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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and network scope are covered. The description adds useful content-scope detail (the carousels and lists the home page surfaces), but says nothing about auth, rate limits, or paging beyond what the output schema likely carries.

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 scope ('worldwide or for one city') and the returned sections are packed in compactly. It earns its length, though a closing colon-list is slightly dense.

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 explained, and the description covers scope and contents. For a read-only browse tool this is nearly complete; only sibling routing is missing.

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 coverage is 100%, so the schema already documents lang, city_id, and country with defaults. The description's 'worldwide or for one city' mildly reinforces the city_id semantics already stated in the schema, but adds no new syntax or format detail. 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?

The description names a specific resource — the Apple Guides home page — and enumerates its contents (featured guide, carousels, city shortcuts, publisher list), so an agent knows exactly what it returns. It does not, however, distinguish itself from closely named siblings like apple_maps_guides_cities, apple_maps_guides_lookup, or apple_maps_guides_nearby.

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 phrase 'worldwide or for one city' implies the city_id/no-city_id usage split, giving some context. But it names no alternatives and states no explicit when-to-use/when-not conditions relative to the many sibling guides tools.

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