in_app_purchase_availabilities_get_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 of behavioral disclosure. The 'GET' prefix does signal a read-only operation, but nothing is said about authentication requirements, pagination, error behavior for missing IDs, or what the included relationships do. For a 5-parameter tool with zero annotation coverage this is a substantial gap.

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 text is short but not concise in a useful sense: the same route string is repeated verbatim inside parentheses, which is pure waste. It is under-specified rather than efficiently trimmed.

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?

With 5 parameters, no annotations, no output schema, and a resource type that is not self-explanatory, the description should at minimum say what the endpoint returns and what the include/fields options surface. None of that is present, leaving the agent to infer everything from the schema 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%, so every parameter (id, include, fields_*, limit_availableTerritories) is already documented in the schema. The description contributes nothing beyond the path template's id placeholder, 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 is a raw HTTP route, 'GET /v1/inAppPurchaseAvailabilities/{id}', duplicated in parentheses. It conveys the HTTP verb and path template, which implies a single-resource fetch, but it adds no plain-language statement of what an 'in-app purchase availability' is or how it differs from sibling collection/relationship tools. This is effectively the tool name restated in URL form.

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 alternatives such as in_app_purchase_availabilities_available_territories_get_to_many_relationship or in_app_purchase_availabilities_create_instance. No prerequisites, no context, no exclusions.

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