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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds one genuine behavioral fact, the cap of 10 results, but nothing about rate limits, auth, or result shape. A concrete but modest addition on top of the annotations.

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-loads the capability sentence, then parameters, then the routing hint — a logical order. The parameter clauses duplicate the schema text, which is mildly redundant, but the whole entry is short and every sentence is functional.

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?

An output schema exists, so return-value explanation is unnecessary, and all three parameters are documented. For a simple read-only autocomplete endpoint the description is sufficient, though it could note that an empty/invalid prefix behaves poorly, which is the main practical risk.

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%, with Term, Country and Lang each documented in the schema. The description largely restates the Country and Lang descriptions verbatim (ISO-2/ISO-639, defaults), adding no format or constraint detail beyond the schema. Baseline 3 is correct when the schema does the heavy lifting.

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 and resource ('Returns up to 10 suggestions for a search term') and names the sibling it is not, googleplay_search. Combined with the schema's 'Partial search prefix to autocomplete', an agent can immediately tell this is the autocomplete endpoint distinct from full search.

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?

Explicitly routes the agent to googleplay_search when full search is intended, which gives clear context. It doesn't spell out the inverse condition (use suggest when you only have a partial prefix), but that is strongly implied by the sibling names and the schema description.

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