game_center_achievement_localizations_v2_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 of behavioral disclosure. The 'GET' verb implies a read-only, non-destructive operation, which is a small amount of signal, but nothing is said about authentication requirements, pagination, sparse-fieldset behavior, or error handling for a missing id.

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 extremely short and contains no filler, but the parenthetical duplication of the same route is pure redundancy rather than concision. Brevity here reflects under-specification rather than efficient communication.

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 five-parameter endpoint with no output schema and no annotations, the description should clarify the resource type, the meaning of the id, and the purpose of include/fields_* sparse fieldsets. Instead it supplies only the raw route, leaving an agent to reconstruct everything from the schema 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%, so all five parameters (id, include, and the three fields_* sparse-fieldset params) are already documented in the schema. The description's '{id}' placeholder adds only marginal reinforcement of the path parameter. Baseline 3 applies when the schema does the heavy lifting.

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 verbatim restatement of the tool name as an HTTP route: 'GET /v2/gameCenterAchievementLocalizations/{id}'. It does convey the verb (GET) and resource (achievement localizations) and that a single instance is fetched, which distinguishes it from the create/update/delete siblings. However, it adds zero information beyond what the tool name already encodes, making it borderline tautological.

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 (e.g., the non-v2 get_instance sibling, or the get_to_many_relationship for the same resource type). The agent must infer its role purely from the name.

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