game_center_activity_localizations_create_instance

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

No annotations are supplied, so the description carries the full behavioral burden, and it discloses essentially nothing beyond the HTTP method: no auth requirements, no parent-relationship prerequisites, no side effects, no confirmation of what entity is created. The only added pointer is the request schema name, which is structural rather than behavioral.

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 with the method and path, but the path is needlessly repeated in parentheses and the 'see OpenAPI ...' pointer duplicates what the schema field already says. Size is acceptable; the redundancy keeps it from being efficient.

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 create tool wrapping a nested JSON:API envelope with no annotations and no output schema, the description omits critical context: what a localization is, how it relates to its parent activity version, and what the envelope must contain. It is insufficient for correct invocation.

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 sole body parameter is documented in-schema as pointing to GameCenterActivityLocalizationCreateRequest. The description repeats that same schema reference without adding syntax, required-field, or envelope details, 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 does little more than restate the tool name as an HTTP verb plus path ('POST /v1/gameCenterActivityLocalizations'), with the path even duplicated. A reader can infer it creates an activity localization, but no statement explains what such a localization is or distinguishes it from the many sibling create_instance tools. This is tautological restatement rather than a clear purpose statement.

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 call this versus the numerous alternative creators (game_center_activity_localizations_get_instance, update_instance, delete_instance, or the various game_center_*_localizations create tools). No prerequisites, no conditions, no exclusions are given.

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