game_center_activities_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 disclosure burden. 'PATCH' implies a partial mutation, but the description says nothing about required permissions, whether unspecified fields are preserved, side effects on releases or localized versions, or reversibility. Worse, it defers the body semantics to an external OpenAPI component (components.schemas.GameCenterActivityUpdateRequest) that the agent may not have access to.

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 exact same route string with zero added information, and the second sentence outsources the real content to a spec reference rather than stating it.

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 JSON:API body, no output schema, and no annotations, the description is far too thin: no updatable field list, no envelope/relationship structure, no response behavior. Pointing at an external schema definition is not a substitute for describing the operation in-band.

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 baseline is 3. The description only names the external request schema for the body parameter; it adds no field-level meaning, no required-field guidance, and no JSON:API envelope structure beyond what the schema already states.

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 is essentially an HTTP route echo of the tool name ('PATCH /v1/gameCenterActivities/{id}'), repeated verbatim in parentheses. It conveys no information about what updating a Game Center activity actually means or what aspects of the activity can be changed, and it does nothing to distinguish this from near-name siblings such as game_center_activity_versions_update_instance or game_center_achievements_update_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 when-to-use, when-not-to-use, or alternative-tool guidance at all. An agent must infer from the name alone that this mutates an existing activity rather than creating, deleting, or updating a version of one.

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