game_center_activity_localizations_update_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 idempotency, partial-vs-full update semantics, what happens to unspecified localization fields, or auth requirements. The only signal is the PATCH verb in the path, which is already derivable from the name.

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, but the sentence is wasteful: the endpoint is duplicated verbatim in parentheses instead of front-loading what the tool does. The only unique information is a reference to an external schema location.

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 mutation tool with a nested, untyped body object, no annotations, and no output schema, the description provides no field-level detail, no example envelope, and no error or permission context. Pointing to an external OpenAPI component the agent may not have access to leaves the call under-specified.

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 nominally 100%, but both schema descriptions are generic ("the id of the requested resource", "JSON body") and the body is additionalProperties:{} with only an external pointer to components.schemas.GameCenterActivityLocalizationUpdateRequest. Since the agent likely lacks that OpenAPI component, the description fails to compensate for the opaque nested payload, which lists no updatable fields (locale, name, description, image, etc.).

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 HTTP path twice verbatim ("PATCH /v1/gameCenterActivityLocalizations/{id} (PATCH /v1/gameCenterActivityLocalizations/{id})") which is essentially a tautology of the tool name plus endpoint. It implies an update to a game center activity localization, but adds no verb-level explanation of what is actually being changed or how it differs from siblings such as game_center_activity_localizations_get_instance or _delete_instance.

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 read, create, or delete siblings, no preconditions, and no mention of required permissions or parent resources. The agent is left to infer everything from the tool name alone.

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