app_store_version_localizations_create_instance

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

No annotations are provided, so the description carries full behavioral burden, yet it discloses nothing beyond the HTTP verb: no auth/permission requirements, no side effects of creation, no uniqueness or locale constraints, no error behavior. It only points at an external OpenAPI schema for the body.

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?

It is short and front-loads the endpoint, but the path is repeated verbatim within parentheses, which is pure redundancy. Two of the three clauses restate information an agent already has from the tool name.

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 nested-object create tool with no annotations and no output schema, the description is under-specified: it defers the entire body contract to an external OpenAPI reference the agent may not possess, and says nothing about the returned resource or post-creation state.

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 the schema already documents it; the description adds only the note that the body follows the JSON:API envelope via components.schemas.AppStoreVersionLocalizationCreateRequest. That is a reference, not added semantic detail, 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 essentially the HTTP path restated twice ("POST /v1/appStoreVersionLocalizations (POST /v1/appStoreVersionLocalizations)"), which is a tautology rather than a statement of purpose. The actual meaning (create a localization for an app store version) is only inferable from the tool name and the endpoint constant, not from the description.

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?

Nothing tells the agent when to use this create tool versus the sibling app_store_version_localizations_get_instance, _update_instance, _delete_instance, or the app_store_versions_app_store_version_localizations relationship tool. The only signal is the implied "create" from the name and POST verb.

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