidance.

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