game_center_achievement_images_get_instance

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

With no annotations at all, the description must carry the behavioral burden, and it only discloses deprecation. That flag is genuinely valuable (an agent should avoid building on this endpoint), but it says nothing about auth requirements, whether it returns an expired/empty payload, or how deprecation manifests at call time.

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?

Extremely short and the deprecation warning is front-loaded, which is the right priority. The only waste is the redundant path repeated verbatim in parentheses, which conveys nothing the first occurrence did not.

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 simple single-resource GET with full schema coverage and no output schema, the definition is minimally sufficient: the agent knows the resource, the required id, and that it is deprecated. It stops short of explaining the returned representation or the include/fields trade-offs, but the schema covers the inputs.

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 id, include, and fields_* parameters are documented in the schema itself with enums listed. The description adds no additional meaning beyond the schema baseline, which is acceptable but not additive.

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 restated HTTP route (GET /v1/gameCenterAchievementImages/{id}) rather than a natural-language statement of purpose. The resource and the single-resource scope are identifiable from the path, but an agent gets no prose explanation of what a game center achievement image record actually is.

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?

The '[DEPRECATED]' prefix is a useful steer away from the tool, but no replacement is named and no condition for legitimate use is given. The sibling list contains near-duplicates (game_center_achievement_images_v2_get_instance, ..._v2_image_get_to_one_related) and the description never routes the agent between them.

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