game_center_achievements_v2_create_instance

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

With no annotations, the description carries the full behavioral burden, yet it only implies a create via the POST route. It does not disclose required auth/roles, side effects, idempotency, validation failure behavior, or success response semantics — all of which matter for a mutating endpoint.

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 path '(POST /v2/gameCenterAchievements)' is duplicated inside parentheses, and the only substantive content is a schema pointer. Space is spent on redundancy rather than front-loading useful 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 mutating create tool with a nested JSON:API body, no annotations, and no output schema, the description is far too thin. It never describes the envelope, required attributes/relationships, or the result, leaving the agent dependent on an external OpenAPI reference it may not have.

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?

The single 'body' parameter has 100% schema description coverage, so the baseline is 3. The description merely repeats the schema's own pointer to components.schemas.GameCenterAchievementV2CreateRequest, adding no envelope, required-field, or relationship detail beyond what the schema already states.

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 a restatement of the tool name as an HTTP route: 'POST /v2/gameCenterAchievements' repeated verbatim. It names a verb and resource only in URL form and does not explain what creating a Game Center achievement v2 instance actually means or how it differs from the many sibling create/update/delete tools for the same resource family.

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 precondition, and no mention of alternatives such as game_center_achievements_create_instance (v1) or the v2 update/delete siblings. An agent gets no signal about when this specific endpoint is the right choice.

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