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

Annotations already cover the safety profile (readOnly, non-destructive, open-world), and the description goes beyond them with genuinely useful operational context: the US proxy default exists to clear Google's consent wall, an EU proxy will hit that wall, and calls are billed per API request. The note about listing plugins and keeping max_results modest is slightly off-target since this tool has no max_results parameter.

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?

Front-loaded with the outcome, then identifiers, then the proxy caveat and cost note — the ordering matches how an agent needs the information. The field enumeration is long but justified given there is no output schema; the trailing billing sentence drifts into plugin-specific concerns that do not belong to this call.

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 7 optional parameters, no output schema, and no required fields, the description does the heavy lifting well: it lists return fields, explains identifier precedence, and warns about proxy country and billing. Gaps are minor — no guidance on what happens when multiple identifiers are supplied, and none on failure modes for an invalid or unresolvable place.

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, but the description adds real value by grouping the three mutually substitutable identifier parameters and framing the tool as location-neutral with feature_id resolving the place directly. It omits any elaboration on gl, hl, and raw, which the schema already covers adequately.

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?

Opens with a specific verb+resource+scope: 'Returns the full data for one Google Maps place as JSON', then enumerates exactly which fields come back. That enumeration plus the identifier options makes it unmistakable versus search-oriented siblings like google_local or google_search, even though no sibling is named explicitly.

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 clearly says how to invoke it (place_id, url, or raw feature_id) and that it is location-neutral, which implies the correct usage pattern: resolve a place elsewhere, then fetch details here. But it never states when to prefer this over google_local or google_search, nor what to do if you only have a name — the usage guidance is implied rather than explicit.

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