subscription_group_localizations_v2_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 behavioral burden, yet it discloses nothing about authentication/scope requirements, side effects, or what the response contains. Its one useful disclosure is that the body must follow the JSON:API envelope defined by components.schemas.SubscriptionGroupLocalizationV2CreateRequest, which is a genuine hint about request shape but far short of what a mutation tool with zero annotations needs.

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-loaded, which is good, but the parenthetical duplicates the route verbatim ('(POST /v2/subscriptionGroupLocalizations)') and consumes space without adding information. The remaining sentence is useful but the whole thing is a single sentence of low density.

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 no output schema and no annotations, the description must at minimum tell an agent how to build a valid request. The body is a nested object with additionalProperties: {}, and the only guidance is 'see OpenAPI components.schemas...' — an external pointer the agent may not be able to resolve. Nothing about required JSON:API attributes, relationships, or success behavior is included, leaving a significant gap for a create operation.

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?

There is a single 'body' parameter and the schema description already covers it at 100% by pointing to the same component schema. The description simply repeats that pointer, adding no new semantics (no field-level detail, no required relationships). Baseline 3 applies because the schema is doing the documentation work.

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 restates the route and the tool name ('POST /v2/subscriptionGroupLocalizations') rather than saying what a subscription group localization is or what creating one accomplishes. The verb 'create' is only inferable from the tool name, not stated as intent, and nothing distinguishes it from the many sibling *_create_instance tools. This is close to a tautology of the identifier.

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 mention of prerequisites, and no differentiation from alternatives such as subscription_group_localizations_create_instance (the v1 variant) or subscription_group_localizations_v2_get_instance/update_instance. The only implicit signal is that a POST endpoint means creation.

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