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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds essentially no behavioral context beyond the resource name – no auth requirements, rate limits, or what the returned landing page contains. The useful 400-error caveat about watch+arcade lives in the schema, not the 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 wasted words. It is efficiently sized, though the parenthetical is doing most of the descriptive work.

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?

An output schema exists, so return values need not be described, and the schema fully documents all four parameters. The description is minimally adequate but omits routing guidance relative to the many appstore siblings, leaving the agent to infer when this tool is the right choice.

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%, with each parameter documented (including allowed Device values and the arcade 400 caveat), so a baseline of 3 applies. The description only restates the per-device and Arcade concepts already present in the schema and adds no syntax or format detail.

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 states the resource ('Apple App Store editorial landing pages') and its two variants (per-device Today/Discover/Apps & Games page, or that device's Apple Arcade page), which is specific enough to understand the tool. It does not, however, differentiate from siblings like appstore_editorial_category, appstore_collection, or appstore_collections, nor does it use a clear verb.

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 explicit when-to-use guidance and no mention of alternatives such as appstore_editorial_category or appstore_collection. Usage can only be inferred from the noun phrase describing the resource.

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