in_app_purchases_v2_create_instance

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

No annotations are provided, so the description must carry the behavioral burden, but it only restates the HTTP method and points to an external schema. It does not disclose authentication needs, side effects, what resource is created, whether creation is idempotent, or what the response contains.

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 and front-loaded, but it contains redundant repetition of the endpoint and provides almost no information beyond a schema pointer. It is concise to the point of being under-specified rather than usefully structured.

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?

This is a nested-object mutation with no annotations and no output schema, so the description needs to explain the create behavior and body expectations more fully. Pointing to an external OpenAPI component is not enough because the referenced schema definition is not included, leaving the agent unable to understand required JSON:API envelope details from the tool definition alone.

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 the single body parameter is already documented in the schema as a JSON body matching components.schemas.InAppPurchaseV2CreateRequest. The description repeats that reference but adds no additional meaning, so the 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 exposes the HTTP operation (POST /v2/inAppPurchases) and the tool name indicates a create-instance operation, so an agent can infer this creates an in-app purchase v2 resource. However, it never states the purpose in plain language, and it does not distinguish this create tool from neighboring v2 update/delete or v1 create tools.

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 about when to use this tool, prerequisites, or alternatives such as in_app_purchases_v2_update_instance or the v1 create path. The agent must infer usage entirely from the tool name and endpoint.

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