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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds minimal context by saying this is location data and that address lookup uses zipcode/CEP BR, but it does not explain outputs, validation behavior, or why three actions appear in a flattened tool. No contradiction with annotations was found.

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 description is very short and front-loaded with the general purpose, which is good, but the '[Flattened action: address]' fragment is cryptic and does not earn its place. The compactness helps, but the ambiguity of listing multiple actions in a single flattened tool prevents a higher score.

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?

Given three optional parameters, zero schema descriptions, no output schema, and sibling tools for country/states, the description is not complete enough. It fails to clarify the account parameter, the exact selection mechanism for list/states/address, or how this tool differs from guru_countries_list and guru_countries_states.

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%, so the description must compensate. It gives partial meaning for country ('ex.: BR') and zipcode ('CEP BR'), but it does not explain the 'account' parameter at all, nor how action selection maps to parameters. The agent is left guessing which parameter to provide for which outcome.

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 says it provides 'auxiliary location data' and lists three actions (list, states, address), but it does not clearly state which action this tool performs. The tool name and '[Flattened action: address]' hint at address lookup, yet the description concurrently advertises country/states actions, creating ambiguity and failing to distinguish from siblings like guru_countries_list and guru_countries_states.

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?

There is no explicit guidance on when to use this tool versus the sibling tools. The sibling list includes guru_countries_list and guru_countries_states, but the description never tells an agent to use those for country/states instead, or to use this tool only for address/CEP lookup. The usage context is only implied by action labels, not stated.

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