game_center_challenge_localizations_update_instance

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

With no annotations, the description carries the full behavioral burden. PATCH implies a partial mutation, but it discloses nothing about permissions required, whether the update is reversible, merge vs replace semantics, or side effects on related resources. The duplicated path adds no behavioral context.

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 description is short but wastes space by literally duplicating the method and path phrase twice, and it defers the entire body definition to an external OpenAPI schema rather than front-loading anything useful.

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 required nested JSON:API body, no annotations, and no output schema, this is insufficient. It never describes what fields can be updated or what the request envelope should contain, relying entirely on an external spec an agent may not have access to.

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 the schema already documents both parameters. The description adds no meaning beyond restating the body schema reference that the schema itself already contains, so the baseline of 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 states the HTTP verb (PATCH) and the resource path (gameCenterChallengeLocalizations/{id}), which together imply an update to a challenge localization. However, it offers no plain-language statement of purpose and nothing that distinguishes it from the create/get/delete siblings in the same family.

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 conditions, and no mention of alternatives such as the create_instance or get_instance siblings. The only extra information is a pointer to the request body schema, which is not usage guidance.

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