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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description adds genuinely useful context beyond that, notably the 10-credit cost and the pagination mechanism. It does not describe the shape or volume of returned reviews, but with no output schema that is a minor gap.

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 dense sentence front-loads the purpose, then chains identifiers, sort options, pagination, and cost with no filler. Efficient, though the run-on form makes the cost note easy to miss.

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 7-parameter tool with zero schema descriptions, no output schema, and no required parameters, the description covers the essential path but leaves gl/hl semantics and identifier-selection rules undefined. An agent can likely call it, but not confidently for localization or missing-identifier cases.

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 0% across 7 parameters, so the description must compensate. It explains cid/fid/placeId as alternate place identifiers, enumerates sortBy values, and covers nextPageToken, but leaves gl and hl completely undefined and never states whether an identifier is mandatory.

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?

Names a specific verb+resource (reviews of a place from Google Maps) and identifies the accepted identifier types, which clearly distinguishes it from siblings like googleSearch or extractStructuredData. It stops short of naming a sibling to defer to, but the purpose is unambiguous.

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?

States where the required identifiers come from ('in a googleSearch places or maps result') and how to continue results via nextPageToken, plus the valid sortBy options. There is no explicit when-not guidance or statement of which identifier to prefer when several are available.

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