game_center_challenges_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, and it largely fails. The only behavioral hint is that PATCH implies a partial update; it says nothing about required permissions, what fields can be changed, side effects, or reversibility.

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 single sentence needlessly duplicates the same route string twice ('PATCH /v1/gameCenterChallenges/{id} (PATCH /v1/gameCenterChallenges/{id})'), which is pure waste, and the remaining content is a bare schema pointer rather than front-loaded task information.

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 endpoint with a nested body object, no annotations, and no output schema, the description is too thin: it defers the entire body contract to an external OpenAPI component that the agent may not have, and explains nothing about the update's effect or scope.

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 both parameters (id, body) are already documented, giving a baseline of 3. The description adds only a pointer to components.schemas.GameCenterChallengeUpdateRequest for the body envelope, which is a marginal addition over the schema's own reference.

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 a specific verb and resource (PATCH /v1/gameCenterChallenges/{id}), so the operation is identifiable. However, it is essentially a restatement of the tool name and HTTP route, and it does nothing to distinguish this update tool from the many sibling game_center_challenges_* tools (create/get/delete, leaderboard_update, versions).

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 alternatives such as game_center_challenges_create_instance or the relationship-update variants. No preconditions, no exclusions, nothing that routes the agent.

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