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, and it discloses nothing: no mention of the validation rule set, country coverage, return format, or failure behavior for a validation tool.

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 text is short, but its brevity comes from under-specification rather than efficiency. The repetition of the name in title and description form wastes the only sentence available.

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 validation tool with no annotations, no output schema, and a generic 'value' parameter, the description provides none of the context needed to invoke it correctly. Nothing about accepted formats, pass/fail semantics, or error cases is present.

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 100% for the single 'value' parameter, so the schema itself documents the input. The description adds no meaning beyond that, which makes the baseline of 3 appropriate here.

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 'Is Passport: Is Passport' is a pure tautology that merely restates the tool name. It does not state what a passport is being validated against, what format is expected, or what the result means, so an agent cannot distinguish it from the many other 'is-*' validators in the sibling list.

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 whatsoever on when to use this tool, what input qualifies as a passport number, or which alternative tools to consider. The agent is left to guess entirely.

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