game_center_challenges_get_instance

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

No annotations are provided, so the description carries the full burden, yet it discloses nothing beyond the read nature implied by the HTTP GET. It does not mention authentication requirements, error behavior for a missing id, what the response contains, or how the include/fields parameters affect the payload and performance.

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 very short, but the content is a REST path echoed twice, which is waste rather than conciseness. There is no front-loaded natural-language explanation of what the call does or returns.

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?

An eight-parameter endpoint with no annotations and no output schema needs the description to explain sparse fieldsets, relationship includes, and response shape. The description supplies none of that, leaving the agent to reverse-engineer the Apple App Store Connect API conventions from the parameter names alone.

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 all eight parameters (id, include, limit_versions, five fields_* sparse-fieldset params) are individually documented in the schema, so the baseline of 3 applies. The description adds no interpretation of its own — notably nothing about sparse fieldsets, which are non-obvious to an agent.

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 a raw REST path (duplicated verbatim in parentheses) that does identify the verb (GET) and the resource (a single gameCenterChallenge addressed by {id}), so an agent can infer 'fetch one challenge by id'. However, it is essentially a restatement of the tool name rather than a plain-language statement of purpose, and it draws no distinction from siblings such as game_center_challenges_versions_get_to_many_relationship or game_center_challenges_create_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, what prerequisites exist, or which sibling to prefer for related data. The only implied usage comes from the HTTP path shape (single-resource retrieval), which the agent must decode itself.

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