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 clear. The description adds the useful context that this is the flattened 'states' action and gives example inputs, but it does not describe return data, error behavior, or any operational constraints. No contradiction with annotations is present.

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 short and front-loaded, with no filler words. The compact notation and bracketed flattened-action note are somewhat cryptic, but the text earns its place and avoids redundancy.

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 simple read-only tool with no output schema, the description gives enough to guess the states lookup, but it overcomplicates the picture by listing multiple actions while only the states action is flattened here. It also omits expected return shape and the role of the account parameter, leaving the tool under-specified for an agent.

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 provides some parameter semantics: 'country, ex.: BR' clarifies the country parameter, and 'zipcode/CEP BR' clarifies the zipcode parameter. However, the 'account' parameter is left unexplained, and the action list does not map cleanly onto the three schema properties.

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 identifies the domain as 'auxiliary Guru location data' and lists list/states/address actions, but it does not state a crisp verb+resource for this specific tool. The '[Flattened action: states]' note suggests this tool is for fetching states, yet the multi-action text makes the purpose ambiguous and fails to distinguish it from sibling tools like guru_countries_list and guru_countries_address.

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?

The description gives practical examples ('country, ex.: BR', 'zipcode/CEP BR') and names the available actions, which implies when to use the tool. However, it does not explicitly say when to use this flattened states tool instead of the sibling list/address tools, nor does it specify exclusions or prerequisites.

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