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

Beyond the readOnly/idempotent annotations, it discloses return shape (`external` with `source`, `num_verified` with average/count/distribution), the exclusion of comped or partnered guests, the 5-rating publication threshold with nulls and a `note` explaining why, and a mandatory `attribution` display requirement. That is substantial behavioral context annotations alone would not convey.

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?

The critical fact — a summary only, with no review text or identities — is front-loaded, and the detail that follows is largely load-bearing (threshold, null behavior, attribution mandate). The parenthetical free-tier note is slightly redundant but minor.

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 carries the full burden of explaining return values, and it does so thoroughly — both returned objects, their fields, edge cases, and the display obligation. Nothing an agent needs to call and correctly present results 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?

There is a single parameter with 100% schema description coverage ('From search_places, place_details or directory_feed'), so the schema already carries the semantics. The description adds no further meaning about place_id, making the baseline 3 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 verb+resource ('A rating SUMMARY for one place') and draws a sharp boundary by stating it returns no review text and no reviewer identities. It implicitly differentiates itself from richer siblings like place_details, but never names an alternative tool, so sibling differentiation is left to inference.

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?

Usage context is implied: it is free/included in the no-fee tier, which hints it should be preferred when only aggregate ratings are needed. However, there is no explicit when-to-use statement, no when-not-to-use, and no named alternative (e.g. place_details) to route the agent.

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