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

Annotations already establish read-only and open-world behavior; the description adds value by disclosing the API key requirement, pagination flow via next_page_token, and the composition of the response. It does not discuss rate limits or error behavior, but the annotation coverage lowers the bar and the added context is useful.

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?

Three sentences, zero filler: outcome and return fields first, identifier source second, controls/auth third. Each sentence earns its place and the most important scoping information is front-loaded.

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 no output schema, the description still covers the returned data (review fields plus place_info), the required authentication, and the pagination mechanism. Combined with the very rich input schema, an agent has everything necessary to invoke the tool correctly.

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 baseline is 3; the description still adds meaning by connecting place_id/data_id to a google_maps result and summarizing sort/filter/pagination behavior. It reinforces how the parameters interact without needing to restate their schema definitions.

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 opens with a precise verb and resource: 'Return the Google Maps reviews of one place', plus place_info, and enumerates the review fields. This clearly distinguishes it from sibling search tools (google_search, google_maps) by scoping to reviews of a single place identified via a google_maps result.

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?

It tells the agent the source of identifiers ('from a google_maps result') and shows when to use the tool: after obtaining place_id or data_id, then sort, filter, or paginate. It does not explicitly state when not to use it or name alternatives, but the context is clear enough for correct selection.

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