Update app name and subtitle

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

Annotations already declare this is a non-destructive, idempotent, open-world write operation. The description adds meaningful behavioral context beyond annotations: only supplied fields change, and the locale is created if absent. It does not mention permissions or error behavior, but the annotations lower the disclosure burden.

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?

Two tightly written sentences with no wasted language. The core action is front-loaded and the key update semantics follow immediately.

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 seven-parameter mutation tool with full schema coverage, no output schema, and annotations covering safety, the description provides sufficient context about partial updates and locale creation. A little more guidance on choosing among app info records would make it fully complete, but that is partly covered by the appInfoId schema description.

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 seven parameters are already documented in the schema. The description reinforces partial update semantics but does not add syntax, format, or selection guidance beyond what the schema provides; baseline 3 is appropriate.

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?

States a specific verb and resource: setting an app's name, subtitle, or privacy URLs for one locale on its editable App Store info record. This clearly distinguishes the operation from version-localization tools and makes the target record explicit.

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 description explains partial-update behavior and that the locale will be added if missing, which implies when the tool is appropriate. However, it does not explicitly contrast this tool with nearby alternatives such as update_version_localization or explain when not to use it.

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