game_center_achievement_localizations_create_instance

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

With no annotations, the description must carry the full behavioral burden. It signals a POST mutation and deprecation, but says nothing about what gets created, permissions/auth needs, side effects, or reversibility. For a create-instance mutation with zero annotation coverage this is a substantial gap.

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-loads the DEPRECATED marker, but the endpoint path is needlessly printed twice ('POST /v1/gameCenterAchievementLocalizations (POST /v1/gameCenterAchievementLocalizations)'), which is pure redundancy rather than earned content.

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 create tool with a nested JSON:API body and no output schema or annotations, the description omits the most decision-relevant facts: the successor to use instead, and any auth or field requirements. Pointing to the OpenAPI schema is the only substantive help, and the schema already does that.

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 there is a single body parameter, so the schema already documents it. The description points to components.schemas.GameCenterAchievementLocalizationCreateRequest for the JSON:API envelope, which is marginally additive but largely duplicates the schema's own description. Baseline 3 applies.

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 conveys that this creates a Game Center achievement localization via the HTTP verb and resource path, and usefully flags it as DEPRECATED. However, it is essentially a restatement of the endpoint rather than a purpose statement, and it offers no differentiation from siblings like game_center_achievement_localizations_v2_create_instance or the get/update/delete variants.

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 guidance. The [DEPRECATED] tag hints the agent should prefer a successor, but the description never names the replacement (the v2 tool exists) or states any precondition. An agent gets no routing help.

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