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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It says nothing about side effects, read-only guarantees, return behavior, failure modes, or any other runtime behavior. 'Public' is too weak to establish that the tool is safe or non-mutating.

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 single sentence is concise, but it is under-specified rather than effectively structured. It leaves all operational substance to the schema and does not earn its place as a usable description.

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 nine optional parameters, no output schema, and no annotations, this description is far too thin. It omits what the tool returns, which inputs matter, how they interact, and how this tool relates to the large set of sibling utilities.

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?

The input schema already documents all nine parameters with 100% coverage, giving a baseline of 3. However, the description itself adds no parameter meaning and does not explain which parameters are relevant to the ISO 3166-1 record or how they should be combined.

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 resource ('ISO 3166-1 record for ST') but does not state a verb or operation, so it is unclear what the tool actually does. It also fails to relate the described purpose to the nine unrelated-looking parameters, and does not distinguish the tool from its siblings.

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 guidance about when to use this tool, what conditions apply, or how it differs from alternatives like normalize-url, validate-json, or timezone. The phrase 'Public ... record' implies availability but not invocation context.

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