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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe global read. The description adds that results are scoped worldwide or to a single city, but says nothing about result size, pagination, or ordering that an agent might need.

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 naming the resource, the browse mode, the scope, and the fields. Zero filler, though the field enumeration overlaps with the output schema.

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?

With annotations carrying the safety profile, an output schema carrying the return shape, and full schema coverage on all three optional params, the description supplies enough for an agent to call the tool correctly. It is only marginally short on how this differs from the singular publisher sibling.

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 lang, city_id, and country are fully documented in the schema. The description only restates the city/worldwide scoping that city_id already covers, adding no new syntax or constraint detail, so the 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?

States a specific verb+resource (publisher list / Browse by Publisher) and enumerates the returned fields, so the agent knows exactly what it gets. It does not explicitly distinguish itself from the sibling apple_maps_guides_publisher or apple_maps_guides_lookup, but the plural 'list' framing makes the browse-vs-detail distinction reasonably clear.

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 '(Browse by Publisher)' and 'worldwide or for one city' phrasing implies the browsing context, but there is no explicit statement of when to prefer this over apple_maps_guides_publisher, apple_maps_guides_cities, or apple_maps_guides_nearby. Usage is inferable rather than spelled out.

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