set_iap_localization

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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the description should add what those mean here (does an update overwrite existing name/description? is a missing locale created silently?). It adds nothing beyond the bare 'create or update' framing, which is restated by the schema's localizationId parameter description.

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?

A single front-loaded sentence with no filler; the purpose is stated before anything else and nothing redundant is included.

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 destructive, non-idempotent mutation with five parameters the description gives no behavior on overwrite semantics, locale conflicts, or required scopes, and there is no output schema to fill the gap. Only the annotations keep this from being unusable.

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%, including the key detail that localizationId switches update-vs-create, so the schema carries the semantic load. The description adds no parameter meaning beyond that baseline.

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?

Clear verb+resource: "Create or update a localization for an in-app purchase" tells an agent exactly what the tool mutates. It does not differentiate itself from near-identical siblings such as set_subscription_localization or set_beta_build_localization, so the agent must infer the target object from the name alone.

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?

No guidance on when to call this versus create_iap/update_iap or set_subscription_localization, and no statement of prerequisites (e.g. IAP must already exist). The create-vs-update decision is left entirely implicit.

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